Pub Date : 2023-08-30DOI: 10.1177/09540083231199766
Yuxia Zhang, Haojie Liu, Menghan Liu, Xiaofan Ma, Haifeng Shi
The utilization of functionalized graphene oxide as nanofillers has attracted significant attention in the development of high-performance composite materials. In this study, amine-functionalized graphene oxide (AFGO) by different amines, including p-phenylenediamine- (PPD-GO) and 4, 4’-diaminodiphenyl ether (ODA-GO), respectively, was prepared and used to synthesize a series of polyimide (PI) composite membranes via in situ polymerization method. The PPD-GO/PI and ODA-GO/PI composite membranes exhibited much higher mechanical and thermal properties than that of neat PI, owing to the diverse interfacial interaction and the surface architecture behavior. Compared to neat PI, the tensile strengths were enhanced 14.6% and 14.5%, the tensile modulus were enhanced 26.9% and 23.2%, and the Tg increased by 9°C and 17.5°C of the PI composite membrane containing 0.3 wt% PPD-GO or ODA-GO, respectively. This study provides a guidance for the development of high-performance PI composite materials through the regulated interfacial structure via the moderate chain length.
{"title":"Effects of different amine-functionalized graphene oxide on the mechanical and thermal properties of polyimide composites","authors":"Yuxia Zhang, Haojie Liu, Menghan Liu, Xiaofan Ma, Haifeng Shi","doi":"10.1177/09540083231199766","DOIUrl":"https://doi.org/10.1177/09540083231199766","url":null,"abstract":"The utilization of functionalized graphene oxide as nanofillers has attracted significant attention in the development of high-performance composite materials. In this study, amine-functionalized graphene oxide (AFGO) by different amines, including p-phenylenediamine- (PPD-GO) and 4, 4’-diaminodiphenyl ether (ODA-GO), respectively, was prepared and used to synthesize a series of polyimide (PI) composite membranes via in situ polymerization method. The PPD-GO/PI and ODA-GO/PI composite membranes exhibited much higher mechanical and thermal properties than that of neat PI, owing to the diverse interfacial interaction and the surface architecture behavior. Compared to neat PI, the tensile strengths were enhanced 14.6% and 14.5%, the tensile modulus were enhanced 26.9% and 23.2%, and the Tg increased by 9°C and 17.5°C of the PI composite membrane containing 0.3 wt% PPD-GO or ODA-GO, respectively. This study provides a guidance for the development of high-performance PI composite materials through the regulated interfacial structure via the moderate chain length.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42062078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.
{"title":"Structure and properties of thermoplastic polyimide based on 4′, 4′—(Oxybis (methylene)) bis ([1.1′- bipheny]3-amine) diamine","authors":"Jinshui Lu, Jinyuan Zhang, Heng Liu, Wei-Peng Chen, Jiangrong Luo, Ziqing Wang, Tingting Cui, Yonggang Min, Yidong Liu","doi":"10.1177/09540083231191416","DOIUrl":"https://doi.org/10.1177/09540083231191416","url":null,"abstract":"In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45006256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-16DOI: 10.1177/09540083231196087
S. Singh, B. Nayak, T. J. Singh, S. Halder
In the current study, graphite was exfoliated using a Hummer’s technique to produce graphene oxide (GO), which was then reduced with hydrazine hydrate (a reducing agent) to produce reduced graphene oxide (rGO) with high purity. The XRD, FT-IR, SEM, and TGA analysis confirmed the synthesis of rGO by stating its crystal phase, chemical functional group, morphology, and thermal stability. The objective of this study is twofold: firstly, to synthesize the reduced graphene oxide (rGO) cost-effectively, and secondly, to explore its potential as an additional filler in Glass Fiber Reinforced Polymer (GFRP) composites. Aiming to enhance their overall performance. The GFRP laminate composite was fabricated through the hand layup technique by varying the concentration of Gr (i.e., 0.5 wt% & 1 wt%) and rGO (i.e., 0.5 wt% & 1 wt%). The morphological study of the fracture surface revealed a proper dispersion of filler obtained at 0.5 wt% and by increasing the concentration to 1 wt% it reveals a clustering of fillers and formation of micro-voids. The result revealed that maximum improvement has been observed in the GFRP composite having 0.5 wt% rGO composite than neat GFRP composite. Incorporation of rGO micro-filler in GFRP laminate composite significantly improved the tensile strength, flexural strength, and in their modulus by 59.56%, 18.21%, 24.45%, and 22.75% respectively compared to neat GFRP laminate composite. In the case of 0.5 wt% graphite filler demonstrates an enhancement in tensile strength, flexural strength, and their modulus by 37.98%, ∼8%, 6.64%, and ∼5% respectively. In fretting wear test reveals that 1 wt% of graphite filler has better wear resistance than all other composites. The worn morphology revealed adhesive and abrasive wear as the predominant wear mechanism. The incorporation of rGO filler in GFRP makes it a promising material for industrial applications that demand high strength and superior wear resistance.
