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题名: In-situ investigation on the structural evolution of mesomorphic isotactic polypropylene in a continuous heating process
作者: Jiang, Qianhong1, 2; Zhao, Ying1; Zhang, Chunbo1, 2; Yang, Jian1, 2; Xu, Yizhuang3; Wang, Dujin1
关键词: Isotactic polypropylene ; Mesophase ; FTIR ; Meso-alpha transformation
刊名: POLYMER
发表日期: 2016-11-22
卷: 105, 页:133-143
收录类别: SCI
英文摘要: The microstructural changes of mesomorphic iPP from mesophase to alpha transition at a molecular level in a continuous heating process have been studied by in-situ Fourier-transform infrared (FT-IR) spectroscopy, in-situ X-ray scattering using synchrotron radiation, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Microstructural change corresponding to helical conformation variation in the temperature range between 20 and 60 degrees C was detected by IR spectroscopy, which may originate from the glass transition of rigid amorphous fraction (RAF). The helical sequence with 12 monomer units is found to exist in RAF. The contents of helical sequences with different number of monomers exhibit different variation trends in the course of meso-alpha transition and the following process of partial melting and perfection of alpha crystal. A plausible mechanism was proposed that RAF experiences glass transition firstly at low temperature, and then serve as a nuclei to trigger the meso-alpha transition at higher temperature. This work provides a new insight into the mechanism of microstructural evolution of the meso-alpha transformation of iPP. (C) 2016 Elsevier Ltd. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35716
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
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