Chain structure and stiffness of Teflon AF glassy amorphous fluoropolymers

被引:24
作者
Tokarev, A. V. [1 ]
Bondarenko, G. N. [1 ]
Yampol'skii, Yu. P. [1 ]
机构
[1] Russian Acad Sci, Topchiev Petrochem Synth Inst, Moscow 119991, Russia
关键词
D O I
10.1134/S0965545X0708007X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The structure of the amorphous perfluorinated polymer Teflon AF 2400 and other structurally close perfluoropolymers was studied by means of a quantum chemistry method. The electronic and structural characteristics of the repeating unit and polymer models with ten and nine monomer units were obtained. It was found that two nonplanar isomers can exist for different models of the perfluorinated dioxole ring with a difference of their energy minimums of 10.8 kJ/mol. The orthogonal-block structure of the polymer chain of the perfluorodioxole homopolymer and its copolymer with tetrafluoroethylene was proposed, the block size was found, and a possible diameter of the void formed by two neighboring polymer chains was evaluated. Potential energy curves for the rotation of certain chain fragments about different bonds of the polymer main chain were constructed, and the polymer stiffness was shown to substantially depend on the molar ratio between perfluorodioxole and tetrafluoroethylene units in the copolymer and on the geometry of the perfluorodioxole ring.
引用
收藏
页码:909 / 920
页数:12
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