{"title":"Investigating the role of synthesized reduced graphene oxide and graphite micro-fillers on mechanical and fretting wear performance of glass fiber epoxy-based composite","authors":"S. Singh, B. Nayak, T. J. Singh, S. Halder","doi":"10.1177/09540083231196087","DOIUrl":"https://doi.org/10.1177/09540083231196087","url":null,"abstract":"In the current study, graphite was exfoliated using a Hummer’s technique to produce graphene oxide (GO), which was then reduced with hydrazine hydrate (a reducing agent) to produce reduced graphene oxide (rGO) with high purity. The XRD, FT-IR, SEM, and TGA analysis confirmed the synthesis of rGO by stating its crystal phase, chemical functional group, morphology, and thermal stability. The objective of this study is twofold: firstly, to synthesize the reduced graphene oxide (rGO) cost-effectively, and secondly, to explore its potential as an additional filler in Glass Fiber Reinforced Polymer (GFRP) composites. Aiming to enhance their overall performance. The GFRP laminate composite was fabricated through the hand layup technique by varying the concentration of Gr (i.e., 0.5 wt% & 1 wt%) and rGO (i.e., 0.5 wt% & 1 wt%). The morphological study of the fracture surface revealed a proper dispersion of filler obtained at 0.5 wt% and by increasing the concentration to 1 wt% it reveals a clustering of fillers and formation of micro-voids. The result revealed that maximum improvement has been observed in the GFRP composite having 0.5 wt% rGO composite than neat GFRP composite. Incorporation of rGO micro-filler in GFRP laminate composite significantly improved the tensile strength, flexural strength, and in their modulus by 59.56%, 18.21%, 24.45%, and 22.75% respectively compared to neat GFRP laminate composite. In the case of 0.5 wt% graphite filler demonstrates an enhancement in tensile strength, flexural strength, and their modulus by 37.98%, ∼8%, 6.64%, and ∼5% respectively. In fretting wear test reveals that 1 wt% of graphite filler has better wear resistance than all other composites. The worn morphology revealed adhesive and abrasive wear as the predominant wear mechanism. The incorporation of rGO filler in GFRP makes it a promising material for industrial applications that demand high strength and superior wear resistance.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41852181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-16DOI: 10.1177/09540083231195524
Hengyang Liu, B. Liang, Jiapeng Long
In this study, the intermediate of SPDPC flame retardant curing agent was successfully synthesized through the reaction between phosphorus oxychloride and pentaerythritol under the catalysis of 4-dimethylaminopyridine. Using 1,2-propylenediamine and the prepared SPDPC, a novel phosphorus and nitrogen flame retardant curing agent named poly1,2-propylenediamine pentaerythritol diphosphate (PDS) was successfully synthesized. The target product was subjected to characterization using infrared spectroscopy, mass spectrometry, hydrogen NMR spectroscopy and thermogravimetric analysis. The molecular structure of the product was determined and its decomposition temperature curve obtained, leading to the conclusion that it could be cured at high temperatures. DDS was selected as the curing agent for epoxy E-51, the specific curing conditions were obtained by DSC test. Subsequently, E-51, DDS and PDS were mixed for high temperature curing resulting in obtaining test spline of PDS-E-51 flame retardant composite material. Then, the flame retardancy and mechanical properties of the spline were tested. It was observed that pure EP cured by DDS had an LOI of only 19.5%, indicating its flammability. However, upon addition of PDS as a flame retardant, the LOI significantly increased with 20 parts resulting in an LOI of 29.7%. The addition of 25 parts results in an increase in limiting oxygen index to 30.3%, while the tensile strength and impact strength are measured at 38.27 MPa and 5.087 kJ/m2 respectively. The CCT test shows that the addition of PDS can significantly reduce the HHR and THR of the system. CCT digital photos show that the addition of PDS can make the combustion residue of the system expand obviously, showing a good expansion and flame retardant effect. TG-FTIR gas phase infrared absorption indicates that the addition of PDS can reduce the concentration of combustible gas in the combustion process. Test results indicate that the mechanical properties of PDS-E-51 flame retardant composites experience a certain degree of decline, but with increasing amounts of PDS curing agent added, their flame retardancy is significantly enhanced.
