WEN Jian-xun, LU Mei-li, Li Jin-tang. THE MOLECULAR MOTIONS OF COPOLYMERS OF TETRAFLUOROETHYLENE AND PERFLUORO-4-METHYL-3,6-OXA-△7-OCTYL-SULFONYL FLUORIDE[J]. Acta Polymerica Sinica, 1981,(4):296-301.
WEN Jian-xun, LU Mei-li, Li Jin-tang. THE MOLECULAR MOTIONS OF COPOLYMERS OF TETRAFLUOROETHYLENE AND PERFLUORO-4-METHYL-3,6-OXA-△7-OCTYL-SULFONYL FLUORIDE[J]. Acta Polymerica Sinica, 1981,(4):296-301.DOI:
The moleeuar motions of eopolymers of tetrafluoroethylene and perfluoro-4-methyl-3.6-oxa-△7-octyl.sulfonyl fluoride have been determined from --150℃ --80℃ using vibrating reed device.The materials are partly crystalline perfluorinated copolymers containing different amount of side ehains.Four relaxations are observed,labeled a,y1,γ2,and γ3 in order of decreasing temperature.The α-relaxation (room temperature) is assigned to the glass transition,γ1-relaxation (--50℃,215Hz) to hindered motion of main chains,γ2-relaxation( --60℃,230Hz) to side chain motions.The γ3-relaxation (--77℃,260Hz) is assigned to short segments of main chains (CF2)x motions and its intensity increases with annealing.