Yuwvaranni S, Amritta B, Weslen Vedakumari S, Chamundeeswari M
Iron nanoparticles (FeNPs) derived from herbal plants are being explored as potential MRI contrast agents due to their biocompatibility and ability for targeted drug delivery. We for the first time have attempted the usage of various novel combinations of leaf extracts like Azadirachta indica, and Piper betel and with two other Ayurvedic herbs extracts such as Asparagus racemosus and Symplocos for an ecofriendly green synthesis of FeNPs. The nanoparticles were coated on nanofibers made from banana pseudo (FENPs-NF) stem to enhance biocompatibility. The synthesis process was optimized using RSM and techniques like UV-Vis, VSM, AAS,FE-SEM, EDAX, and FT-IR was used for Characterization. Haemolytic, immune cell assays, MTT assay and MRI was analyzed. A peak at 325 nm through the UV-Vis spectroscopy, AAS, FE-SEM, EDAX, and FT-IR proved the presence of FeNPs. Haemolytic, immune cell assay was found to be compatible and MTT assay (MCF -7) showed inhibition at 250 µg/ml. The FeNPs and FeNPs-NF showed a good signal loss in MRI analysis at 1.5 Tesla based proving the property of contrast agent nature. Thus, synthesized FeNPs from herbal plant sources may open a new door for its potential application in the biomedical field as a chemical-free and biocompatible MRI contrast agent.
{"title":"Green synthesis and optimization of iron oxide nanoparticles using central composite design as MRI contrast agent","authors":"Yuwvaranni S, Amritta B, Weslen Vedakumari S, Chamundeeswari M","doi":"10.1680/jgrma.23.00089","DOIUrl":"https://doi.org/10.1680/jgrma.23.00089","url":null,"abstract":"Iron nanoparticles (FeNPs) derived from herbal plants are being explored as potential MRI contrast agents due to their biocompatibility and ability for targeted drug delivery. We for the first time have attempted the usage of various novel combinations of leaf extracts like <i>Azadirachta indica</i>, and <i>Piper betel</i> and with two other Ayurvedic herbs extracts such as <i>Asparagus racemosus</i> and <i>Symplocos</i> for an ecofriendly green synthesis of FeNPs. The nanoparticles were coated on nanofibers made from banana pseudo (FENPs-NF) stem to enhance biocompatibility. The synthesis process was optimized using RSM and techniques like UV-Vis, VSM, AAS,FE-SEM, EDAX, and FT-IR was used for Characterization. Haemolytic, immune cell assays, MTT assay and MRI was analyzed. A peak at 325 nm through the UV-Vis spectroscopy, AAS, FE-SEM, EDAX, and FT-IR proved the presence of FeNPs. Haemolytic, immune cell assay was found to be compatible and MTT assay (MCF -7) showed inhibition at 250 µg/ml. The FeNPs and FeNPs-NF showed a good signal loss in MRI analysis at 1.5 Tesla based proving the property of contrast agent nature. Thus, synthesized FeNPs from herbal plant sources may open a new door for its potential application in the biomedical field as a chemical-free and biocompatible MRI contrast agent.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"29 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140625259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ultraviolet (UV)-curable coatings were prepared using rosin-based polyurethane as an oligomer with different active diluents and crosslinking monomers. The effects of different components level on the properties of the polyurethane coatings were investigated, and the effects of the mass ratio of the active diluents, crosslinking monomers, adhesion promoting monomers, photoinitiators, and curing times on the polyurethane coatings were discussed. The results showed that when hydroxypropyl acrylate was used as an end-capping agent, 40% of methyl methacrylateas a reactive diluent, 10% of dimethylol propane tetracrylate as a crosslinking monomer, 7% of hydroxyethyl diacrylate phosphate as an adhesion promoter, 4% of 1173 as a photo-initiator, and a curing time of 120 s. UV-curable resin exhibited the best coating properties: pendulum hardness of 0.63, 60° gloss of 153.9, adhesion of grade 2, impact strength of 500 J m−2, and the water resistance exceeding 30 days.
