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Emulsion copolymerization of vinylidene fluoride (VDF) with perfluoromethyl vinyl ether (PMVE)
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020/02/27 , DOI: 10.1039/d0py00059k Fernando Reis da Cunha 1, 2, 3, 4, 5 , Irina Davidovich 6, 7, 8, 9 , Yeshayahu Talmon 6, 7, 8, 9 , Bruno Ameduri 1, 2, 3, 4, 5
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020/02/27 , DOI: 10.1039/d0py00059k Fernando Reis da Cunha 1, 2, 3, 4, 5 , Irina Davidovich 6, 7, 8, 9 , Yeshayahu Talmon 6, 7, 8, 9 , Bruno Ameduri 1, 2, 3, 4, 5
Affiliation
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The radical emulsion copolymerization of vinylidene fluoride (VDF) with perfluoromethyl vinyl ether (PMVE), initiated by potassium persulfate in the presence or absence of a surfactant is presented. The surfactant used in this copolymerization was 3-hydroxy-2-trifluoromethyl propanoic acid (MAF-OH). The VDF mol% ranged between 60 and 90 mol%. Molar masses up to 103 000 g mol−1 with wide dispersities (Đ > 2) were produced with yields up to 74%. The composition of the resulting poly(VDF-co-PMVE) copolymers was determined by 19F NMR spectroscopy. Under certain conditions (60% VDF mol% in the autoclave inlet, MAF-OH and a low total monomer concentration), the produced latexes were stable and showed an average particle size of ca. 200 nm, as observed using a Zetasizer and a cryo-TEM. Semi-crystalline copolymers were obtained when the VDF mol% was higher than 80 mol%. These copolymers exhibit high thermostability (their degradation under air started at 400 °C). A central point 23 factorial experimental design was conducted aiming at the identification of the influence of the parameters on the reaction and the end-use properties of the polymers. Most of the studied properties were highly influenced by the VDF mol%. The highest molar mass was obtained using 90 mol% VDF in the feed, no surfactant, and a total monomer molar amount of 208 mmol, while the highest dispersity was obtained using 60 mol% VDF in the feed, no surfactant, and a total monomer molar amount of 208 mmol.
中文翻译：
偏二氟乙烯（VDF）与全氟甲基乙烯基醚（PMVE）的乳液共聚
提出了在存在或不存在表面活性剂的情况下，由过硫酸钾引发的偏二氟乙烯（VDF）与全氟甲基乙烯基醚（PMVE）的自由基乳液共聚。在该共聚中使用的表面活性剂是3-羟基-2-三氟甲基丙酸（MAF-OH）。VDF摩尔％在60至90摩尔％的范围内。摩尔质量高达103000克摩尔-1宽分散度（Đ > 2）与生成物的收率高达74％。通过19 F NMR光谱法确定所得的聚（VDF-共-PMVE）共聚物的组成。在某些条件下（高压釜入口中VDF mol％为60％，MAF-OH和总单体浓度较低），制得的胶乳稳定且平均粒径为ca. 使用Zetasizer和cryo-TEM观察到的200 nm。当VDF摩尔％高于80摩尔％时，获得半结晶共聚物。这些共聚物表现出高的热稳定性（它们在空气中从400°C开始降解）。进行了中心点2 3析因实验设计，旨在确定参数对反应和聚合物最终用途性能的影响。VDF mol％对大多数研究性能有很大影响。使用进料中的90 mol％VDF，无表面活性剂和总单体摩尔量为208 mmol获得最高的摩尔质量，而使用进料中的60 mol％VDF，无表面活性剂和总单体获得最高的分散度摩尔量为208mmol。
更新日期：2020-03-31
中文翻译：
偏二氟乙烯（VDF）与全氟甲基乙烯基醚（PMVE）的乳液共聚
提出了在存在或不存在表面活性剂的情况下，由过硫酸钾引发的偏二氟乙烯（VDF）与全氟甲基乙烯基醚（PMVE）的自由基乳液共聚。在该共聚中使用的表面活性剂是3-羟基-2-三氟甲基丙酸（MAF-OH）。VDF摩尔％在60至90摩尔％的范围内。摩尔质量高达103000克摩尔-1宽分散度（Đ > 2）与生成物的收率高达74％。通过19 F NMR光谱法确定所得的聚（VDF-共-PMVE）共聚物的组成。在某些条件下（高压釜入口中VDF mol％为60％，MAF-OH和总单体浓度较低），制得的胶乳稳定且平均粒径为ca. 使用Zetasizer和cryo-TEM观察到的200 nm。当VDF摩尔％高于80摩尔％时，获得半结晶共聚物。这些共聚物表现出高的热稳定性（它们在空气中从400°C开始降解）。进行了中心点2 3析因实验设计，旨在确定参数对反应和聚合物最终用途性能的影响。VDF mol％对大多数研究性能有很大影响。使用进料中的90 mol％VDF，无表面活性剂和总单体摩尔量为208 mmol获得最高的摩尔质量，而使用进料中的60 mol％VDF，无表面活性剂和总单体获得最高的分散度摩尔量为208mmol。
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