Conformational Ordering on the Growth Front of Isotactic Polypropylene Spherulite
Conformational Ordering on the Growth Front of Isotactic Polypropylene Spherulite
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DOI：
10.1021/ma301595k
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发表时间：
2012-10
期刊：
影响因子：
5.5
通讯作者：
Yuanhua Cong;Zhihua Hong;Weiming Zhou;Wei Chen;Fengmei Su;L. Hailong;Xiangyang Li;Kehua Yang
中科院分区：
文献类型：
--
作者：
Yuanhua Cong;Zhihua Hong;Weiming Zhou;Wei Chen;Fengmei Su;L. Hailong;Xiangyang Li;Kehua Yang
采用常规源红外显微光谱（CS-μIR）、偏振红外显微光谱成像（SR-μPIR）和扫描X射线显微衍射（SR-μSXRD）等一系列原位微区分析技术研究了等规聚丙烯（iPP）球晶的生长前沿。利用SR-μSXRD，明确了球晶的实际生长前沿边界，即用光学显微镜观察到的边界。对生长球晶的CS-μIR和SR-μPIR测量表明，在142 °C以上，在球晶生长前沿外存在一个高含量的构象有序长螺旋的生长前沿层（GFL），其厚度可达30 μm。这些长螺旋优先垂直于球晶的径向取向，其生长方式似乎与球晶的生长有关。
The growth front of isotactic polypropylene (iPP) spherulites is studied with series of in-situ microanalyzing techniques: conventional source infrared microspectroscopic (CS-μIR), polarized infrared microspectroscopic imaging (SR-μPIR), and scanning X-ray microdiffraction (SR-μSXRD). By SR-μSXRD, the actual growth front boundary of spherulite was clearly defined, which is the boundary observed with an optical microscope. Measurements of CS-μIR and SR-μPIR on growing spherulites reveal that a growth front layer (GFL) with high content of conformational ordered long helices exists outside the growth front of spheurlite, which has a thickness up to 30 μm above 142 °C. These long helices preferentially orient perpendicular to the radial direction of spherulite, whose growth fashion seems correlating with the growth of spherulite.