{"title":"Synthesis and application of halogen-free epoxy resin flame retardant curing agent","authors":"Hengyang Liu, B. Liang, Jiapeng Long","doi":"10.1177/09540083231195524","DOIUrl":"https://doi.org/10.1177/09540083231195524","url":null,"abstract":"In this study, the intermediate of SPDPC flame retardant curing agent was successfully synthesized through the reaction between phosphorus oxychloride and pentaerythritol under the catalysis of 4-dimethylaminopyridine. Using 1,2-propylenediamine and the prepared SPDPC, a novel phosphorus and nitrogen flame retardant curing agent named poly1,2-propylenediamine pentaerythritol diphosphate (PDS) was successfully synthesized. The target product was subjected to characterization using infrared spectroscopy, mass spectrometry, hydrogen NMR spectroscopy and thermogravimetric analysis. The molecular structure of the product was determined and its decomposition temperature curve obtained, leading to the conclusion that it could be cured at high temperatures. DDS was selected as the curing agent for epoxy E-51, the specific curing conditions were obtained by DSC test. Subsequently, E-51, DDS and PDS were mixed for high temperature curing resulting in obtaining test spline of PDS-E-51 flame retardant composite material. Then, the flame retardancy and mechanical properties of the spline were tested. It was observed that pure EP cured by DDS had an LOI of only 19.5%, indicating its flammability. However, upon addition of PDS as a flame retardant, the LOI significantly increased with 20 parts resulting in an LOI of 29.7%. The addition of 25 parts results in an increase in limiting oxygen index to 30.3%, while the tensile strength and impact strength are measured at 38.27 MPa and 5.087 kJ/m2 respectively. The CCT test shows that the addition of PDS can significantly reduce the HHR and THR of the system. CCT digital photos show that the addition of PDS can make the combustion residue of the system expand obviously, showing a good expansion and flame retardant effect. TG-FTIR gas phase infrared absorption indicates that the addition of PDS can reduce the concentration of combustible gas in the combustion process. Test results indicate that the mechanical properties of PDS-E-51 flame retardant composites experience a certain degree of decline, but with increasing amounts of PDS curing agent added, their flame retardancy is significantly enhanced.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41774864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-10DOI: 10.1177/09540083231184559
Gang Xu, Liyun Tan, Y. Nie, Xingzhong Fang, Guofei Chen
Reactive polyimide (PI) containing phenolic hydroxyl groups was prepared by the polymerization of 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoropropane and mixed thiodiphthalic anhydride. A series of epoxy resin composites were obtained by adding reactive PI to N,N,N′,N′-tetraglycidyl-4,4′-diamino-diphenylmethane (TGDDM) epoxy resin in different proportions. The effect of PI content on curing behavior, thermal properties, and mechanical properties was carefully investigated. Even a small amount of PI addition improved the mechanical properties and heat resistance of the epoxy resin, particularly the fracture toughness. Among them, epoxy resin composites EP-PI-1.5 with the addition of 1.5 wt% PI showed the best mechanical properties, whose impact strength, fracture toughness, and tensile strength were increased by 114%, 59%, and 34%, respectively. The phase morphology was also investigated to illustrate the fracture mechanism by scanning electron microscope (SEM) characterization.
