NBR/EMA TPV压缩永久变形的可逆回复及机制研究
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摘要
采用动态硫化法制备了乙烯-丙烯酸甲酯共聚物(EMA)/丁腈橡胶(NBR)热塑性硫化胶(TPV),研究了橡塑比及热处理温度对压缩永久变形可逆回复的影响,探讨了可逆回复机制,并通过数据拟合,构建了可逆回复的物理模型。结果表明:随着橡塑比和热处理温度的提高,TPV的压缩永久变形的回复速度和回复程度均有一定程度的提高,且EMA/NBR质量比为30/70的样品在60℃时可完全回复;通过模型构建,研究橡塑比和热处理温度对回复的不同阶段的影响。
Thermoplastic vulcanizate(TPV)based on ethylene-methyl acrylate copolymer(EMA)/nitrile-butadiene rubber(NBR)blends were prepared by dynamic vulcanization.investigating systematically how the reversible recovery of compression set was influences by weight ratio and temperature of heat-treatment,together with the mechanism of the reversible recovery of the TPV.Experimental results indicated that increasing the EMA content in TPV and increasing heat-treatment temperature could,to some degree,lead to the fast recovery of compression set and improve the degree of recovery;moreover,the TPV which weight ratio is 30/70 had best reversible deformation ability when the temperature of heat-treatment was 60℃.The model of the reversible recovery of the TPV were carried out and the influences of weight ratio and temperature of heat-treatment on the time of relaxation in each stage of the recovery course were discussed.
Thermoplastic vulcanizate(TPV)based on ethylene-methyl acrylate copolymer(EMA)/nitrile-butadiene rubber(NBR)blends were prepared by dynamic vulcanization.investigating systematically how the reversible recovery of compression set was influences by weight ratio and temperature of heat-treatment,together with the mechanism of the reversible recovery of the TPV.Experimental results indicated that increasing the EMA content in TPV and increasing heat-treatment temperature could,to some degree,lead to the fast recovery of compression set and improve the degree of recovery;moreover,the TPV which weight ratio is 30/70 had best reversible deformation ability when the temperature of heat-treatment was 60℃.The model of the reversible recovery of the TPV were carried out and the influences of weight ratio and temperature of heat-treatment on the time of relaxation in each stage of the recovery course were discussed.
引文
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[2]于文娟,张艺馨,王兆波.BR/EVA TPV的制备及性能研究[J].橡胶工业,2011,58(9):535-538.
[3]王利杰,郎丰正,李帅,等,乙烯-醋酸乙烯共聚物/氯化聚乙烯共混型热塑性硫化胶的增强研究[J].青岛科技大学学报(自然科学版),2013,34(1):57-61.
[4]李帅,赵洪玲,宋现芬,等.炭黑增强SBR/EVA/HIPS热塑性硫化胶的性能研究[J].特种橡胶制品,2012,33(6):1-4.
[5]吕秀凤.硫化体系对动态硫化EPDM/POE热塑性弹性体性能的影响[J].特种橡胶制品,2010,31(6):22-25.
[6]DUIN M V.Recent developments for EPDM-based thermoplastic vulcanizates[J].Macromolecular Symposia,2006,233(1):11-16.
[7]HUY T A,LUEPKE T,RADUSCH H J.Characterization of the deformation behavior of dynamic vulcanizates by FTIR spectroscopy[J].Journal of Applied Polymer Science,2001,80(2):148-158.