Pub Date : 2009-05-01DOI: 10.1177/0095244308099412
Wang Jincheng, Zheng Xiaoyu, Chen Yuehui, Lu Zhijun, Zhu Zengliang
Nano-BaSO4 was treated with surface modification agents and was mixed with different contents into the matrix of polybutadiene styrene rubber (SBR) to obtain composites. The cure characteristics, tensile and wear resistance properties of different nano-BaSO4 filled SBR composites were studied using scanning electron microscopy (SEM) and the mechanism was analyzed. Experimental results demonstrated that the incorporation of 2 phr 2%-SA modified nano-BaSO4 powder into neat SBR system can decrease the abrasion loss from 0.160 cm to 0.115 cm, a decrease of about 28%.
{"title":"Properties and Mechanism Research on Polybutadiene Styrene Rubber (SBR) Composites Containing Nano-BaSO4","authors":"Wang Jincheng, Zheng Xiaoyu, Chen Yuehui, Lu Zhijun, Zhu Zengliang","doi":"10.1177/0095244308099412","DOIUrl":"https://doi.org/10.1177/0095244308099412","url":null,"abstract":"Nano-BaSO4 was treated with surface modification agents and was mixed with different contents into the matrix of polybutadiene styrene rubber (SBR) to obtain composites. The cure characteristics, tensile and wear resistance properties of different nano-BaSO4 filled SBR composites were studied using scanning electron microscopy (SEM) and the mechanism was analyzed. Experimental results demonstrated that the incorporation of 2 phr 2%-SA modified nano-BaSO4 powder into neat SBR system can decrease the abrasion loss from 0.160 cm to 0.115 cm, a decrease of about 28%.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"3 1","pages":"263 - 276"},"PeriodicalIF":1.7,"publicationDate":"2009-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79104264","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}
Pub Date : 2009-05-01DOI: 10.1177/0095244308095014
H. A. Youssef, M. Ismail, Magdy A. M. Ali, A. H. Zahran
The influence of thermoplastic/bagasse fiber ratio, as well as electron beam irradiation on the physicomechanical properties of low-density polyethylene (LDPE) and high-density polyethylene (HDPE) composites has been investigated. The concentration of bagasse fibers ranges from 20 to 80 wt%. The results indicate that there is deterioration in the properties as fiber concentration increased; however, it becomes significant only beyond 50% (w/w) bagasse fibers in both LDPE and HDPE composites. Also, the data show that this decrease in the properties is more pronounced in HDPE rather than LDPE composites. It can be noticed that enhancing adhesion between fibers and thermoplastics can be achieved by irradiation of the thermoplastic phase prior to mixing at 10 up to 60 kGy; a maximum improvement in the properties is observed at 40 and 10 kGy for LDPE and HDPE, respectively. From the data it can be seen that the increase in the flexural properties is higher than 100%, while it does not exceed 65% for impact toughness. On the other hand, the reduction in water absorption is not more than 5.5%. Also, examining SEM micrographs reveals that there is some sort of adhesion between fibers and thermoplastics phases.
{"title":"Studies on Sugarcane Bagasse Fiber—Thermoplastics Composites","authors":"H. A. Youssef, M. Ismail, Magdy A. M. Ali, A. H. Zahran","doi":"10.1177/0095244308095014","DOIUrl":"https://doi.org/10.1177/0095244308095014","url":null,"abstract":"The influence of thermoplastic/bagasse fiber ratio, as well as electron beam irradiation on the physicomechanical properties of low-density polyethylene (LDPE) and high-density polyethylene (HDPE) composites has been investigated. The concentration of bagasse fibers ranges from 20 to 80 wt%. The results indicate that there is deterioration in the properties as fiber concentration increased; however, it becomes significant only beyond 50% (w/w) bagasse fibers in both LDPE and HDPE composites. Also, the data show that this decrease in the properties is more pronounced in HDPE rather than LDPE composites. It can be noticed that enhancing adhesion between fibers and thermoplastics can be achieved by irradiation of the thermoplastic phase prior to mixing at 10 up to 60 kGy; a maximum improvement in the properties is observed at 40 and 10 kGy for LDPE and HDPE, respectively. From the data it can be seen that the increase in the flexural properties is higher than 100%, while it does not exceed 65% for impact toughness. On the other hand, the reduction in water absorption is not more than 5.5%. Also, examining SEM micrographs reveals that there is some sort of adhesion between fibers and thermoplastics phases.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"115 1","pages":"245 - 262"},"PeriodicalIF":1.7,"publicationDate":"2009-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74286968","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}
Pub Date : 2009-05-01DOI: 10.1177/0095244308091785
M. Valero, J. Pulido, J. C. Hernández, J. A. Posada, Á. Ramírez, Zhengdong Cheng
We present novel polyurethanes from renewable materials of castor oil and starch. Castor oil is transesterified with pentaerythritol in order to obtain a wide range of polyols. Yucca starch is converted into glycoside through transglycosylation reactions with ethylene glycol and glycerol. The glycosides from starch are then chemically incorporated to the castor oil polyols by a second transesterification reaction to generate a sequence of polyol-glycosides with a high level of polyhydroxyl content. These products are characterized by the hydroxyl value, viscosity, and specific gravity as a function of the glycoside type content and the kind of castor oil polyol prepared. MALDI TOF mass spectroscopy is used to find the mass fraction of glycosides and polyol-glycosides. Polyurethanes are synthesized from the polyol-glycosides by reaction with isophorone diisocyanate, under different NCO/OH molar ratios. The polymer characterization is accomplished by Fourier transform infrared analysis, tensile stress—strain tests, Shore A hardness, thermogravimetric analysis, chemical resistance to solvents, scanning electron microscopy, and dynamic-mechanical thermal analysis.
