Determination of molar mass distribution of poly(tetrafluoroethylene)
Determination of molar mass distribution of poly(tetrafluoroethylene)
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聚四氟乙烯摩尔质量分布的测定
DOI：
10.1002/masy.19920610129
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发表时间：
1992
影响因子：
--
通讯作者：
Chi Wu
中科院分区：
文献类型：
--
作者：
Chi Wu
在解决了以下实验难点后，完成了聚四氟乙烯在全氟四烷中的高温静态和动态激光散射表征：(1)构建可在340℃高温下工作的高温激光散射光谱仪；(2)研制新型全玻璃溶解滤光装置；(3)在325℃下测量聚四氟乙烯在全氟四烷中的折射率增量；(4)建立两种广泛分布的聚四氟乙烯样品在无限稀释和零散射角下的分子量(M)与平动扩散系数之间的标度关系，从而将平动扩散系数的分布转化为分子量的分布。本文综述了已发表的聚四氟乙烯表征的研究成果，重点介绍了高温激光散射的实验细节以及从平动扩散系数分布到分子量分布的转化原理。
High-temperature static and dynamic laser light scattering characterization of polytetrafluoroethylene in perfluorotetracosane has been accomplished after solving the following experimental difficulties: (1) constructing a high-temperature laser light scattering spectrometer which can be operated at a temperature as high as 340 °C, (2) developing a new all-glass apparatus for dissolving and filtering, (3) measuring the refractive index increment of polytetrafluoroethylene in perfluorotetracosane at 325 °C, and (4) establishing a scaling relation between the molecular weight (M) and the translational diffusion coefficient at both infinite dilution and the zero scattering angle from only two broadly distributed polytetrafluoroethylene samples so that we can convert the translational diffusion coefficient distribution to the molecular weight distribution. This paper presents a summary of our published results of the characterization of poly(tetrafluoroethylene), which emphasizes the experimental details of high-temperature laser light scattering and the principle of the transformation from a translational diffusion coefficient distribution to a molecular weight distribution.