| 乙烯-四氟乙烯共聚物平均分子量及其分布的动态流变法测定 |
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| 引用本文： | 占晓强,包永忠,黄志明,王树华. 乙烯-四氟乙烯共聚物平均分子量及其分布的动态流变法测定[J]. 高分子材料科学与工程, 2011, 0(2): 122-125 |
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| 作者姓名： | 占晓强 包永忠 黄志明 王树华 |
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| 作者单位： | 浙江大学化学工程与生物工程学系化学工程国家重点实验室;巨化集团公司国家氟材料工程技术研究中心; |
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| 基金项目： | 国家科技支撑计划项目课题资助(2007BAE50B01) |
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| 摘 要： | 针对溶液法测定乙烯-四氟乙烯共聚物(ETFE)平均分子量及其分布的困难,文中建立了由动态流变法测定ETFE平均分子量及其分布的改进方法.采用Carreau-Yasuda方程拟合复数黏度与频率(ω)的关系,得到零剪切黏度并计算分子量.采用广义Maxwell模型拟合动态模量与ω的关系,得到平台模量G<'O><,N>;根据粘...
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| 关 键 词： | 乙烯-四氟乙烯共聚物 分子量及其分布 黏度 动态模量 |
Determinations of Mean Molecular Weight and Molecular Weight Distribution of Ethylene-Tetrafluoroethylene Copolymers by Dynamic Rheological Method |
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| Xiaoqiang Zhan,Yongzhong Bao,Zhiming Huang,Shuhua Wang. Determinations of Mean Molecular Weight and Molecular Weight Distribution of Ethylene-Tetrafluoroethylene Copolymers by Dynamic Rheological Method[J]. Polymer Materials Science & Engineering, 2011, 0(2): 122-125 |
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| Authors: | Xiaoqiang Zhan Yongzhong Bao Zhiming Huang Shuhua Wang |
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| Affiliation: | Xiaoqiang Zhan1,Yongzhong Bao1,Zhiming Huang1,Shuhua Wang2(1.Department of Chemical and Biological Engineering,State Key Laboratory of Chemical Engineering,Zhejiang University,Hangzhou 310027,China,2.National Technology Center of Fluoro-Material,Juhua Group Corporation,Quzhou 324004,China) |
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| Abstract: | It is difficult to determine the mean molecular weight(M-w) and molecular weight distribution(MWD) of ethylene/tetrafluoroethylene copolymers(ETFE) by gel permeation in chromatography(GPC) method since ETFE can hardly be dissolved in the common solvents.The dynamic rheological method was applied to measure the M-w and MWD of ETFE,and the treatment method proposed by Tuminello was modified.The measured complex viscosity～frequency(ω) results were fitted by using Carreau-Yasuda equation to obtain the zero shear viscosity,which was further used to calculate the mass average molecular weight of ETFE.The generalized Maxwell model was applied in fitting the relationships between dynamic modulus(G′ and G″) and ω,to obtain the plateau modulus(G0N),and the parameter k2 in the equation of τ=1/ω=K2M3.4w was deduced as K2=12/π2×K1/G0N through the viscoelastic theory.MWD calculated from the dynamic modulus-ω relationship was narrow due to the limited range of ω,and the deviation was existed between the M-w determined by the complex viscosity-ω and dynamic modulusω relationships. |
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| Keywords: | ethylene-tetrafluoroethylene copolymer mean molecular weight and molecular weight distribution viscosity dynamic modulus |
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