【摘要】 用亨利定律关联了四氟乙烯 (TFE) /偏氟乙烯 (VDF)乳液共聚合体系中的单体气相分压与其对应液相浓度间的关系 ,推导了用气相摩尔分数表示的共聚物组成方程式 .通过气相色谱和19F NMR分别测定了共聚反应前后气相单体组成和共聚物组成 ,用非线性回归法 (RREVM )计算TFE/VDF乳液共聚合反应表观竞聚率分别为γTFE=0 35和γVDF=0 6 3 .将实测的表观竞聚率代入共聚物组成方程计算共聚物组成与由19F NMR测定的结果一致 ,为进一步的工业放大试验提供科学依据更多还原

【Abstract】 The monomer reactivity ratio (mrr) of emulsion copolymerization of tetrafluoroethene (TFE) with vinylidene fluoride (VDF) was examined and studied at relatively low pressure.In this study with the general pressure less than 1.53MPa,Henry’s law was applied well to relate the monomer concentration in the liquid phase and the mole fraction in the gas phase.In this case,the copolymer composition equation could be kept in the same way as Mayo\|Lewis equation after replacing the monomer concentration with gaseous mole fraction and the mrr with apparent mrr.The initial and the end monomer mole fractions were determined with gas chromatograph (GC) and the copolymer compositions were calculated from GC experimental data as well as from the data measured by using 19 F\|NMR.The apparent monomer reactivity ratio estimated from reactivity ratio error\|in variables model (RREVM) are 0.35 ( γ TFE ) and 0.63 ( γ VDF ) for TFE and VDF respectively.95% probability contour shows the experiment results of apparent mrr is accurate and the compositions of such copolymers ( F TFE ) calculated from the copolymer composition equation produced are in good agreement with those measured by means of 19 F\|NMR.更多还原