EPDM

EPDM/PA硫化共混物力学行为的模拟

刘欣1，刘伟强1，谢续明2，张隐西3
（1.深圳清华大学研究院，广东深圳518057；2.清华大学化学工程系，北京100084；3.上海交通大学化学化工学院，上海200240）

摘要：采用Rivlin模型对EPDM/聚酰胺(PA)硫化共混物的单轴拉伸力学行为进行模拟。结果表明，2个参数的Rivlin模型可以较好地描述PA用量不超过30份时EPDM/PA静态硫化共混物的应力应变行为；3和5个参数的Rivlin模型在PA试验用量范围内对静态硫化共混物的拟合效果很好。3个参数的Rivlin模型可以很好地描述EPDM/PA动态硫化共混物的应力应变行为，但PA用量过大时，EPDM/PA动态硫化共混物显示出明显的塑料特征，拟合曲线与试验数据有所偏离。
关键词：EPDM；聚酰胺；硫化共混物；拉伸力学行为；Rivlin模型；模拟分析

中图分类号：O242.1；TQ330.1；TQ342+.1文献标识码：A文章编号：1000-890X(2007)03-0133-04
作者简介：刘欣（1972-），男，山东泰安人，深圳清华大学研究院博士后，主要从事高分子材料加工改性的应用研究。

Simulation of mechanical behaviour of vulcanized EPDM/PA blends

LIU Xin1,LIU Wei-qiang1,XIE Xu-ming2,ZHANG Yin-xi3
(1.Shenzhen Research Institute of Tsinghua University,Shenzhen518057,China;2.Tsinghua University,Beijing100084,China;3.Shanghai JiaotongUniversity,Shanghai200240,China)

Abstract:The uniaxial extension behaviour of vulcanized EPDM/polyamide(PA) blends was simulated with Rivlin model.The results showed that the Rivlin model with two parameters could be used to describe the stressstrain behaviour of statically vulcanized EPDM/PA blends with the addition level of PA up to 30 phr;the Rivlin models with three and five parameters gave good fit of statically vulcanized EPDM/PA blends with the addition level of PA used in the test;and the Rivlin model with three parameters could be used to describe the stressstrain behaviour of dynamically vulcanized EPDM/PA,but as the addition level of PA increased over a certain level,the dynamically vulcanized EPDM/PA blends would show the remarkable plastic characteristics and their fit curves would deviate from the test data.
Keywords:EPDM;polyamide;vulcanized blend;mechanical behaviour;Rivlin model;simulation

胶粉/高密度聚乙烯热塑性弹性体的性能研究

瓮子良1，冯予星1，伍社毛1，张立群1，2
（1.北京化工大学北京市新型高分子材料制备与加工重点实验室，北京100029；2.北京化工大学教育部纳米材料
重点实验室，北京100029）

摘要：制备胶粉/高密度聚乙烯(HDPE)热塑性弹性体(TPE)，并研究其性能。结果表明，混炼温度从150 ℃提高到200 ℃时，胶粉/HDPE TPE的强伸性能降幅较大，但流变性能较好，且挤出物表观质量较好，混炼温度以150 ℃为宜；胶粉改性时过辊次数增加可使其粒径进一步减小，从而提高改性胶粉/HDPE TPE的物理性能，但过辊次数增至一定程度时会使胶粉分子链降解，致使改性胶粉/HDPE TPE的物理性能降低；胶粉/HDPE TPE的返炼性能良好。
关键词：胶粉；高密度聚乙烯；热塑性弹性体；改性

中图分类号：TQ334.9；X783.3文献标识码：A文章编号：1000-890X(2007)03-0137-04
基金项目：国家自然科学基金资助项目(59903001)
作者简介：瓮子良（1977-）,男(蒙古族)，辽宁喀左县人，北京化工大学在读硕士研究生，主要从事胶粉/聚烯烃热塑性弹性体的研究。

Properties of crumb rubber/HDPE thermoplastic elastomer

WENG Ziliang,FENG Yuxing,WU Shemao,ZHANG Liqun
(Beijing University of Chemical Technology,Beijing100029,China)

Abstract:A crumb rubber/HDPE thermoplastic elastomer(TPE) was prepared and its properties were investigated.The results showed that the tensile strength of crumb rubber/HDPE TPE decreased significantly,but its rheological property and appearance quality of its extrudate improved by increasing the mixing temperature from 150 ℃ to 200 ℃,and the most suitable mixing temperature was 150 ℃;the increase of mill runs during modification of crumb rubber would make the particle size of crumb rubber finer resulting in the improved physical properties of modified crumb rubber/HDPE TPE,but as the mill runs increased over a certain level,the molecular chains of crumb rubber would break down resulting in poorer physical properties of modified crumb rubber/HDPE TPE;and the modified crumb rubber/HDPE TPE had good remillability.
Keywords:crumb rubber;HDPE;TPE;modification

热塑性弹性体热寿命和热降解动力学研究

胡付欣，杨性坤
（信阳师范学院化学化工学院，河南信阳464000）

摘要：用热重分析法研究苯乙烯二烯烃苯乙烯三嵌段共聚物(SIS,SBS和SI/BS)的热降解动力学及热寿命。结果表明，SIS，SBS和SI/BS在氮气气氛下的起始热降解温度分别为499.8，630.2和582.9 K，SBS的热稳定性高于SIS和SI/BS；SIS的热降解属扩散过程控制机理，SBS和SI/BS属随机成核和随后生长过程控制机理，SIS，SBS和SI/BS的热降解反应活化能分别为196.8，298.3和349.9 kJ·mol-1；SIS，SI/BS和SBS的热寿命依次延长。
关键词：热塑性弹性体；热重分析法；热寿命；活化能

中图分类号：TQ333；O643.1文献标识码：A文章编号：1000-890X(2007)03-0141-05
基金项目：河南省科技攻关资助项目（0424270033）
作者简介：胡付欣（1958-），男，河南长葛人，信阳师范学院副教授，主要从事物理化学和材料热化学研究。

Thermal lifetime and degradation kinetics of TPEs

HU Fuxin,YANG Xingkun
(Xinyang Normal College,Xinyang464000,China)

Abstract:The thermal lifetime and degradation kinetics of styrenedienestyrene triblock copolymers(SIS,SBS and SI/BS) were investigated by thermogravimetry.The results showed that the initial thermal degradation temperatures of SIS,SBS and SI/BS at nitrogen atmosphere were 499.8,630.2 and 582.9 K respectively indicating that the thermal stability of SBS was better than those of SIS and SI/BS;the diffusion process was predominant during the thermal degradation of SIS,the random nucleation and then growth process was predominant during the thermal degradations of SBS and SI/BS,and the activation energies of thermal degradations for SIS,SBS and SI/BS were 196.8,298.3 and 349.9 kJ·mol-1 respectively;and the order of thermal lifetimes was SIS＞SI/BS＞SBS.
Keywords:thermoplastic elastomer;thermogravimetry;thermal lifetime;activation energy