{"title":"Preparation and Properties of Polyurethanes based on Castor Oil Chemically Modified with Yucca Starch Glycoside","authors":"M. Valero, J. Pulido, J. C. Hernández, J. A. Posada, Á. Ramírez, Zhengdong Cheng","doi":"10.1177/0095244308091785","DOIUrl":"https://doi.org/10.1177/0095244308091785","url":null,"abstract":"We present novel polyurethanes from renewable materials of castor oil and starch. Castor oil is transesterified with pentaerythritol in order to obtain a wide range of polyols. Yucca starch is converted into glycoside through transglycosylation reactions with ethylene glycol and glycerol. The glycosides from starch are then chemically incorporated to the castor oil polyols by a second transesterification reaction to generate a sequence of polyol-glycosides with a high level of polyhydroxyl content. These products are characterized by the hydroxyl value, viscosity, and specific gravity as a function of the glycoside type content and the kind of castor oil polyol prepared. MALDI TOF mass spectroscopy is used to find the mass fraction of glycosides and polyol-glycosides. Polyurethanes are synthesized from the polyol-glycosides by reaction with isophorone diisocyanate, under different NCO/OH molar ratios. The polymer characterization is accomplished by Fourier transform infrared analysis, tensile stress—strain tests, Shore A hardness, thermogravimetric analysis, chemical resistance to solvents, scanning electron microscopy, and dynamic-mechanical thermal analysis.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"112 1","pages":"223 - 244"},"PeriodicalIF":1.7,"publicationDate":"2009-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90769615","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}
Pub Date : 2009-04-01DOI: 10.1177/0095244308092436
Y. Denev, Georgi D. Denev, A. Popov
The possibilities for modifying the surface of phosphogypsum (CaSO 4 · 2H2O) used as reinforcing material in polyethylene (PE) composites are investigated. The used method for surface modification of filler is the treatment with polyethylene glycol (PEG). The product has improved properties of compatibility with organic phase (polymer matrix). The use of PEG as modifier is described. The surface modified phosphogypsum and reinforcement materials have improved the properties including tensile strength. The optimum amount of PEG used for surface modification is 1—3%. These modified fillers and reinforcement materials may be used in a wide range of applications. The present study relates to a method for the surface modification of waste phosphogypsum and to their use in PE composites. The change in the surface characteristics of the filler influences also the properties of the composites in which they are used.
