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首页> 美国卫生研究院文献>Materials >Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners
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Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners

机译：PC / ABS共混物热处理过程中的形貌形成及共混物粘度比的影响

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摘要

Morphology formation during compounding, as well as injection molding of blends containing 60 wt % polycarbonate (PC) and 40 wt % polybutadiene rubber-modified styrene-acrylonitrile copolymers (ABS), has been investigated by transmission electron microscopy (TEM). Profiles of the blend morphology have been recorded in injection-molded specimens and significant morphology gradients observed between their skin and core. A <10 µm thick surface layer with strongly dispersed and elongated nano-scale (streak-like) styrene acrylonitrile (SAN) phases and well-dispersed, isolated SAN-grafted polybutadiene rubber particles is followed by a 50–150 µm thick skin layer in which polymer morphology is characterized by lamellar SAN/ABS phases. Thickness of these lamellae increases with the distance from the specimen’s surface. In the core of the specimens the SAN-grafted polybutadiene rubber particles are exclusively present within the SAN phases, which exhibit a much coarser and less oriented, dispersed morphology compared to the skin. The effects of the viscosity of the SAN in the PC/ABS blends on phase morphologies and correlations with fracture mechanics in tensile and impact tests were investigated, including scanning electron microscopy (SEM) assessment of the fracture surfaces. A model explaining the mechanisms of morphology formation during injection molding of PC/ABS blends is discussed.
机译：已经通过透射电子显微镜（TEM）研究了在混合期间的形态形成以及注射成型包含60wt％聚碳酸酯（PC）和40wt％聚丁二烯橡胶改性的苯乙烯-丙烯腈共聚物（ABS）的共混物。共混物形态的轮廓已经记录在注塑样品中，并且在它们的表皮和核心之间观察到明显的形态梯度。 <10 µm厚的表面层具有强烈分散的细长纳米级（条纹状）苯乙烯丙烯腈（SAN）相和分散良好的分离的SAN接枝聚丁二烯橡胶颗粒，其后是50–150 µm厚的表皮层。哪种聚合物形态以层状SAN / ABS相为特征。这些薄片的厚度随着与样品表面的距离的增加而增加。在标本的核心中，SAN接枝的聚丁二烯橡胶颗粒仅存在于SAN相中，与皮肤相比，它们呈现出更粗糙，取向更少，分散的形态。研究了PC / ABS共混物中SAN粘度对相形态的影响以及在拉伸和冲击试验中与断裂力学的相关性，包括扫描电子显微镜（SEM）评估断裂表面。讨论了解释PC / ABS共混物注塑成型过程中形态形成机理的模型。

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