{"title":"Synthesis and characterization of epoxy resin composites modified by reactive polyimide containing hydroxyl groups","authors":"Gang Xu, Liyun Tan, Y. Nie, Xingzhong Fang, Guofei Chen","doi":"10.1177/09540083231184559","DOIUrl":"https://doi.org/10.1177/09540083231184559","url":null,"abstract":"Reactive polyimide (PI) containing phenolic hydroxyl groups was prepared by the polymerization of 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoropropane and mixed thiodiphthalic anhydride. A series of epoxy resin composites were obtained by adding reactive PI to N,N,N′,N′-tetraglycidyl-4,4′-diamino-diphenylmethane (TGDDM) epoxy resin in different proportions. The effect of PI content on curing behavior, thermal properties, and mechanical properties was carefully investigated. Even a small amount of PI addition improved the mechanical properties and heat resistance of the epoxy resin, particularly the fracture toughness. Among them, epoxy resin composites EP-PI-1.5 with the addition of 1.5 wt% PI showed the best mechanical properties, whose impact strength, fracture toughness, and tensile strength were increased by 114%, 59%, and 34%, respectively. The phase morphology was also investigated to illustrate the fracture mechanism by scanning electron microscope (SEM) characterization.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48831320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To gain insight into more about how flame retardants containing phosphorus, sulfur, and nitrogen affect epoxy resin (EPs), a multicomponent flame retardant (Sp-ACDH) containing P/N/S was synthesized from sodium p-aminobenzene sulfonate (Sp-A), cinnamaldehyde and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and applied to epoxy resin. Sp-ACDH enables the epoxy resin to achieve the desired flame retardancy. For example, with the addition of 10 wt% Sp-ACDH, the epoxy composite passed the UL-94 V-0 rating and achieved an LOI of 32.7%. Additionally, Sp-ACDH effectively slowed down EP’s ability to release heat, with EP-15 Sp-ACDH exhibiting a peak heat release rate (PHRR) that was 680 kW/m2 rather than pure EP’s 1204.4 kW/m2. Eventually, the samples were characterized using Scanning electron microscopy (SEM), Raman spectroscopy, and Thermogravimetric analysis-fourier transform infrared spectroscopy (TG-FTIR) spectra, and the samples were analyzed, it revealed that Sp-ACDH’s flame-retardant properties were active in both the gas and condensed phases.
{"title":"A novel multi-element flame retardant containing phosphorus, nitrogen and sulfur for enhancing the fire safety of epoxy resin composites","authors":"Junwei Li, Quanyi Liu, Yumei Zhou, Yuming Cai, Kaikai Shi, Haihan Zhao, Yawei Meng, Penglun Zheng","doi":"10.1177/09540083231194706","DOIUrl":"https://doi.org/10.1177/09540083231194706","url":null,"abstract":"To gain insight into more about how flame retardants containing phosphorus, sulfur, and nitrogen affect epoxy resin (EPs), a multicomponent flame retardant (Sp-ACDH) containing P/N/S was synthesized from sodium p-aminobenzene sulfonate (Sp-A), cinnamaldehyde and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and applied to epoxy resin. Sp-ACDH enables the epoxy resin to achieve the desired flame retardancy. For example, with the addition of 10 wt% Sp-ACDH, the epoxy composite passed the UL-94 V-0 rating and achieved an LOI of 32.7%. Additionally, Sp-ACDH effectively slowed down EP’s ability to release heat, with EP-15 Sp-ACDH exhibiting a peak heat release rate (PHRR) that was 680 kW/m2 rather than pure EP’s 1204.4 kW/m2. Eventually, the samples were characterized using Scanning electron microscopy (SEM), Raman spectroscopy, and Thermogravimetric analysis-fourier transform infrared spectroscopy (TG-FTIR) spectra, and the samples were analyzed, it revealed that Sp-ACDH’s flame-retardant properties were active in both the gas and condensed phases.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49513151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-08DOI: 10.1177/09540083231183099
X. Xiong, Donghui Liu, R. Ren, Jing Wang
Four novel phthalonitrile-capped polyarylene ether nitrile oligomers containing trifluoromethyl groups (FPEN-Ph) with different molecular weight were designed and synthesized by adjusting the ratio of bisphenol AF (BPAF) and 2,6-dicholorobenzonitrile (DCBN). The molecular structure of FPEN-Ph oligomers were characterized and analyzed by FTIR, 1HNMR and Gel permeation chromatography. Their curing behaviors were studied by Differential scanning calorimetry and rheological tests, and curing kinetics were also discussed by gel method in detail. The glass fiber cloth reinforced FPEN-Ph composites (FPEN-Ph/GF) had flexural strengths of 415.9–497.5 MPa, shear strengths of 34.5–50.5 MPa, and glass transition temperatures ( Tgs) in the range of 211.3°C–416.6°C. The initial thermal decomposition temperatures ( T5%) of various FPEN-Ph cured products were higher than 500°C under nitrogen. Meanwhile, Fracture morphologies showed that the GF/FPEN-Ph composites had excellent interfacial adhesion between FPEN-Ph matrix and GF reinforcement. Herein, the FPEN-Ph resin could be a good candidate for high-performance polymeric composites and the advanced FPEN-Ph/GF composites can be used under high temperature environment.