{"title":"Surface Modification of Phosphogypsum Used as Reinforcing Material in Polyethylene Composites","authors":"Y. Denev, Georgi D. Denev, A. Popov","doi":"10.1177/0095244308092436","DOIUrl":"https://doi.org/10.1177/0095244308092436","url":null,"abstract":"The possibilities for modifying the surface of phosphogypsum (CaSO 4 · 2H2O) used as reinforcing material in polyethylene (PE) composites are investigated. The used method for surface modification of filler is the treatment with polyethylene glycol (PEG). The product has improved properties of compatibility with organic phase (polymer matrix). The use of PEG as modifier is described. The surface modified phosphogypsum and reinforcement materials have improved the properties including tensile strength. The optimum amount of PEG used for surface modification is 1—3%. These modified fillers and reinforcement materials may be used in a wide range of applications. The present study relates to a method for the surface modification of waste phosphogypsum and to their use in PE composites. The change in the surface characteristics of the filler influences also the properties of the composites in which they are used.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"172 1","pages":"119 - 132"},"PeriodicalIF":1.7,"publicationDate":"2009-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83773125","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}
Pub Date : 2009-03-01DOI: 10.1177/0095244308092438
J. E. Crespo, L. Sánchez, R. Balart, J. López
Owing to the relevance of plasticized PVC in the industrial plastic transformation sector, mainly in such sectors as interior decoration (furniture, wood) toys, household goods, shoes, auxiliary sectors, etc., this material makes an interesting study subject from the perspective of quality improvement, benefits, and versatility. The present study analyzes the fracture behavior of vinyl plastisols. With this objective, a low-toxicity plasticizer derived from dicarboxilate di-isononyl-cyclohexane-1,2-dicarboxylate,- DINCH and another plasticizer derived from ftalate, diethylhexyl phthalate — DEHP, widely employed at an industrial level, albeit with toxicity problems, has been used. The basis of this study is an analysis of the effects of the DINCH and DEHP plasticizers used, and their concentration in the fracture of the plastisol in order to optimize the service response of the material. This is conducted by means of a study of the fracture morphologies of the plastisols, in order to determine the mechanisms which cause the crack and to carry out a classification of the resulting topography of the fracture. This is directly linked to the plasticizer concentration, to the type of plasticizer used, and to the mechanical response obtained from the material.
{"title":"Mechanical Properties and Fracture Surface Morphology of Dehp and Dinch Based Vinyl Plastisols","authors":"J. E. Crespo, L. Sánchez, R. Balart, J. López","doi":"10.1177/0095244308092438","DOIUrl":"https://doi.org/10.1177/0095244308092438","url":null,"abstract":"Owing to the relevance of plasticized PVC in the industrial plastic transformation sector, mainly in such sectors as interior decoration (furniture, wood) toys, household goods, shoes, auxiliary sectors, etc., this material makes an interesting study subject from the perspective of quality improvement, benefits, and versatility. The present study analyzes the fracture behavior of vinyl plastisols. With this objective, a low-toxicity plasticizer derived from dicarboxilate di-isononyl-cyclohexane-1,2-dicarboxylate,- DINCH and another plasticizer derived from ftalate, diethylhexyl phthalate — DEHP, widely employed at an industrial level, albeit with toxicity problems, has been used. The basis of this study is an analysis of the effects of the DINCH and DEHP plasticizers used, and their concentration in the fracture of the plastisol in order to optimize the service response of the material. This is conducted by means of a study of the fracture morphologies of the plastisols, in order to determine the mechanisms which cause the crack and to carry out a classification of the resulting topography of the fracture. This is directly linked to the plasticizer concentration, to the type of plasticizer used, and to the mechanical response obtained from the material.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"42 1","pages":"145 - 161"},"PeriodicalIF":1.7,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90736138","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}
Pub Date : 2009-03-01DOI: 10.1177/0095244308095015
O. Bianchi, R. Fiorio, J. N. Martins, A. J. Zattera, C. H. Scuracchio, L. B. Canto
The copolymer ethylene vinyl acetate (EVA) and blends of EVA and ground tire rubber (GTR) with different compositions are prepared in the presence and absence of dicumyl peroxide (DCP) as a crosslinking agent. The crosslinking kinetics is investigated through oscillatory disc rheometry (ODR) and differential scanning calorimetry (DSC). The crosslinking kinetics is found to be dependent on the amount of GTR in the EVA/GTR blends; the partially crosslinked GTR phase acts as a physical barrier, slowing down the EVA crosslinking rate. Furthermore, activation energies (Ea) and reaction order (n) values suggest that the crosslinking reactions are not restricted to the EVA bulk, but can also occur to some extent at the EVA/GTR interface.
