摘要
考察了氢化苯乙烯－丁二烯嵌段共聚弹性体(ＳＥＢＳ)及其马来酸酐接枝共聚物(ＳＥＢＳ－ｇ－ＭＡ)增韧聚苯醚(ＰＰＯ)体系．ＤＳＣ谱图显示,ＰＰＯ与ＳＥＢＳ的共混物仅有一个Ｔｇ,两者完全相容;ＰＰＯ与ＳＥＢＳ－ｇ－ＭＡ的共混物存在两个Ｔｇ,只能达到部分相容．力学性能研究表明,在ＰＰＯ/ＳＥＢＳ体系中,基体中分散相ＳＥＢＳ的相界面模糊,无法引发基体银纹和剪切屈服,增韧ＰＰＯ的效果有限;而部分相容的ＰＰＯ/ＳＥＢＳ－ｇ－ＭＡ共混物显示了增韧剂良好的相界面引发基体银纹和剪切屈服的作用,其缺口冲击强度在ＳＥＢＳ－ｇ－ＭＡ质量分数为２０%时达到１２６０ Ｊ/ｍ的超韧性．亚微相态显示,ＳＥＢＳ在ＰＰＯ中呈现条形分散相的“海岛”结构;而 ＳＥＢＳ－ｇ－ＭＡ在基体中呈现网络结构．流变性能研究显示,ＰＰＯ/ＳＥＢＳ共混物的表观粘度均高于ＰＰＯ,并随ＳＥＢＳ的含量增加而变大;而ＰＰＯ/ＳＥＢＳ－ｇ－ＭＡ则完全相反．
The toughening system of poly(phenylene oxide) (PPO) blends with hydrogenated styrene-bu-tadiene block elastomer(SEBS) and a version grafted with maleic anhydride(SEBS-g-MA) was investigat-ed. Dfferential scanning calorimeter thermograms demonstrated that PPO was miscible with SEBS, whichshowed a unique Tg, but PPO was partially compatible with SEBS-g-MA because there were two of Tg.Toughness research revealed that PPO/SEBS blends achieved litter higher notched Ized impact strengththan pure PPO. However, SEBS-g-MA could toughen PPO effectively and the blends reached supertoughness with a notched Izod impact strength of 1 260J/m at the SEBS-g-MA content of 20%. Trans-mission electron microscopy showed a typical 'sea-island' structure in PPO domain. However, SEBS-g-MA demonstrated a network structure in PPO matrix. Toughness improvement for PPO blends withSEBS-g-MA was contributed to stress releasing in micro-cavity. The rheological properties study revealedthat the apparent viscosity of PPO/SEBS blends was improved with the increasing of SEBS content, butopposite for PPO/SEBS-g-MA blends.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期739-743,共5页
Chemical Journal of Chinese Universities
基金
国家"八六三"高新技术计划项目(批准号:715-007-0060)资助.
