PPO/SEBS-g-MAH共混体系的形态结构与冲击性能  

MORPHOLOGY AND IMPACT PROPERTY OF PPO/ELASTOMERIC STYRENE-BASED BLOCK COPOLYMER BLENDS

作　　者：冯威[1] 张强[2] 武德珍[2] 李齐方[2] 励杭泉[2] 金日光[2] 

机构地区：[1]中国科学院化学研究所,507组北京市100080 [2]北京化工大学材料科学与工程学院,北京100029

出　　处：《高分子学报》2000年第5期573-576,共4页Acta Polymerica Sinica

基　　金：国家863计划新材料领域资助课题!(课题号8637150070060)

摘　　要：从亚微相态和冲击性能出发 ,对比了采用熔融挤出法制备的PPO/SEBS和PPO/SEBS g MAH两种共混物 .结果表明 ,在本文所研究的弹性体用量范围内 ,PPO/SEBS为“海 岛”型结构 ,而PPO/SEBS g MAH呈现网状结构 ;PPO/SEBS体系无脆韧转变现象 ,PPO/SEBS g MAH体系则在弹性体用量为 10 %～ 15 %时出现明显的脆韧转变 ,缺口冲击强度达到 95 0J/m ,这种超韧现象源于其网状结构的形成 .文中进一步用DSC和毛细管流变仪对共混体系的热性能和流变性能进行了测试 ,探讨了PPO/SEBS gTwo kinds of PPO blends,PPO/SEBS (Kraton G 1651) and PPO/SEBS\| g MAH (Kraton FG 1901) prepared through melting extrusion,were compared in morphology and impact properies.TEM studies showed that in PPO/SEBS blends the elastomer is dispersed in the PPO matrix in a thick cylinder shape and forms the sea\|island morphology until the content of SEBS is up to 500mg·g -1 .In PPO/SEBS\| g MAH blends,if the concentration of elastomer is in the range from 0 to 100mg·g -1 ,SEBS\| g MAH is dispersed in PPO continuous phase in a thin cylinder shape,when SEBS\| g MAH is 150mg·g -1 ,it forms a network morphology.The notched impact strength revealed that ductile\|brittle transition doesn't occur in PPO/SEBS blends,but occures for PPO/SEBS\| g MAH blends in the content range of SEBS\| g MAH from 100 to 150mg·g -1 .This super\|toughened level results from the network morphology in PPO/SEBS\| g MAH blend.Furthermore,thermal and rheological behavior of PPO blends were measured by DSC and Instron capillary rheometer.DSC revealed that the PS segment in SEBS copolymers was miscible completely with PPO,and the PS segment in SEBS\| g MAH was miscible partly with PPO.DSC result showed that there was higher phase separation in PPO/SEBS\| g MAH blends than in PPO/SEBS blends.Rheological behavior revealed that at the same shear rate,the melt viscosity of SEBS\| g MAH was lower than that of PPO,and the melt viscosity of SEBS was higher than that of PPO.Rheological result showed that SEBS\| g MAH trended to encapsulate PPO during melting extrusion and has the thin cylinder shape or network structure in PPO matrix with the increasing of SEBS-g-MAH.

关 键 词：PPO SEBS-G-MAH 网状形态结构 共混物 冲击性能 

分 类 号：O631[理学—高分子化学]