{"title":"Crosslinking Kinetics of Blends of Ethylene Vinyl Acetate and Ground Tire Rubber","authors":"O. Bianchi, R. Fiorio, J. N. Martins, A. J. Zattera, C. H. Scuracchio, L. B. Canto","doi":"10.1177/0095244308095015","DOIUrl":"https://doi.org/10.1177/0095244308095015","url":null,"abstract":"The copolymer ethylene vinyl acetate (EVA) and blends of EVA and ground tire rubber (GTR) with different compositions are prepared in the presence and absence of dicumyl peroxide (DCP) as a crosslinking agent. The crosslinking kinetics is investigated through oscillatory disc rheometry (ODR) and differential scanning calorimetry (DSC). The crosslinking kinetics is found to be dependent on the amount of GTR in the EVA/GTR blends; the partially crosslinked GTR phase acts as a physical barrier, slowing down the EVA crosslinking rate. Furthermore, activation energies (Ea) and reaction order (n) values suggest that the crosslinking reactions are not restricted to the EVA bulk, but can also occur to some extent at the EVA/GTR interface.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"15 1","pages":"175 - 189"},"PeriodicalIF":1.7,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84330148","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}
Pub Date : 2009-03-01DOI: 10.1177/0095244308092439
R. Shtarkova, N. Dishovsky
Different elastomer-based composites for microwave absorbers are developed. The influence of chemical character and structure of the polymer matrix and chemical nature and concentration of fillers with high values of the imaginary part of the complex dielectric permittivity and magnetic permeability on the microwave properties of the absorbers is investigated. Natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), nitrile butadiene rubber (NBR) are tested as polymer matrix. Graphite, furnace carbon black, acetylene carbon black and active carbon are used as fillers with high dielectric losses; natural magnetite is used as filler with high magnetic losses in our experiments. Some more important microwave parameters of the absorbers as function of frequency and composition (mass ratio filler/rubber) are measured.
{"title":"Elastomer-based Microwave Absorbing Materials","authors":"R. Shtarkova, N. Dishovsky","doi":"10.1177/0095244308092439","DOIUrl":"https://doi.org/10.1177/0095244308092439","url":null,"abstract":"Different elastomer-based composites for microwave absorbers are developed. The influence of chemical character and structure of the polymer matrix and chemical nature and concentration of fillers with high values of the imaginary part of the complex dielectric permittivity and magnetic permeability on the microwave properties of the absorbers is investigated. Natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), nitrile butadiene rubber (NBR) are tested as polymer matrix. Graphite, furnace carbon black, acetylene carbon black and active carbon are used as fillers with high dielectric losses; natural magnetite is used as filler with high magnetic losses in our experiments. Some more important microwave parameters of the absorbers as function of frequency and composition (mass ratio filler/rubber) are measured.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"31 1","pages":"163 - 174"},"PeriodicalIF":1.7,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77806728","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}
Pub Date : 2009-03-01DOI: 10.1177/0095244308088877
Wang Wei, Du Xingwen
The pre-impregnated woven fabric composite is the material which is used in the space inflatable structures for the state of uncured. So studying on properties of the pre-impregnated woven fabric composite is important for the space inflatable structures. The pre-impregnated woven fabric composite has its own properties which are not similar with the fabric or the fabric reinforced composite because of the existence of the uncured resin. In this paper, a picture frame analytical model is developed to account for large shear deformation and to calculate the stress and stiffness of the fabric. A mesostructure model which explains the uncured resin impede the structure to deform is also proposed. The picture frame experiment results are presented to validate this model. Results show the equation explains the properties of the material well. This paper may provide useful information for the further investigation in the characteristics of the space inflatable structures’ materials.
{"title":"The Analytical Model of Shear Properties of the Pre-impregnated Woven Fabric Composite","authors":"Wang Wei, Du Xingwen","doi":"10.1177/0095244308088877","DOIUrl":"https://doi.org/10.1177/0095244308088877","url":null,"abstract":"The pre-impregnated woven fabric composite is the material which is used in the space inflatable structures for the state of uncured. So studying on properties of the pre-impregnated woven fabric composite is important for the space inflatable structures. The pre-impregnated woven fabric composite has its own properties which are not similar with the fabric or the fabric reinforced composite because of the existence of the uncured resin. In this paper, a picture frame analytical model is developed to account for large shear deformation and to calculate the stress and stiffness of the fabric. A mesostructure model which explains the uncured resin impede the structure to deform is also proposed. The picture frame experiment results are presented to validate this model. Results show the equation explains the properties of the material well. This paper may provide useful information for the further investigation in the characteristics of the space inflatable structures’ materials.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"15 1","pages":"105 - 117"},"PeriodicalIF":1.7,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72656964","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}
Pub Date : 2009-03-01DOI: 10.1177/0095244308092437
S. Riyajan
The property of natural rubber (NR) is more interesting, except for some properties which need to improve. The cyclization reaction is an interesting reaction for modified NR to thermoplastic elastomer. The kinetic cyclization of deproteinized natural rubber (DPNR) or purified NR latex effectively performed in latex phase by using trimethylsilyl-trifluoromethane sulphonate or trimethyl silyl triflate (TMSOTF) is studied at various temperatures and times. The cyclized products are confirmed by NMR spectroscopies including one and 2D NMR. The kinetic of cyclization is investigated. It is found that the degree of cyclization in DPNR is a function of cyclization conditions. The rate constant (k) is 200 (s-1) at 100°C based on 95% of regression and the activation energy of cyclization in DPNR latex is 147.66kJ/mol. Some thermodynamic parameters: enthalpy, entropy, and free energy activation of 144.6kJ/mole, -269.11J/mole, and 246.9kJ/mole, respectively, are obtained for the cyclization of DPNR. The kinetic and thermodynamic parameters of cyclization obtained from this study indicate that an increase in the process temperature would increase the rate of cyclization formation.