{"title":"Preparation and properties of UV curable rosin-based polyurethane coatings","authors":"Jiongchao Li, Hongming Liu, Caili Yu, Jianben Xu, Faai Zhang","doi":"10.1680/jgrma.23.00136","DOIUrl":"https://doi.org/10.1680/jgrma.23.00136","url":null,"abstract":"Ultraviolet (UV)-curable coatings were prepared using rosin-based polyurethane as an oligomer with different active diluents and crosslinking monomers. The effects of different components level on the properties of the polyurethane coatings were investigated, and the effects of the mass ratio of the active diluents, crosslinking monomers, adhesion promoting monomers, photoinitiators, and curing times on the polyurethane coatings were discussed. The results showed that when hydroxypropyl acrylate was used as an end-capping agent, 40% of methyl methacrylateas a reactive diluent, 10% of dimethylol propane tetracrylate as a crosslinking monomer, 7% of hydroxyethyl diacrylate phosphate as an adhesion promoter, 4% of 1173 as a photo-initiator, and a curing time of 120 s. UV-curable resin exhibited the best coating properties: pendulum hardness of 0.63, 60° gloss of 153.9, adhesion of grade 2, impact strength of 500 J m<sup>−2</sup>, and the water resistance exceeding 30 days.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"44 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phase change energy storage building materials prepared by applying PCMs to building materials have the advantages of both common building materials and PCMs, the composites can help to regulate the indoor temperature, while the introduction of mPCMs technology can make up for the shortcomings of traditional PCMs. Therefore, in this paper, two different mPCMs are blended into the whisker-reinforced β-HPG-based composites to prepare a new lightweight thermal insulation and energy storage building material, which improves the thermal performance of the building material while improving the utilization rate of phosphogypsum to a certain extent. In this study, the mechanical, thermal conductivity and energy storage properties of the new building material were investigated through performance tests and compared with β-HPG-based composites without doped PCMs, The results showed that both PCMs could improve the mechanical strength of the materials. The incorporation of mPCMs increased the thermal conductivity and decreased the water absorption of the composites. In addition, the TG-DSC analysis showed that the addition of mPCMs improved the thermal storage properties of the composites, and the two mPCMs and their composites have good thermal stability and can be used in construction materials.
{"title":"Effect of phase change microcapsules on the properties of whisker-reinforced phosphogypsum-based composites","authors":"Jingdong Wang, Peng Liu, Dewen Kong, Yuan Li, Yaxin Yang, Yongfa Wang, Mingsheng Chen, Shuangying Yang","doi":"10.1680/jgrma.23.00118","DOIUrl":"https://doi.org/10.1680/jgrma.23.00118","url":null,"abstract":"Phase change energy storage building materials prepared by applying PCMs to building materials have the advantages of both common building materials and PCMs, the composites can help to regulate the indoor temperature, while the introduction of mPCMs technology can make up for the shortcomings of traditional PCMs. Therefore, in this paper, two different mPCMs are blended into the whisker-reinforced β-HPG-based composites to prepare a new lightweight thermal insulation and energy storage building material, which improves the thermal performance of the building material while improving the utilization rate of phosphogypsum to a certain extent. In this study, the mechanical, thermal conductivity and energy storage properties of the new building material were investigated through performance tests and compared with β-HPG-based composites without doped PCMs, The results showed that both PCMs could improve the mechanical strength of the materials. The incorporation of mPCMs increased the thermal conductivity and decreased the water absorption of the composites. In addition, the TG-DSC analysis showed that the addition of mPCMs improved the thermal storage properties of the composites, and the two mPCMs and their composites have good thermal stability and can be used in construction materials.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"34 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138686237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hana Iswahyuni, Nugraha Edhi Suyatma, Nur Wulandari, Hari Eko Irianto, Fera Roswita Dewi, Nurhayati, Ellya Sinurat, Rodiah Nurbayasari, Giyatmi, Dina Fransiska
This study aims to develop an edible coating based on virgin coconut oil (VCO) nanoemulsion, iota carrageenan and alginate to prolong the shelf life of pindang (mildly salted cooked) fish products. The research involved three stages: material preparation, characterization, and determination of factors and responses for experimental design; parameter optimization to achieve optimal conditions; and application and analysis of pre-and post-coating characteristics of pindang fish. The parameter ranges were 0.5-1.5% for alginate concentration, 0.5-1.5% for iota carrageenan concentration, and 0.5-1.0% for VCO nanoemulsion concentration. The results of this study were an optimized food coating solution that was clear and bright white in colour. Pindang fish coated with this layer showed improved quality in terms of water content (48.46%), weight loss (0.39%), pH (5.84), total volative base (47.01%), salt content (2.9%), appearance (7), texture (7), and slime (7);. At the same time, the total bacterial count remained unchanged (8 log CFU/g), mold count remained unchanged (5 log CFU/g), and the aroma and taste received a score of 6. Thus, this study successfully produced an optimized edible coating that can enhance the quality and extend the shelf life of pindang fish, making it suitable for broader market distribution.
