SEBS增韧PPE/PS合金的热氧老化性能  

Effects of Thermal-Oxidative Aging on the Properties of SEBS Toughened PPE/PS Alloy

作　　者：郭墨林 张珂 何志帅 钟一平 丁超 郑一泉 章明秋[1] GUO Molin;ZHANG Ke;HE Zhishuai;ZHONG Yiping;DING Chao;ZHENG Yiquan;ZHANG Mingqiu(School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China;Kingfa Science and Technology,Co.,Ltd.,Guangzhou 510663,China;SAIC VOLKSWAGEN Co.,Ltd.,Shanghai 201805,China)

机构地区：[1]中山大学化学学院,广东广州510275 [2]金发科技股份有限公司,广东广州510663 [3]上汽大众汽车有限公司,上海201805

出　　处：《塑料工业》2023年第4期66-72,共7页China Plastics Industry

摘　　要：系统研究了高温热氧老化对苯乙烯-乙烯-丁烯三嵌共聚物(SEBS)增韧聚苯醚(PPE)/聚苯乙烯(PS)合金结构与性能的影响,发现150℃老化2000 h后拉伸强度基本保持不变,但缺口冲击强度下降较为明显,主要原因在于PPE的热氧交联阻碍了SEBS的空洞化,因此增加SEBS含量有助于提升老化性能的保持率。进一步,本工作对于老化缺口冲击样条皮芯结构及其形成原因进行了研究,确定了老化发生的主要位置以及皮芯结构的产生原因,证明皮层在氧气存在下发生交联可以阻止氧气的进一步侵入,而芯层结构在热老化的条件下没有发生明显变化。This work systematically studied the effects of high temperature thermal-oxidative aging on the structure and properties of polyphenylene ether(PPE)/polystyrene(PS)alloy toughened by styrene ethylene butylene triblock copolymer(SEBS).It is found that the tensile strength remains basically unchanged after aging at 150℃for 2000 h,while the impact strength considerably decreases.The main reason is attributed to the fact that the thermal-oxidative crosslinking of PPE hinders cavitation of SEBS.In this context,increasing the content of SEBS would help to improve the retention of aging properties.Furthermore,the skin-core structure of notched Izod impact specimen after aging is carefully studied.The main locations of the specimen being aged and the cause for the skin-core structure formation during aging are identified.It is proved that cross-linking of the skin structure in the presence of oxygen can prevent further invasion of oxygen,while the core structure does not change significantly under the conditions of thermal aging.

关 键 词：聚苯醚 热氧老化 皮-芯结构 

分 类 号：TQ326.53[化学工程—合成树脂塑料工业] TQ325.2