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首页> 外文期刊>Journal of Applied Polymer Science >Crystallization-induced shrinkage, crystalline, and thermomechanical properties of in situ polymerized cyclic butylene terephthalate
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Crystallization-induced shrinkage, crystalline, and thermomechanical properties of in situ polymerized cyclic butylene terephthalate

机译：原位聚合环对苯二甲酸丁二醇酯的结晶诱导收缩，结晶和热机械性能

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摘要

The polymerization and crystallization of cyclic butylene terephthalate oligomers (CBT) were followed by fiber Bragg grating (FBG) and normal force measurements under isothermal conditions at T = 170 and 190 degrees C, respectively. It was found that the FBG and normal force sense only the crystallization-induced shrinkage. The course of the FBG signal and the normal force as a function of time suggested that crystallization of the polymerized CBT (pCBT) occurs in two steps. The primary crystallization-induced shrinkage is several hundreds by contrast to the secondary one showing several tens in ppm/min unit according to the FBG results. The two-step crystallization was confirmed by normal force measurements. The studied by differential scanning calorimetry and wide-angle X-ray scattering. It was found that the crystallinity and the crystalline parameters slightly differ for the pCBTs formed at T 170 and 190 degrees C, respectively. The pCBT produced at T 190 degrees C had slightly higher crystallinity and more perfect crystals than the pCBT formed at T = 170 degrees C. The reliability of the FBG sensing was checked by thermo-mechanical analysis (TMA). A fair agreement was established between the thermal contraction and thermal expansion measured by FBG and TMA, respectively. (c) 2008 Wiley Periodicals, Inc.
机译：分别在T = 170和190摄氏度的等温条件下，进行纤维布拉格光栅（FBG）和法向力测量，然后进行环状对苯二甲酸丁二醇酯低聚物（CBT）的聚合和结晶。发现FBG和法向力仅感测到结晶引起的收缩。 FBG信号的过程和法向力作为时间的函数表明，聚合的CBT（pCBT）的结晶分两个步骤发生。相比之下，根据FBG结果，一次晶化引起的收缩为几百，而第二次晶化显示的收缩为数十ppm / min。通过法向力测量确认了两步结晶。通过差示扫描量热法和广角X射线散射进行了研究。发现在170℃和190℃分别形成的pCBT的结晶度和结晶参数略有不同。与在T = 170摄氏度下形成的pCBT相比，在190摄氏度下生产的pCBT具有更高的结晶度和更完美的晶体。通过热机械分析（TMA）检查了FBG传感的可靠性。在分别由FBG和TMA测量的热收缩和热膨胀之间建立了公平的协议。 （c）2008 Wiley期刊公司

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