Influence of a novel β‐nucleating agent on the structure, morphology, and nonisothermal crystallization behavior of isotactic polypropylene
Influence of a novel β‐nucleating agent on the structure, morphology, and nonisothermal crystallization behavior of isotactic polypropylene
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DOI：
10.1002/app.29139
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发表时间：
2009-01
影响因子：
3
通讯作者：
Wenchang Xiao;Peiyi Wu;Jiachun Feng;Riyuan Yao
中科院分区：
文献类型：
--
作者：
Wenchang Xiao;Peiyi Wu;Jiachun Feng;Riyuan Yao
采用广角x射线衍射、极性光学显微镜和差示扫描量热法研究了含稀土β-成核剂（WBG）和不含稀土β-成核剂（WBG）的等规聚丙烯（iPP）的结晶结构、形貌和非等温结晶行为。WBG能诱导β形态的形成，且最佳WBG浓度和较低的冷却速率共同作用可获得较高比例的β形态。在0.08 wt % WBG成核样品中，在低于5°C/min的冷却速率下，β形式的含量可达0.90以上。极性光学显微镜显示，WBG使iPP的形态发育和结晶过程发生了实质性的变化。在所有研究的冷却速率下，在成核剂的存在下，最大结晶速率发生的温度提高了8-11℃。对非等温结晶动力学的分析也表明，WBG的引入显著缩短了结晶的表观潜伏期和总结晶时间。©2008 Wiley期刊公司高分子学报，2009
The crystalline structure, morphology, and nonisothermal crystallization behavior of isotactic polypropylene (iPP) with and without a novel rare earth-containing β-nucleating agent (WBG) were investigated with wide-angle X-ray diffraction, polar optical microscopy, and differential scanning calorimetry. WBG could induce the formation of the β form, and a higher proportion of the β form could be obtained by the combined effect of the optimum WBG concentration and a lower cooling rate. The content of the β form could reach more than 0.90 in a 0.08 wt % WBG nucleated sample at cooling rates lower than 5°C/min. Polar optical microscopy showed that WBG led to substantial changes in both the morphological development and crystallization process of iPP. At all the studied cooling rates, the temperature at which the maximum rate of crystallization occurred was increased by 8–11°C in the presence of the nucleating agent. An analysis of the nonisothermal crystallization kinetics also revealed that the introduction of WBG significantly shortened both the apparent incubation period for crystallization and the overall crystallization time. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009