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Citation: XU Wei-Jian, LÜ Bin-Jie, SHAO Guo-Yin. Modification of Poly(vinylidene fluoride) by Free Radical Chlorination[J]. Chinese Journal of Applied Chemistry, ;2003, 20(1): 29-33. shu

Modification of Poly(vinylidene fluoride) by Free Radical Chlorination

1.
College of Chemistry and Chemical Engineering, Hu'nan University, Changsha 410082

Corresponding author: XU Wei-Jian,
Received Date: 17 March 2002
Available Online: 5 September 2002
Fund Project: 教育部高校骨干教师资助计划(教技司(200)65号) (教技司(200)65号)

Poly(vinylidene fluoride)(PVDF) has been modified by free radical chlorination. The effects of reaction conditions on chlorination degree, including chlorine gas flow rate, initiator concentration, dispersing medium, reaction temperature and time were investigated. The chlorinated PVDF was characterized by chemical titration and ¹H NMR. Its solubility, adhesivity, softening point, contact angle and thermal property were measured. The results show that the chlorination degree of PVDF could be controlled in the range of 1%~16.3%. With the increase of chlorination degree the melting point of PVDF decreased from 163℃ to 130℃; the contact angle with H₂O decreased from 90° to 54°. The polymers containing more than 6% chlorine were soluble in acetone. The solubility parameters to methanol and tetrachloro-methane were changed. The chlorinated PVDF appeared to be less stable than PVDF, but its decomposion temperature was yet above 300℃.
- poly(vinylidene fluoride),
- free radical,
- chlorination
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