Morphologies and interfacial tensions of immiscible polypropylene/polystyrene blends modified with triblock copolymers
Morphologies and interfacial tensions of immiscible polypropylene/polystyrene blends modified with triblock copolymers
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DOI：
10.1016/s0032-3861(00)00655-8
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发表时间：
2001-03
期刊：
影响因子：
4.6
通讯作者：
P. H. P. Macaubas-P.-H.-P.-Macaubas-93101826;N. Demarquette
中科院分区：
文献类型：
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作者：
P. H. P. Macaubas-P.-H.-P.-Macaubas-93101826;N. Demarquette
研究了苯乙烯-丁二烯-苯乙烯（SBS）或苯乙烯-乙烯-丁烯-苯乙烯（SEBS）三嵌段共聚物增容聚丙烯/聚苯乙烯（PP/PS 90/10）共混物的形态结构及其对小振幅振荡剪切（SAOS）的响应。研究了使用形态学和流变学测量推断PP和PS之间的界面张力作为添加到共混物中的三嵌段共聚物量的函数的可能性。相容剂的浓度范围为相对于分散相（PS）的重量的0至25%。增容剂的加入导致分散相颗粒的尺寸减小，遵循乳液曲线。SBS被证明形成第三相时，在高浓度下，加入到共混物。加入相容剂的PS相导致界面张力降低以下的乳液曲线。结果表明，对于这两种增容剂，界面张力基本趋于稳定的浓度小于分散相的平均半径基本趋于稳定的浓度。形态结构、粘度和界面张力的测定结果表明，SEBS对PP/PS共混物的增容效果优于SBS。
The morphology and the response to small amplitude oscillatory shear (SAOS) of polypropylene/polystyrene (PP/PS 90/10) blends compatibilized with styrene–butadiene–styrene (SBS) or styrene–ethylene/butylene–styrene (SEBS) triblock copolymer were studied in this work. The possibility of inferring the interfacial tension between PP and PS as a function of amount of triblock copolymer added to the blend using the morphological and rheological measurements was investigated. The concentration of compatibilizers ranged from 0 to 25% relative to the weight of the dispersed phase (PS). The addition of compatibilizers resulted in a reduction of the size of the dispersed phase particles following an emulsion curve. SBS was shown to form a third phase when added, at high concentrations, to the blend. The addition of compatibilizers to the PS phase resulted in a reduction of interfacial tension following an emulsion curve. It was shown that for both compatibilizers the concentration at which the interfacial tension essentially levels off is smaller than the concentration at which the average radius of the dispersed phase essentially levels off. The morphological, viscosity and interfacial tension results showed that SEBS is a better compatibilizer for the PP/PS blend than is SBS.