{"title":"Application of edible coating made from blends of VCO nanoemulsion, iota carrageenan, and alginate for pindang fish preservation by using response surface methodology","authors":"Hana Iswahyuni, Nugraha Edhi Suyatma, Nur Wulandari, Hari Eko Irianto, Fera Roswita Dewi, Nurhayati, Ellya Sinurat, Rodiah Nurbayasari, Giyatmi, Dina Fransiska","doi":"10.1680/jgrma.23.00066","DOIUrl":"https://doi.org/10.1680/jgrma.23.00066","url":null,"abstract":"This study aims to develop an edible coating based on virgin coconut oil (VCO) nanoemulsion, iota carrageenan and alginate to prolong the shelf life of pindang (mildly salted cooked) fish products. The research involved three stages: material preparation, characterization, and determination of factors and responses for experimental design; parameter optimization to achieve optimal conditions; and application and analysis of pre-and post-coating characteristics of pindang fish. The parameter ranges were 0.5-1.5% for alginate concentration, 0.5-1.5% for iota carrageenan concentration, and 0.5-1.0% for VCO nanoemulsion concentration. The results of this study were an optimized food coating solution that was clear and bright white in colour. Pindang fish coated with this layer showed improved quality in terms of water content (48.46%), weight loss (0.39%), pH (5.84), total volative base (47.01%), salt content (2.9%), appearance (7), texture (7), and slime (7);. At the same time, the total bacterial count remained unchanged (8 log CFU/g), mold count remained unchanged (5 log CFU/g), and the aroma and taste received a score of 6. Thus, this study successfully produced an optimized edible coating that can enhance the quality and extend the shelf life of pindang fish, making it suitable for broader market distribution.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"1 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qunli Zhang, Tao Liu, Baozhong Wang, Xuanrui Cheng, Wenjing Zhang, Xiaohu Yang
To achieve green and clean energy heating, improve the performance of phase change material energy storage heating systems (PCMEHS), a novel magnesium chloride hexahydrate/expanded graphite/calcium hydroxide composite phase change material (CPCM) was developed. The thermal properties and phase separation characteristics of the CPCM were experimentally characterized. The results show that MgCl2·6H2O/EG CPCM composed of 7.5% EG has good thermal storage performance without affecting the phase change performance. On this basis, the nucleating agent calcium hydroxide was added to further eliminate the supercooling of the material. The thermophysical properties of the ternary CPCM were tested, and the samples were characterized and analyzed from the microstructure. The thermal conductivity of the ternary CPCM is 2.825 W·m−1·K−1, about 4.66 times that of pure MgCl2·6H2O (0.606 W·m−1·K−1), and the supercooling is 0°C. The results of these thermal characteristics show that MgCl2·6H2O/EG/Ca(OH)2 CPCM has great application potential in clean and green energy heating system.