{"title":"Synthesis and characterization of cyano-terminated bisphenol AF-type polyarylene ether nitrile","authors":"X. Xiong, Donghui Liu, R. Ren, Jing Wang","doi":"10.1177/09540083231183099","DOIUrl":"https://doi.org/10.1177/09540083231183099","url":null,"abstract":"Four novel phthalonitrile-capped polyarylene ether nitrile oligomers containing trifluoromethyl groups (FPEN-Ph) with different molecular weight were designed and synthesized by adjusting the ratio of bisphenol AF (BPAF) and 2,6-dicholorobenzonitrile (DCBN). The molecular structure of FPEN-Ph oligomers were characterized and analyzed by FTIR, 1HNMR and Gel permeation chromatography. Their curing behaviors were studied by Differential scanning calorimetry and rheological tests, and curing kinetics were also discussed by gel method in detail. The glass fiber cloth reinforced FPEN-Ph composites (FPEN-Ph/GF) had flexural strengths of 415.9–497.5 MPa, shear strengths of 34.5–50.5 MPa, and glass transition temperatures ( Tgs) in the range of 211.3°C–416.6°C. The initial thermal decomposition temperatures ( T5%) of various FPEN-Ph cured products were higher than 500°C under nitrogen. Meanwhile, Fracture morphologies showed that the GF/FPEN-Ph composites had excellent interfacial adhesion between FPEN-Ph matrix and GF reinforcement. Herein, the FPEN-Ph resin could be a good candidate for high-performance polymeric composites and the advanced FPEN-Ph/GF composites can be used under high temperature environment.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45910204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-07DOI: 10.1177/09540083231191415
Hansong Liu, Xiaoyi Ma, Kai Wang, X. Zhong, J. Bao
Polyimide (PI) aerogels with excellent properties have received a lot of attention, and the use of nanoparticles to improve the properties of aerogels has been investigated in the last few years. In this work, aminated functionalized MXene nanoparticles were successfully prepared as a cross-linking agent as well as an inorganic reinforcing phase, homogeneously embedded in PI aerogels, to synthesize a new PI composite aerogel. The results show that m-MXene can act as a cross-linking point to effectively maintain the network structure, which further improves the dimensional stability and compressive modulus. These PI composite aerogels have a high specific surface area, low density, low shrinkage and excellent mechanical properties.
{"title":"Preparation and properties of aminated MXene cross-linked polyimide aerogels","authors":"Hansong Liu, Xiaoyi Ma, Kai Wang, X. Zhong, J. Bao","doi":"10.1177/09540083231191415","DOIUrl":"https://doi.org/10.1177/09540083231191415","url":null,"abstract":"Polyimide (PI) aerogels with excellent properties have received a lot of attention, and the use of nanoparticles to improve the properties of aerogels has been investigated in the last few years. In this work, aminated functionalized MXene nanoparticles were successfully prepared as a cross-linking agent as well as an inorganic reinforcing phase, homogeneously embedded in PI aerogels, to synthesize a new PI composite aerogel. The results show that m-MXene can act as a cross-linking point to effectively maintain the network structure, which further improves the dimensional stability and compressive modulus. These PI composite aerogels have a high specific surface area, low density, low shrinkage and excellent mechanical properties.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42516531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The tribological behaviour of polyether ether ketone (PEEK) polymer filled with various concentrations of recovered silicon particles (0, 1, 3, 5, and 10 wt%) fabricated by the hot press technique was investigated in this research work. The hardness and wear properties of the prepared composite materials were evaluated through the Shore D hardness and the pin-on-disc methods. The Shore D hardness of the PEEK composite containing 10% silicon was about 95. This was due to the silicon's better dispersion influencing hardness enhancement. The current study found that adding 10% recycled silicon to PEEK decreased the rate of wear to 0.77*10−6 mm3/Nm and the coefficient of friction (COF) to 0.06. PEEK composites are filled with 10% silicon particles. Silicon particles were responsible for elevating wear resistance and anti-friction behaviour compared to pure virgin PEEK. The wear-behaviour of the PEEK/Silicon composite was greatly influenced by the formation of a transfer film, which avoids direct contact between countersurface steel asperities and the composite. The lubricity effect was obtained by incorporating silicon particles in the PEEK matrix as sliding surfaces with a steel counter surface that tend to form iron oxide and passive hydration mixed transfer films, decreasing COF and wear considerably. The tribofilm firmly adheres to the counter disc through the mechanical interlocking of silicon particles, enabling higher tribofilm bond strength.
