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Properties of glass-filled thermoplastic polyesters

机译：玻璃填充热塑性聚酯的性能

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The thermal, mechanical, and rheological properties of glass-filled poly(propylene terephthalate) (GF PPT) were compared to glass-filled poly(butylene terephthalate) (GF PBT). The impetus for this study was the recent commercial interest in PPT as a new glass-reinforced thermoplastic for injection-molding applications. This article represents the first systematic comparison of the properties of GF PPT and GF PBT in which differences in properties can be attributed solely to differences in the polyester matrices, that is, glass-fiber size and composition, polymer melt viscosity, nucleant content and composition, polymerization catalyst composition and content, and processing conditions were kept constant. Under these controlled conditions, GF PPT showed marginally higher tensile and flexural properties and significantly lower impact strength compared to GF PBT. The crystallization behavior observed by cooling from the melt at a constant rate showed that GF PBT crystallized significantly faster than did GF PPT. Nucleation of GF PPT with either talc or sodium stearate increased the rate of crystallization, but not to the level of GF PBT. The slower crystallization rate of GF PPT was found to strongly affect thermomechanical properties of injection-molded specimens. For example, increasing the polymer molecular weight and decreasing the mold temperature significantly increased the modulus drop associated with the glass transition. In contrast, the modulus-temperature response of GF PBT was just marginally influenced by the polymer molecular weight and was essentially independent of the mold temperature.
机译：将玻璃填充的聚对苯二甲酸丁二酯（GF PPT）与玻璃填充的聚对苯二甲酸丁二酯（GF PBT）的热，机械和流变性能进行了比较。这项研究的推动力是最近对PPT的商业兴趣，PPT是一种用于注塑成型应用的新型玻璃增强热塑性塑料。本文代表了GF PPT和GF PBT的性能的首次系统比较，其中性能差异仅归因于聚酯基质的差异，即玻璃纤维尺寸和组成，聚合物熔体粘度，成核物质含量和组成，聚合催化剂的组成和含量以及加工条件保持恒定。在这些受控条件下，与GF PBT相比，GF PPT的拉伸和弯曲性能略高，而冲击强度则显着降低。通过以恒定速率从熔体冷却观察到的结晶行为表明，GF PBT的结晶明显快于GF PPT。用滑石粉或硬脂酸钠成核GF PPT可以增加结晶速率，但不能达到GF PBT的水平。 GF PPT的较慢的结晶速率被发现强烈影响注塑样品的热机械性能。例如，增加聚合物分子量和降低模具温度显着增加了与玻璃化转变有关的模量下降。相反，GF PBT的模量-温度响应仅受聚合物分子量的一点影响，并且基本上与模具温度无关。

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