偏氟乙烯分散聚合的成核及初级粒径

Nucleation and Primary Particle Diameter of Vinylidene Fluoride by Dispersion Polymerization

摘要: 以分散聚合的相关成核理论为基础，采用核磁共振（19F-NMR）和傅里叶红外分析（FT-IR）等分析方法研究了偏氟乙烯（VDF）分散聚合的成核机理，并确认了以低聚物成核机理为其主要形式。同时，通过实验确定了PVDF乳胶粒粒径(d)与转化率（X)、反应压力(p)、初始引发剂质量浓度(ρI,0)以及初始乳化剂质量浓度(ρS，0)有着如下关系：d∝X0.36p1.20ρ-0.76I,0ρ-0.33S,0。在各个因素中，反应压力（或单体质量浓度）的影响程度最大。

Abstract: Based on the nucleation theory of dispersion polymerization, the oligomer nucleation as the main mechanism in the dispersion polymerization of vinylidene fluoride (VDF) was identified using 19F-NMR and FT-IR. The relationship between VDF conversion ratio (X), the reaction pressure (p), initial initiator mass concentration (ρI,0), initial surfactant mass concentration (ρS,0) and PVDF latex particle size (d) was identified as d∝X0.36p1.20ρ-0.76I,0ρ-0.33S,0, among which reaction pressure (or monomer mass concentration) was the most effective factor.