PEO-PPO可聚合型大分子乳化剂的合成及应用

甲醇为起始剂,与萘钾反应转化为醇钾,以醇钾为引发剂依次引发环氧乙烷(EO)、环氧丙烷(PO)阴离子开环聚合,合成环氧乙烷-环氧丙烷(PEO-PPO)两嵌段共聚物,然后用甲基丙烯酰氯(MAC)为封端剂对该嵌段共聚物进行封端,得到可聚合型大分子乳化剂(PEO-PPO-MA),其中聚环氧乙烷部分为亲水链段,聚环氧丙烷部分为疏水链段。采用GPC1、H-NMR对PEO-PPO-MA的结构进行了表征,并用表面张力法测定了PEO-PPO-MA的临界胶束浓度(CMC)值。以合成的可聚合型大分子聚合物作为乳化剂直接进行苯乙烯的乳液聚合,研究了加料方式对乳液聚合的影响。结果表明,聚合所得乳液粒径均匀,且在加入乙醇、MgSO4及冻融条件下均具有很好的稳定性。

Synthesis and applications of a poly (ethylene oxide)-poly (propylene oxide) reactive emulsifier

A procedure to prepare reactive macromolecular emulsifiers is presented.The synthesis involved the initiation of anionic ring-opening polymerization of ethylene oxide and propylene oxide(to give the hydrophilic part and the hydrophobic part,respectively) by potassium methoxide prepared from the reaction of potassium naphthalene and methanol,and the resulting macromolecular anion was then reacted with methacryloyl chloride to afford the emulsifier.The product was characterized by gel permeation chromatograph...