硅-丙共聚物微胶乳的合成及性能表征

Synthesis and Characteristics of Organ Silicon-Acrylate Copolymer Nanolatexes

通过连续乳液聚合方法合成了平均粒径59．8nm、粒径分布窄、固含量达42％的硅-丙微胶乳。考察了聚合温度、乳化刑用量、引发剂用量、功能性单体用量对乳液及乳胶膜性能的影响。FT—IR分析表明，丙烯酸酯和有机硅发生共聚；反应温度为80C～85℃时，得到的乳液的乳胶粒较小，而胶膜的吸水率随温度的升高而降低；乳化剂用量、引发剂用量、功能性单体MAA用量增加，胶膜吸水率增大；乳化剂用量为单体质量的4％、引发剂用量为单体质量的0．375％、MAA用量占单体质量的1％～2％时，乳液粒径最小；适量MAA的加入，可有效抑制反应过程中凝聚物的产生。

Organ silicon-acrylate copolymer nanolatexes with 59.8nm of average particle size with narrow size distribution and solid content 42% were prepared by continuous monomer addition method .The effects of reaction temperatures ,contents of emulsifier ,initiator and functional monomers on properties of nanolatex and its film were investigated .FT-IR spectrum shows that organ silicon reacts with acrylate to form copolymers.TEM shows that core-shell nanolatex is formed and the shell keeps the particle stability .Small size latex is obtained at 80℃-85℃,and water sorption decreases with reaction temperature increases.Water sorption increases with contents of emulsifier ,initiator and functional monomers increase.When emulsifiers,initiators and functional monomers are 4%,0.375% and 1%-2% based on total monomer content respectively ,the smallest particle size is obtained. Proper MAA can restrain crud effectively during emulsion polymeriztion.