SiO_2粒子对PMMA/SAN共混体系相分离行为的影响  

EFFECT OF SiO_2 PARTICLES ON PHASE-SEPARATION OF POLY(METHYL METHACRYLATE)/POLY(STYRENE-co-ACRYLONITRILE) BLENDS

作　　者：吴强[1] 杜淼[1] 彭懋[1] 左敏[1] 郑强[1] 

机构地区：[1]高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程学系,杭州310027

出　　处：《高分子学报》2007年第3期223-229,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号20304014);教育部博士点基金(基金号20040335077)资助项目

摘　　要：采用小角激光光散射(SALLS)并结合动态流变学方法,考察了气相法二氧化硅(SiO2)粒子的加入对聚甲基丙烯酸甲酯/苯乙烯-丙烯腈无规共聚物(PMMA/SAN)共混体系相行为的影响,得到了添加SiO2粒子前后的相图,发现SiO2粒子对基体相行为的影响与基体的组成有关.对PMMA/SAN(60/40)体系,加入SiO2粒子后相分离温度上升,但并未改变相分离机理,仍为亚稳单相分解过程(spinodal decomposition,SD);而对于PMMA/SAN(30/70)体系,加入SiO2粒子后却降低了体系的相分离温度.该现象可能是SiO2粒子和基体组分界面间组成与PMMA/SAN共混物基体组成的差异造成的.The effect of fumed silica （SiO2） particles on the phase behavior of poly（methyl methacrylate） （PMMA）/poly （styrene-co-acrylonitrile） （SAN） blends was studied by using small angle laser light scattering （SALLS） and dynamic rheology. The phase diagram of PMMA/SAN blends unfilled and filled with SiO2 particles was obtained. The results revealed that the influence of SiO2 particles on the phase separation behavior of the blend matrix was related to the components of PMMA/SAN blends. Comparing with the 60/40（ W/W） PMMA/SAN blends, the addition of a small amount of SiO2 particles could increase the phase-separation temperature （ Ts ） and could hardly result in the changes of phase separation mechanism, namely, both filled and unfilled blends obeyed the spinodal decomposition mechanism. However, for 30/70 PMMA/SAN blends, the addition of SiO2 particles decreases Ts . This phenomenon was attributed to the component difference between the surface of SiO2 particles and the matrix of PMMA/SAN blends.

关 键 词：聚甲基丙烯酸甲酯/聚(苯乙烯-丙烯腈)共混物 气相法SiO2粒子 相分离 小角激光光散射 动态流变行为 

分 类 号：O631.3[理学—高分子化学]