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首页> 外文期刊>Journal of Applied Polymer Science >Influence of plasticizers and cryogenic grinding on the high-cooling-rate solidification behavior of PBT/PET blends
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Influence of plasticizers and cryogenic grinding on the high-cooling-rate solidification behavior of PBT/PET blends

机译：增塑剂和低温研磨对PBT / PET共混物高冷却速率凝固行为的影响

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摘要

Two structurally different plasticizers (cyclic and linear) and the effect of cryogenic grinding on the solidification behavior at high cooling rates by a continuous cooling transformation approach of poly(butylene terephthalate)/poly(ethylene terephthalate), PBT/PET, blends are described. The solidification curve (density versus cooling rate) is confirmed as an effective tool to compare the differences in crystallization behavior under conditions mimicking processing. In comparison to the bulky cyclic plasticizer, the linear oligomeric one was found to have a more pronounced influence on the crystallization behavior. A 60/40 by weight PBT/PET blend shows a drop-off of density at similar to 50 K/s. In the plasticized sample, the long-range crystalline order appears up to a cooling rate of similar to 250K/s, making the blend comparable to pure PBT. Grinding the components before blending further improves crystallizability and synergy to the addition of the plasticizer. The results suggest the important role of local chain mobility in the solidification behavior at high cooling rates. (C) 2015 Wiley Periodicals, Inc.
机译：描述了两种结构不同的增塑剂（环状和线性）和低温研磨对聚对苯二甲酸丁二醇酯/聚对苯二甲酸乙二酯，PBT / PET混合物的连续冷却转化方法在高冷却速率下的凝固行为的影响。凝固曲线（密度与冷却速率）被确认为是在模拟加工条件下比较结晶行为差异的有效工具。与庞大的环状增塑剂相比，发现线性低聚物对结晶行为具有更明显的影响。重量为60/40的PBT / PET混合物显示出密度的下降，类似于50 K / s。在增塑的样品中，长程结晶顺序出现，直至冷却速率接近250K / s，这使得共混物可与纯PBT相提并论。在共混之前先研磨组分，可进一步提高结晶性和增塑剂协同作用。结果表明，在高冷却速率下，局部链移动在凝固行为中起着重要作用。 （C）2015年Wiley Periodicals，Inc.

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