摘要
分别采用2种组成相近而分子量不同的苯乙烯-乙烯/丁烯-苯乙烯共聚物(SEBS)以及两者的混合物对高密度聚乙烯/间规聚苯乙烯(HDPE/s PS)共混物进行增容改性。通过扫描电镜(SEM)及拉伸实验试验考查了增容剂的分子量及含量对HDPE/s PS共混物形态结构及力学性能的影响。结果表明:两种增容剂都能降低s PS分散相尺寸,使两相界面的粘合力增强。相对较低分子量的SEBS(K1652)能显著提高两相界面粘结性,进而能有效提高共混物的拉伸强度,而较高分子量的SEBS(K1651)能显著改善共混物的韧性。一定比例混合的共聚物作为增容剂在改善共混物性能方面具有协同效应,可以同时提高共混物拉伸强和断裂伸长率,混合增容剂效果优于单一增容剂。HDPE/s PS共混物中加入质量分数4%的K1652和2%的K1651,共混物的综合力学性能最优。
Two triblock copolymers of poly[styrene-b-（ethylene-co-butylene）-b-styrene] （SEBS） with different molecular weights and their mixture were respectively used to compatibilize high density polyethylene/syndiotactic polystyrene（HDPE/sPS）blends. Effects of the molecular weight and compatibilizer content on morphology and mechanical properties of HDPE/sPS blends were investigated by SEM and tensile test. The results show the phase size of the dispersed sPS particles can be significantly reduced by addition of two copolymers,and the interfacial adhesion between the two phases can be dramatically enhanced, too. Lower molecular weight SEBS （K1652） can dramatically improve the interfacial adhesion, leading to a significant improvement in tensile strength, while higher molecular weight SEBS （K1651） is efficient in increasing the elongation at break of the blends. Using certain proportion mixture of two copolymers as compatibilizer is better than that using a single one, which has a synergistic effect in improving the tensile properties of HDPE/sPS blends. The optimal mechanical property of the blends can be achieved by addition of mixed compatibilizer （2%K1651/4%K1652）.
出处
《当代化工》
CAS
2014年第12期2497-2501,共5页
Contemporary Chemical Industry
关键词
间规聚苯乙烯
高密度聚乙烯
增容剂
形态结构
力学性能
Syndiotactic polystyrene
High density polyethylene
Compatibilizer
Morphology
Mechanical property