{"title":"Impact of recovered silicon particles incorporation on tribo-characteristics of a poly ether ether ketone polymer composite","authors":"Anbarasu Perumal, Rajkumar Kaliyamoorthy, Vishal Kumar","doi":"10.1177/09540083231189894","DOIUrl":"https://doi.org/10.1177/09540083231189894","url":null,"abstract":"The tribological behaviour of polyether ether ketone (PEEK) polymer filled with various concentrations of recovered silicon particles (0, 1, 3, 5, and 10 wt%) fabricated by the hot press technique was investigated in this research work. The hardness and wear properties of the prepared composite materials were evaluated through the Shore D hardness and the pin-on-disc methods. The Shore D hardness of the PEEK composite containing 10% silicon was about 95. This was due to the silicon's better dispersion influencing hardness enhancement. The current study found that adding 10% recycled silicon to PEEK decreased the rate of wear to 0.77*10−6 mm3/Nm and the coefficient of friction (COF) to 0.06. PEEK composites are filled with 10% silicon particles. Silicon particles were responsible for elevating wear resistance and anti-friction behaviour compared to pure virgin PEEK. The wear-behaviour of the PEEK/Silicon composite was greatly influenced by the formation of a transfer film, which avoids direct contact between countersurface steel asperities and the composite. The lubricity effect was obtained by incorporating silicon particles in the PEEK matrix as sliding surfaces with a steel counter surface that tend to form iron oxide and passive hydration mixed transfer films, decreasing COF and wear considerably. The tribofilm firmly adheres to the counter disc through the mechanical interlocking of silicon particles, enabling higher tribofilm bond strength.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42155758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A high effective P/N-containing flame retardant additive CDD was triumphantly synthesized with nitrogen-rich 3,5-Diamino-1,2,4-triazole, DOPO and cinnamaldehyde. With the help of 4 wt% CDD, Epoxy resin (EP) sample succeeded in UL-94 V-0 test, and improved its LOI value to 33.5%. EP/4 wt%CDD sample also performed very well in cone calorimeter (CC) test. For example, the peak of heat release rate of EP/4 wt%CDD decreased to 603 kW/m2, which was 56.8% of EP sample without flame retardants. All these details showed that CDD was highly effective in fire resistance. Besides, the addition of CDD also drastically improved mechanical strength of EP. Tensile strength, flexural strength and izod iMPact strength of EP/4 wt%CDD sample was increased to 102 MPa, 124 MPa and 38 kJ m−2, which was 118.6%, 129.2% and 126.7% of control group. At last, the flame-retardant mechanism of CDD was studied by FTIR, XPS, Raman spectra, and SEM. The results showed that CDD’s perfect performance in fire resistance was ascribed to the generation of phosphorus-rich char layer in condensed phase.
{"title":"Synthesis of a phosphorus and triazole-containing compound and its enhancement on flame retardancy and mechanical properties of an epoxy resin","authors":"Menghua Ma, Rui Chen, Wei Huang, Shidong Zhao, Guohui Li, Lingling Bao","doi":"10.1177/09540083231187748","DOIUrl":"https://doi.org/10.1177/09540083231187748","url":null,"abstract":"A high effective P/N-containing flame retardant additive CDD was triumphantly synthesized with nitrogen-rich 3,5-Diamino-1,2,4-triazole, DOPO and cinnamaldehyde. With the help of 4 wt% CDD, Epoxy resin (EP) sample succeeded in UL-94 V-0 test, and improved its LOI value to 33.5%. EP/4 wt%CDD sample also performed very well in cone calorimeter (CC) test. For example, the peak of heat release rate of EP/4 wt%CDD decreased to 603 kW/m2, which was 56.8% of EP sample without flame retardants. All these details showed that CDD was highly effective in fire resistance. Besides, the addition of CDD also drastically improved mechanical strength of EP. Tensile strength, flexural strength and izod iMPact strength of EP/4 wt%CDD sample was increased to 102 MPa, 124 MPa and 38 kJ m−2, which was 118.6%, 129.2% and 126.7% of control group. At last, the flame-retardant mechanism of CDD was studied by FTIR, XPS, Raman spectra, and SEM. The results showed that CDD’s perfect performance in fire resistance was ascribed to the generation of phosphorus-rich char layer in condensed phase.","PeriodicalId":12932,"journal":{"name":"High Performance Polymers","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48716056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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