增容剂对动态硫化氯化丁基橡胶/尼龙12热塑性弹性体性能的影响

Effect of compatibilizers on dynamic vulcanized chlorinated butyl rubber/polyamide 12 thermoplastic elastomers

分别以聚丙烯接枝马来酸酐(PP-g-MAH)、苯乙烯-乙烯-丁二烯-苯乙烯共聚物接枝马来酸酐(SEBS-g-MAH)以及新型改性剂苯乙烯-共轭二烯烃嵌段共聚物选择加氢物(SEPS)作为增容剂,考察了不同增容剂对动态硫化氯化丁基橡胶/尼龙12热塑性弹性体(PA 12/CIIR TPV)物理机械性能的影响,并研究了PP-g-MAH增容TPV的相态结构以及流变性能、结晶性能、动态力学性能、气密性。结果表明,与SEBS-g-MAH、SEPS相比,PP-g-MAH对TPV的增容效果更显著;随着PP-g-MAH用量的增加,TPV中橡胶相平均粒径减小,分散更均匀,两相界面更模糊;在相同剪切速率下,PP-g-MAH增容TPV的黏度比未加增容剂时有明显下降,随着PP-g-MAH用量的增加,TPV表观黏度对剪切速率的变化越敏感,挤出物外观由光滑转变为竹节状,动态力学性能提高,但结晶性能和气密性下降,综合考虑,PP-g-MAH的最佳用量为5份。

Effects of different kinds of compatibilizers,such as polypropylene grafted maleic anhydride（PP-g-MAH）,styrene-ethylene-butadiene-styrene copolymer grafted maleic anhydride（SEBS-g-MAH） and hydrogenated styrene-isoprene-styrene block copolymer（SEPS） on properties of the chlorinated butyl rubber/polyamide 12 thermoplastic vulcanizates（CIIR/PA 12 TPV） were investigated.The morphology,rheological properties,crystallization property,dynamic mechanical properties and air permeability of CIIR/PA 12 TPV with PP-g-MAH were studied.The results showed that,compared with SEBS-g-MAH and SEPS,PP-g-MAH had more effective compatibilization to CIIR/PA 12 TPV.With increasing PP-g-MAH amount,the average diameter of rubber phase particles decreased,the particles dispersed uniformly in resin phase,and the phase interface became ambiguous.At the same shearing rate,the apparent viscosity of TPV with PP-g-MAH was smaller than that of TPV without compatibilizer.With increasing PP-g-MAH amount,the apparent viscosity was sensitive to shearing rate,the extrudate appearance changed from smooth to bamboo-ridge,the dynamic mechanical properties was improved,and the crystallization property and air permeability decreased.