{"title":"Experimental study on the performance of a novel composite phase change energy storage material for clean heating","authors":"Qunli Zhang, Tao Liu, Baozhong Wang, Xuanrui Cheng, Wenjing Zhang, Xiaohu Yang","doi":"10.1680/jgrma.23.00028","DOIUrl":"https://doi.org/10.1680/jgrma.23.00028","url":null,"abstract":"To achieve green and clean energy heating, improve the performance of phase change material energy storage heating systems (PCMEHS), a novel magnesium chloride hexahydrate/expanded graphite/calcium hydroxide composite phase change material (CPCM) was developed. The thermal properties and phase separation characteristics of the CPCM were experimentally characterized. The results show that MgCl<sub>2·</sub>6H<sub>2</sub>O/EG CPCM composed of 7.5% EG has good thermal storage performance without affecting the phase change performance. On this basis, the nucleating agent calcium hydroxide was added to further eliminate the supercooling of the material. The thermophysical properties of the ternary CPCM were tested, and the samples were characterized and analyzed from the microstructure. The thermal conductivity of the ternary CPCM is 2.825 W·m<sup>−1</sup>·K<sup>−1</sup>, about 4.66 times that of pure MgCl<sub>2</sub>·6H<sub>2</sub>O (0.606 W·m<sup>−1</sup>·K<sup>−1</sup>), and the supercooling is 0°C. The results of these thermal characteristics show that MgCl<sub>2</sub>·6H<sub>2</sub>O/EG/Ca(OH)<sub>2</sub> CPCM has great application potential in clean and green energy heating system.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"41 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fei Sun, Mengjia Zhang, Haixin Zhu, Yuewen Huang, Bin Song, Peijiang Wang, Shanshan Jiang, Bin Wang
Zeolitic-imidazolate framework-8 (ZIF-8) are extensively researched and availed owing to their exclusive structural and excellent physicochemical properties while significant challenges of alleviating adverse effects of their particle form in many aspects are still facing scientific community. In this study, in situ growth of ZIF-8 within the pore channels and surfaces of green cellulose-based wood sponge was attempted through polydopamine mediated incubation. The wood sponge was prepared derived from eliminating lignin and hemicellulose from natural balsa wood. And then the sponge was impregnated into dopamine aqueous solution to yield polydopamine covered wood sponge. ZIF-8 crystals were ultimately in situ grew in substrate after sequentially impregnating in zinc nitrate hexahydrate and 2-methylimidazole aqueous solution at room temperature. Additional, the effect of deposition concentration of dopamine aqueous solution and ZIF-8 incubation time were investigated. The obtained ZIF-8@PWS was characterized using FTIR, SEM, XRD, BET and TGA. Finally, adsorption performance of porous ZIF-8@PWS toward toluene in aqueous solution was also briefly evaluated, and it demonstrated that maximum adsorption capacity was 106.4 mg.g −1 and the removal rate is as high as 94.2%. This work validates the envisioned universal protocol of preparing ZIF-8 decorated porous substrates via integrated mediate role of polydopamine.
{"title":"ZIF-8 decorated wood sponge derived from biomimetic mineralization of polydopamine and its adsorption toward toluene in aqueous","authors":"Fei Sun, Mengjia Zhang, Haixin Zhu, Yuewen Huang, Bin Song, Peijiang Wang, Shanshan Jiang, Bin Wang","doi":"10.1680/jgrma.23.00075","DOIUrl":"https://doi.org/10.1680/jgrma.23.00075","url":null,"abstract":"Zeolitic-imidazolate framework-8 (ZIF-8) are extensively researched and availed owing to their exclusive structural and excellent physicochemical properties while significant challenges of alleviating adverse effects of their particle form in many aspects are still facing scientific community. In this study, in situ growth of ZIF-8 within the pore channels and surfaces of green cellulose-based wood sponge was attempted through polydopamine mediated incubation. The wood sponge was prepared derived from eliminating lignin and hemicellulose from natural balsa wood. And then the sponge was impregnated into dopamine aqueous solution to yield polydopamine covered wood sponge. ZIF-8 crystals were ultimately in situ grew in substrate after sequentially impregnating in zinc nitrate hexahydrate and 2-methylimidazole aqueous solution at room temperature. Additional, the effect of deposition concentration of dopamine aqueous solution and ZIF-8 incubation time were investigated. The obtained ZIF-8@PWS was characterized using FTIR, SEM, XRD, BET and TGA. Finally, adsorption performance of porous ZIF-8@PWS toward toluene in aqueous solution was also briefly evaluated, and it demonstrated that maximum adsorption capacity was 106.4 mg.g −1 and the removal rate is as high as 94.2%. This work validates the envisioned universal protocol of preparing ZIF-8 decorated porous substrates via integrated mediate role of polydopamine.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rita Kássia da Silva, Christiane Siqueira de Azevedo Sá, Ivan Alves de Souza, José Heriberto Oliveira do Nascimento, Cátia Guaraciara F T Rossi, Michelle Cequeira Feitor, Késia K O S Silva
In this study, a promising microemulsion delivery system containing andiroba essential oil, lemongrass essential oil, and chitosan was developed and applied in 100% cotton fabrics to provide antibacterial functionality. The developed micellar systems were characterized by coloration, electrical conductivity, viscosity, zeta potential, particle size, temperature resistance, and microbial activity analyses. The microemulsions in the substrates were verified by FTIR analyses and microbial activity before and after the domestic washing of the functionalized fabrics. The microemulsions SMs_P1 and SMs_P4 showed more significant inhibitory action against Staphylococcus aureus, Escherichia coli, and Enterobacter sp. bacteria, observed in the functionalized samples before and after domestic washing. In this study, the microemulsions SMs_P1 and SMs_P4 developed and tested on 100% cotton fabrics have greater application viability because they showed inhibitory action against gram-positive and gram-negative bacteria Staphylococcus aureus, Escherichia coli, and Enterobacter sp. This antibacterial functionality of the microemulsions was also observed in 100% cotton fabrics treated with them (Ta_SMs_P1 and Ta_SMs_P4) before and after domestic washing, as demonstrated by FTIR and antimicrobial activity analyses, with greater emphasis on microemulsion SMs_P4, which has lower concentrations than SMs_P1 and showed significant values (halo size) in blocking the action of Escherichia coli bacteria.
