Perturbing effects of bulky comonomers on the chain conformation of poly(vinylidene fluoride)

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• 作者：Yuning Yang ; Suriyakala Ramalingam ; Guolin Wu ; Shaw Ling Hsu ; Lothar W. Kleiner ; Fuh-Wei Tang ; Nadine Ding ; Syed Hossainy
• 关键词：Amorphous ; Conformation ; Fluorinated
• 刊名：Polymer
• 出版年：2008
• 出版时间：1 April 2008
• 年：2008
• 卷：49
• 期：7
• 页码：1926-1933
• 全文大小：555 K

文摘

The comonomer effect on the structures of poly(vinylidene fluoride–hexafluoropropylene) P(VDF–HFP) copolymers was analyzed by Raman spectroscopy. The HFP content of these copolymers varies from 5 % to 15 % . Because of steric interactions involving the bulky HFP comonomers, the predominant chain conformation has extensively more gauche conformers in comparison to the neat PVDF. Based on both experimental and simulation studies, specific spectroscopic features in the 400–900 cm⁻¹ region have been identified that are characteristic of irregular chain conformations elucidating the perturbing effect of HFP on the equilibrium chain statistics of PVDF in the amorphous phase. In addition, these spectroscopic features were revealed to be extremely sensitive to the relative placements of the CF₃ units with respect to other fluorine atoms along the chain.