{"title":"Activation Energy and Thermodynamic Parameters of Cyclization in Purified Natural Rubber Latex Using a Trimethyl Silyl Triflate","authors":"S. Riyajan","doi":"10.1177/0095244308092437","DOIUrl":"https://doi.org/10.1177/0095244308092437","url":null,"abstract":"The property of natural rubber (NR) is more interesting, except for some properties which need to improve. The cyclization reaction is an interesting reaction for modified NR to thermoplastic elastomer. The kinetic cyclization of deproteinized natural rubber (DPNR) or purified NR latex effectively performed in latex phase by using trimethylsilyl-trifluoromethane sulphonate or trimethyl silyl triflate (TMSOTF) is studied at various temperatures and times. The cyclized products are confirmed by NMR spectroscopies including one and 2D NMR. The kinetic of cyclization is investigated. It is found that the degree of cyclization in DPNR is a function of cyclization conditions. The rate constant (k) is 200 (s-1) at 100°C based on 95% of regression and the activation energy of cyclization in DPNR latex is 147.66kJ/mol. Some thermodynamic parameters: enthalpy, entropy, and free energy activation of 144.6kJ/mole, -269.11J/mole, and 246.9kJ/mole, respectively, are obtained for the cyclization of DPNR. The kinetic and thermodynamic parameters of cyclization obtained from this study indicate that an increase in the process temperature would increase the rate of cyclization formation.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"42 1","pages":"133 - 144"},"PeriodicalIF":1.7,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0095244308092437","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72508644","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}
Pub Date : 2009-01-01DOI: 10.1177/0095244308088880
Shyla George, P. Kumari, G. Unnikrishnan
The sorption and diffusion of n-alkanes, namely, hexane, heptane, and octane through crosslinked Ethylene—Propylene—Diene Monomer/ Poly(ethylene-co-vinyl acetate) (EPDM/EVA) blends has been examined in the temperature interval of 28—58°C. Special reference has been given to the effects of blend composition, crosslinking systems, penetrant nature, and temperature on the liquid transport. The solvent uptake was found to decrease with increase in EVA content in the blends. The blends were crosslinked by three crosslinking systems namely, sulfur, dicumyl peroxide (DCP), and a mixture consisting of sulfur and peroxide. The DCP crosslinked system exhibited the lowest solvent uptake. These observations have been correlated with the phase morphology of the blends using scanning electron micrographs. The values of the kinetic parameters of permeability and molar mass between crosslinks have been found to be complementary to the observations. The experimental diffusivity values have been compared with different theoretical models.
{"title":"Aliphatic Liquid Transport through Heterogeneous Ethylene—Propylene— Diene Monomer Rubber/Poly (ethylene-co-vinyl acetate) Blends","authors":"Shyla George, P. Kumari, G. Unnikrishnan","doi":"10.1177/0095244308088880","DOIUrl":"https://doi.org/10.1177/0095244308088880","url":null,"abstract":"The sorption and diffusion of n-alkanes, namely, hexane, heptane, and octane through crosslinked Ethylene—Propylene—Diene Monomer/ Poly(ethylene-co-vinyl acetate) (EPDM/EVA) blends has been examined in the temperature interval of 28—58°C. Special reference has been given to the effects of blend composition, crosslinking systems, penetrant nature, and temperature on the liquid transport. The solvent uptake was found to decrease with increase in EVA content in the blends. The blends were crosslinked by three crosslinking systems namely, sulfur, dicumyl peroxide (DCP), and a mixture consisting of sulfur and peroxide. The DCP crosslinked system exhibited the lowest solvent uptake. These observations have been correlated with the phase morphology of the blends using scanning electron micrographs. The values of the kinetic parameters of permeability and molar mass between crosslinks have been found to be complementary to the observations. The experimental diffusivity values have been compared with different theoretical models.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"191 1","pages":"65 - 85"},"PeriodicalIF":1.7,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74187486","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}
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