CAJ | 학술논문

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/sPS）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/sPS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sPS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/sPS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。
분별채용2충조성상근이분자량불동적분을희－을희/정희－분을희공취물(SEBS)이급량자적혼합물대고밀도취을희/간규취분을희（HDPE/sPS）공혼물진행증용개성。통과소묘전경（SEM）급랍신실험시험고사료증용제적분자량급함량대HDPE/sPS공혼물형태결구급역학성능적영향。결과표명：량충증용제도능강저sPS분산상척촌，사량상계면적점합력증강。상대교저분자량적SEBS（K1652）능현저제고량상계면점결성，진이능유효제고공혼물적랍신강도，이교고분자량적SEBS（K1651）능현저개선공혼물적인성。일정비례혼합적공취물작위증용제재개선공혼물성능방면구유협동효응，가이동시제고공혼물랍신강화단렬신장솔，혼합증용제효과우우단일증용제。HDPE/sPS공혼물중가입질량분수4%적K1652화2%적K1651，공혼물적종합역학성능최우。
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).