摘要
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。
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 chromatography （GPC） and ^1H NMR, and the critical micellar concentration was also measured by surface tension. The emulsifier was used in the emulsion polymerization of styrene, and the effect of different ways of feeding it to the emulsion polymerization was studied. The latexes obtained from the polymerization process have quite narrow particle size distribution, and are stable to electrolytes, freeze-thaw cycles and organic solvents such as ethanol and acetone.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期64-67,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
关键词
阴离子开环聚合
聚环氧乙烷-b-聚环氧丙烷
可聚合型乳化剂
乳液聚合
anionic ring-opening polymerization
poly （ ethylene oxide） -b-poly （ propylene oxide） （PEO-PPO）
polymerizable emulsifier
emulsion polymerization
