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首页> 外文期刊>Journal of Applied Polymer Science >Emulsion copolymerization of tetrafluoroethylene with ω- chlorotetrafluoroethyltrifluorovinyl ether and the synthesized copolymer properties
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Emulsion copolymerization of tetrafluoroethylene with ω- chlorotetrafluoroethyltrifluorovinyl ether and the synthesized copolymer properties

机译：四氟乙烯与ω-氯四氟乙基三氟乙烯基醚的乳液共聚反应及其合成性能

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摘要

Emulsion copolymerization of ω-chlorotetrafluoroethyltrifluorovinyl ether (Cl(CF_2)_2OCF = CF_2 (FVE)) with tetrafluoroethylene (CF_2 = CF_2 (TFE)) was investigated at various monomer ratios. The copolymerization rate is below the rate of TFE homopolymerization and the copolymerization kinetics depends on the FVE content in the reaction medium. The copolymer composition is very similar if the FVE content in monomer mixture is ≤2.5 mol %. However, the percent amount of FVE in the copolymer, the copolymerization rate, and molecular mass of synthesized copolymers decrease noticeably with increase in the FVE content in the monomer mixture. The constants of copolymerization are r_1 = 2.8 (TFE) and r_2 = 0.03 (FVE). The copolymer is a statistical polymer consisting of TFE blocks and individual FVE molecules between the blocks. The average molecular mass of copolymers is significantly less than that of the TFE homopolymer (PTFE) synthesized at the same conditions. The morphologies of PTFE and copolymer powders were investigated by thermomechanical analysis and are not similar. The copolymer has a completely amorphous diblock morphology depending on the FVE content. The introduction of FVE molecules into the copolymer macromolecules is accompanied by reduction of the crystalline portion of copolymer. If the FVE content in copolymer is ≥3.5 mol %, the copolymer macromolecules completely lose the ability to form crystalline portions as a result of their amorphicity. The introduction of up to 2.4 mol % FVE into the copolymer macromolecules yields a highly thermostable and meltable copolymer which can be processed by using the industrial processes used widely for thermoplastics.
机译：研究了ω-氯四氟乙基三氟乙烯基醚（Cl（CF_2）_2OCF = CF_2（FVE））与四氟乙烯（CF_2 = CF_2（TFE））的乳液共聚。共聚速率低于TFE均聚速率，并且共聚动力学取决于反应介质中的FVE含量。如果单体混合物中的FVE含量≤2.5摩尔％，则共聚物组成非常相似。然而，随着单体混合物中FVE含量的增加，共聚物中FVE的百分数，共聚速率和合成共聚物的分子量显着降低。共聚常数为r_1 = 2.8（TFE）和r_2 = 0.03（FVE）。该共聚物是统计聚合物，由TFE嵌段和嵌段之间的单个FVE分子组成。共聚物的平均分子量明显小于在相同条件下合成的TFE均聚物（PTFE）的平均分子量。 PTFE和共聚物粉末的形貌通过热力学分析进行了研究，并不相似。取决于FVE含量，该共聚物具有完全无定形的二嵌段形态。将FVE分子引入共聚物大分子伴随着共聚物结晶部分的减少。如果共聚物中的FVE含量≥3.5mol％，则共聚物大分子由于其非晶性而完全丧失形成结晶部分的能力。将高达2.4mol％的FVE引入到共聚物大分子中，产生了高度热稳定和可熔融的共聚物，其可以通过使用广泛用于热塑性塑料的工业方法来加工。

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