摘要
研究了聚对苯二甲酸丙二酯(PTT)/茂金属聚乙烯(mPE)共混体系的流变性能、结晶熔融行为、力学性能以及增容剂对共混物相形态的影响。结果表明,PTT/mPE共混物熔体为假塑性流体,熔体表观黏度随PTT含量的增加而迅速降低,PTT含量高于40%(质量分数,下同)时共混物表观黏度迅速下降,PTT含量越高对温度变化的敏感性越强。PTT和mPE可分别结晶,但PTT组分的结晶峰温度Tpc和结晶熔融峰温度Tm均比纯PTT的明显提高,而mPE组分的Tpc和Tm与纯mPE的相近,mPE可以促进PTT熔体结晶,但已经形成的PTT晶体不影响mPE的结晶,mPE的结晶行为主要发生在mPE微相区内。增容剂马来酸酐接枝乙丙橡胶提高了PTT与mPE间的相容性,共混物的冲击强度随着增容剂含量的增加而提高,mPE和增容剂共同发挥了增韧作用。
The rheology, crystallization, and melting behaviors of PTT/mPE blends prepared by twinscrew extruder were studied. The influence of compatibilizer on the phase morphology of the blends and their mechanical property were also studied. All PTT/mPE blends were pseudo-plastic fluid, and their apparent viscosity decreased rapidly with increasing PTT content. The more content of the mPE, the less the temperature sensitivity, and the poorer the processability of the blends. Although PTT and mPE crystallized separately, the presence of mPE increased the crystallization temperature. However, PTT did not affect the crystallization behavior of mPE. The morphology of the fractured surface suggested that EPDM-g-MAH constituted a good compatibilizer for PTT and mPE. The blend possessed improved impact strength due to the toughening effect of mPE component.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第11期53-57,共5页
China Plastics
关键词
聚对苯二甲酸丙二酯
茂金属聚乙烯
流变学
熔融
结晶
poly （trimethylene terephthalate）
metallocene-catalyzed polyethylene
rheology
melting
crystallization
