CALCULATION OF MOLECULAR INTERNAL ROTATING STERIC FACTOR OF FLUOROPOLYMERS BY RADIATION CROSSLINKING METHOD

CALCULATION OF MOLECULAR INTERNAL ROTATING STERIC FACTOR OF FLUOROPOLYMERS BY RADIATION CROSSLINKING METHOD 1 first-author Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, China Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, China In this paper, the relationship between radiation crosslinking parameter β and the molecular internal rotating steric factor ( σ ) for fluoropolymers were studied. An expression calculating the molecular internal rotating steric factor of fluoropolymers, σ = 1.44+( β -0.206)/1.946, was established. σ value obtained by this method is in agreement with that given in the literature. Radiation crosslinking parameter of fluoropolymers Molecular internal rotating steric factor Radiation crosslinking of polymer REFERENCES Zhang Wanxi et al ., Chinese Science Bulletin , 3 ( 1986 ), 189 . Chinese Science Bulletin V.P. Privalko and Yu. S. Lipatov , J. Macromol. Sci. Phys , B9 ( 1974 ), 3 : 551 . J. Macromol. Sci. Phys He Tianbai , Polymeric Letters (in Chinese) , 6 ( 1983 ), 427 . Polymeric Letters (in Chinese) R.F. Boyer and R.L. Miller , Rubber Chem. Technol. , 50 ( 1977 ), 778 . Rubber Chem. Technol. Zhang Wanxi et al ., Journal of Radiation Research and Radiation Processing (in Chinese) , 4 ( 1986 ), 3 : 35 . Journal of Radiation Research and Radiation Processing (in Chinese) G. Kojima and Y. Tabata , J. Macromol. Sci. - Chem. , A5 ( 1971 ), 6 : 1087 . J. Macromol. Sci. - Chem. The project was supported by the research foundation of IAEA, Agency Research Contract No. 4316/RB. 1991-11-01 2021-02-05 1991 Nuclear Science and Techniques 4 2