分散聚合法制备乙二醇单苯醚-甲醛酚醛树脂聚合物微球

Preparation of Ethylene Glycol Monophenylether-Formaldehyde Polymer Microspheres via Dispersion Polymerization

以乙二醇单苯醚(EGP)和甲醛为单体、聚乙烯醇(PVA)为稳定剂、浓H2SO4为催化剂,经分散聚合合成了EGP-甲醛酚醛树脂(EGP-FA)聚合物微球,研究了PVA用量、甲醛与EGP配比、聚合温度、浓H2SO4用量和搅拌转速对聚合物微球粒径及其分布、产率的影响。实验结果表明,EGP-FA聚合物微球的平均粒径随PVA和浓H2SO4用量的增加、搅拌转速的加快和聚合温度的升高而减小,随n(甲醛)∶n(EGP)的增大先增大后减小。在适宜反应条件(n(甲醛)∶n(EGP)=2.00、w(PVA)=4.5%(基于甲醛和EGP的总质量)、w(H2SO4)=14.10%(基于甲醛和EGP的总质量)、聚合温度70℃、搅拌转速700 r/min)下制备的EGP-FA聚合物微球的平均粒径为384.16μm,粒径分布1.216,产率45.8%。

Ethylene glycol monophenylether（EGP）-formaldehyde（EGP-FA） polymer microspheres was prepared from ethylene glycol monophenylether and formaldehyde via dispersion polymerization,with polyvinyl alcohol（PVA） as stabilizer and concentrated H2SO4as catalyst.The effects of PVA dosage,the ratio of formaldehyde to EGP,temperature,concentrated H2SO4dosage and stirring rate on the particle size,size distribution and yield of EGP-FA polymer microspheres were investigated.Under the optimum conditions：n（formaldehyde）∶n（EGP） of 2.00,4.5%（w）PVA（based on the mass of EGP and formaldehyde）,14.10%（w）H2SO4（based on the mass of EGP and formaldehyde）,70 ℃ and 700 r/min stirring rate,the particle size,size distribution and yield of EGP-FA polymer microspheres were 384.16 μm,1.216 and 45.8%,respectively.