{"title":"Micellar systems of the o/w type with essential oils of andiroba and lemon grass with applications for the elimination of bacterial activity","authors":"Rita Kássia da Silva, Christiane Siqueira de Azevedo Sá, Ivan Alves de Souza, José Heriberto Oliveira do Nascimento, Cátia Guaraciara F T Rossi, Michelle Cequeira Feitor, Késia K O S Silva","doi":"10.1680/jgrma.23.00056","DOIUrl":"https://doi.org/10.1680/jgrma.23.00056","url":null,"abstract":"In this study, a promising microemulsion delivery system containing andiroba essential oil, lemongrass essential oil, and chitosan was developed and applied in 100% cotton fabrics to provide antibacterial functionality. The developed micellar systems were characterized by coloration, electrical conductivity, viscosity, zeta potential, particle size, temperature resistance, and microbial activity analyses. The microemulsions in the substrates were verified by FTIR analyses and microbial activity before and after the domestic washing of the functionalized fabrics. The microemulsions SMs_P1 and SMs_P4 showed more significant inhibitory action against Staphylococcus aureus, Escherichia coli, and Enterobacter sp. bacteria, observed in the functionalized samples before and after domestic washing. In this study, the microemulsions SMs_P1 and SMs_P4 developed and tested on 100% cotton fabrics have greater application viability because they showed inhibitory action against gram-positive and gram-negative bacteria Staphylococcus aureus, Escherichia coli, and Enterobacter sp. This antibacterial functionality of the microemulsions was also observed in 100% cotton fabrics treated with them (Ta_SMs_P1 and Ta_SMs_P4) before and after domestic washing, as demonstrated by FTIR and antimicrobial activity analyses, with greater emphasis on microemulsion SMs_P4, which has lower concentrations than SMs_P1 and showed significant values (halo size) in blocking the action of Escherichia coli bacteria.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136295495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this research, NANH as a new synthetic organic nucleating agent was employed to overcome PLLA’s slow crystallization rate. Melt-crystallization showed that PLLA’s crystallization ability was significantly enhanced by NANH, even that NANH was still able to evidently accelerate PLLA’s crystallization upon cooling rate of 50 °C/min. Additionally, when the final melting temperature was 170°C, the onset melt-crystallization temperature and melt-crystallization peak temperature of PLLA/3%NANH were up to 160.0 °C and 155.1 °C. Isothermal crystallization showed that the half time of overall crystallization of PLLA/3%NANH was dramatically reduced, from 71.9 min at 135 °C for the virgin PLLA, to the minimum value of 0.3 min, and this advanced nucleation effect was speculated to be attributed to chemical nucleation via the theoretical analysis of frontier orbital energy. Melting behaviors under different conditions further confirmed the crystallization accelerating effect of NANH for PLLA’s crystallization, and the melting processes were affected by crystallization temperature and heating rate. Although NANH decreased PLLA’s thermal decomposition temperature in air, thermal decomposition temperatures of all PLLA/NANH were higher than 330 °C, which could meet the daily usage. Finally, the addition of NANH enhanced PLLA’s fluidity, however, the light transmittance was seriously weakened.
