Hydrogen Peroxide Induced Efficient Mineralization of Poly(vinylidene fluoride) and Related Copolymers in Subcritical Water

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• 作者：Hisao Hori ; Hirotaka Tanaka ; Kengo Watanabe ; Takahiro Tsuge ; Takehiko Sakamoto ; Abdellatif Manseri ; Bruno Ameduri
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：54
• 期：35
• 页码：8650-8658
• 全文大小：426K
• ISSN：1520-5045

文摘

Decompositions of poly(vinylidene fluoride) (PVDF), poly(vinylidene fluoride-co-chlorotrifluoroethylene) copolymer (poly(VDF-co-CTFE)), and poly(vinylidene fluoride-co-hexafluoropropylene) copolymer (poly(VDF-co-HFP)) in subcritical water were investigated with the aim of developing a technique to recover the fluorine component. By use of H₂O₂, these (co)polymers can be efficiently mineralized at a relatively low temperature (300 掳C). When PVDF was heated with 3.0 M H₂O₂ for 6 h, which corresponds to 31 times the molar amount of fluorine and 32 times the molar amount of carbon in the polymer, both F^{鈥?/sup> and CO₂ yields reached 98%. Poly(VDF-co-CTFE) copolymer was also mineralized under the same reaction conditions (the yields of F鈥?/sup>, CO₂, and Cl鈥?/sup> were 98, 95, and 97%, respectively). Poly(VDF-co-HFP) copolymer was more readily decomposed than poly(VDF-co-CTFE), leading to almost complete mineralization (F鈥?/sup> yield, 96%; CO₂ yield, 92%) with 2.0 M H₂O₂. Addition of stoichiometric Ca(OH)₂ to the reactions formed CaF₂ well-identified by X-ray diffraction spectrometry.}