HDPE/sPS/SEBS共混物中增容剂的分布及对力学性能的影响  

Influence of Compatibilizers Distribution on Mechanical Properties of HDPE/sPS/SEBS Blend

作　　者：陈斌[1] 杨雷[1] 冯静[1] 赵丽萍[2] 张学全[2] 

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《高分子材料科学与工程》2014年第1期82-86,共5页Polymer Materials Science & Engineering

摘　　要：用2种组成相近而相对分子质量不同的苯乙烯-乙烯/丁烯-苯乙烯共聚物(SEBS)增容高密度聚乙烯/间规聚苯乙烯(m(HDPE)/m(sPS)=80/20)共混物。利用增容剂(SEBS)与共混物组分之间溶解性的差异,以四氢呋喃(THF)为溶剂选择刻蚀掉增容剂相,采用扫描电镜(SEM)观察了共混物的形态结构及增容剂在共混物中的分布情况;结合拉伸测试,阐明了增容剂的相对分子质量及其分布对HDPE/sPS共混物力学性能的影响。结果表明,较低相对分子质量的SEBS主要分布在两相界面,并能显著提高两相界面粘接性,进而能有效提高共混物的拉伸强度;而较高相对分子质量的SEBS更倾向以胶束形式分散在HDPE基相中,不能明显改善界面强度,但却有利于改善共混物的韧性。High density polyethylene/syndiotactic polystyrene （HDPE/sPS） blends were compatibilized using two kinds of styrene-ethylene/butylene-styrene （SEBS） triblock copolymer with different molecular weight （MW） as compatibilizer. The distribution of SEBS copolymers in HDPE/sPS blend was observed on the tetrahydrofuran （THF） etched surfaces of cryogenically knife-cut specimens of the blends through scanning electron microscopy （SEM）. The correlation between the distribution of SEBS copolymers and mechanical properties of the blends was evaluated. SEM revels that both the higher MW SEBS （K1651） and the lower MW one （K1650） are effective to reduce the domain size of dispersed phase sPS. As to the distribution of the compatibilizers, K1650 mainly anchors along the interface of the blend and the chain segments of K1650 permeate into sPS domain and HDPE matrix, which results in a stronger interracial adhesive as evidenced by the rough and irregular edges of sPS and HDPE; while K1651 tends to form micelles and disperses in the HDPE matrix. Tensile tests indicate that K1650 compatibilized blends exhibit a significantly improved tensile strength due to improved interracial adhesion; K1651 is more efficient in increasing the elongation at break of the blends than K1650.

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 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]