{"title":"Effects of NANH as nucleation agent on performances of PLLA","authors":"Hao Huang, Yanhua Cai, Lisha Zhao","doi":"10.1680/jgrma.22.00123","DOIUrl":"https://doi.org/10.1680/jgrma.22.00123","url":null,"abstract":"In this research, NANH as a new synthetic organic nucleating agent was employed to overcome PLLA’s slow crystallization rate. Melt-crystallization showed that PLLA’s crystallization ability was significantly enhanced by NANH, even that NANH was still able to evidently accelerate PLLA’s crystallization upon cooling rate of 50 °C/min. Additionally, when the final melting temperature was 170°C, the onset melt-crystallization temperature and melt-crystallization peak temperature of PLLA/3%NANH were up to 160.0 °C and 155.1 °C. Isothermal crystallization showed that the half time of overall crystallization of PLLA/3%NANH was dramatically reduced, from 71.9 min at 135 °C for the virgin PLLA, to the minimum value of 0.3 min, and this advanced nucleation effect was speculated to be attributed to chemical nucleation via the theoretical analysis of frontier orbital energy. Melting behaviors under different conditions further confirmed the crystallization accelerating effect of NANH for PLLA’s crystallization, and the melting processes were affected by crystallization temperature and heating rate. Although NANH decreased PLLA’s thermal decomposition temperature in air, thermal decomposition temperatures of all PLLA/NANH were higher than 330 °C, which could meet the daily usage. Finally, the addition of NANH enhanced PLLA’s fluidity, however, the light transmittance was seriously weakened.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134975698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biodegradable plastics can help tackle plastic packaging waste, which cause serious consequences for the environment, however, current bio-based materials often lack strength, have poor thermal and barrier properties, and are expensive. This study proposes a solution: biodegradable, edible pectin-alginate films reinforced by abundant and inexpensive orange peel powder (OPP). This study stands out for its comprehensive analysis of mechanical, thermal, barrier, morphological, and biodegradable properties by adjusting the type, amount, and size of OPP in the formulation. The resulting fully biodegradable films with 2% CaCl 2 , 0.7 g/g glycerol, and 30% finely ground OPP not only matched the quality of commercial packaging films in mechanical properties, but also exhibited promising qualities in terms of thermal, morphological, and water barrier properties for packaging applications. Made from natural, edible, and vegan materials, these films offer an eco-friendly alternative to non-biodegradable plastics, enhancing biocomposite properties and also providing a sustainable solution to organic waste.
{"title":"Structure-property relationship in edible pectin-alginate/orange peel biocomposite films","authors":"Merve Mocan, Sinan Barış Uncu","doi":"10.1680/jgrma.23.00082","DOIUrl":"https://doi.org/10.1680/jgrma.23.00082","url":null,"abstract":"Biodegradable plastics can help tackle plastic packaging waste, which cause serious consequences for the environment, however, current bio-based materials often lack strength, have poor thermal and barrier properties, and are expensive. This study proposes a solution: biodegradable, edible pectin-alginate films reinforced by abundant and inexpensive orange peel powder (OPP). This study stands out for its comprehensive analysis of mechanical, thermal, barrier, morphological, and biodegradable properties by adjusting the type, amount, and size of OPP in the formulation. The resulting fully biodegradable films with 2% CaCl 2 , 0.7 g/g glycerol, and 30% finely ground OPP not only matched the quality of commercial packaging films in mechanical properties, but also exhibited promising qualities in terms of thermal, morphological, and water barrier properties for packaging applications. Made from natural, edible, and vegan materials, these films offer an eco-friendly alternative to non-biodegradable plastics, enhancing biocomposite properties and also providing a sustainable solution to organic waste.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135246701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bohdan Domnich, Oleg Shevhcuk, V. Kirianchuk, A. Voronov
A range of cross-linkable latex copolymers with up to 90% biobased content was synthesized from isobornyl methacrylate combined with acrylic monomers based on high-oleic soybean (HO-SBM) or camelina (CMM) oil in miniemulsion polymerization. By varying HO-SBM and CMM macromolecular fraction, the cross-link density of resulted materials can be altered due to differences in the fatty acid profile of plant oil-based monomers. The glass transition temperature of the synthesized copolymers correlates very well with calculated Flory-Fox values. Higher cross-link density of the biobased copolymer films leads to a notable growth in materials modulus, while elongation at break decreases due to more restricted macromolecular mobility. Remarkably, the copolymer with the highest in a range unsaturation (based on CMM) shows an increase of both the modulus and elongation at break owned, perhaps to extended entanglements of fatty acids-based side chains. The adhesion performance of the cross-linked biobased copolymers was evaluated using shear and peel strength measurements on steel and polypropylene. Based on the obtained results, the amount of unsaturation in CMM and HO-SBM (determined by plant oil composition) can be applied as a criterion to adjust adhesion by choosing plant oil-based monomers (or their mixtures) with different unsaturation and provide properties and performance required for specific applications.
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