Preparation and properties of some water‐soluble, comb‐shaped, amphiphilic polymers
Preparation and properties of some water‐soluble, comb‐shaped, amphiphilic polymers
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DOI：
10.1002/pola.1989.080271204
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发表时间：
1989-11
期刊：
影响因子：
--
通讯作者：
B. Wesslén;K. Wesslén
中科院分区：
文献类型：
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作者：
B. Wesslén;K. Wesslén
通过酯交换反应将聚乙二醇单甲醚（MPEG）接枝到丙烯酸酯和甲基丙烯酸酯共聚物上，制备了梳状水溶性聚合物。接枝是碱催化的，并且在155°C下在甲苯溶液中或在熔体中进行。接枝效率被认为是1接枝/10单体单元的顺序。甲基丙烯酸缩水甘油酯共聚物中的环氧基也用于接枝。粗接枝共聚物通过色谱法纯化，并通过NMR和IR光谱进行表征。由MPEG 2000制备的聚合物是结晶的，熔点比所用MPEG低10-15°C。所有聚合物均显示出表面活性，CMC为1.5 g/L的量级，表面张力为38-45 dyn/cm。当用作乳化剂时，含有大体积亲油酯基（2-乙基己基叔丁基）的接枝共聚物从二甲苯/水得到水包油（o/w）和油包水（w/o）乳液，其稳定性高于含有直链酯基（甲基正丁基正十二烷基）的接枝共聚物。通过将聚合物溶解在有机相中获得最稳定的乳液。
Water-soluble comb-shaped polymers were prepared through grafting of poly(ethylene glycol) monomethyl ethers (MPEG) onto acrylic and methacrylic ester copolymers by transesterification reactions. The grafting was alkali-catalyzed, and performed in refluxing toluene solution or in melt at 155°C. The grafting efficiency was found to be on the order of 1 graft/10 monomer units. Epoxy groups in glycidyl methacrylate copolymers were also utilized for grafting. The crude graft copolymers were purified through chromatography and characterized by NMR and IR spectroscopy. Polymers prepared from MPEG 2000 were crystalline with melting points 10–15°C lower than the MPEG used. All polymers were shown to be surface active with CMC on the order of 1.5 g/L, and surface tensions of 38–45 dyn/cm. When used as emulsifiers the graft copolymers containing bulky lipophilic ester groups (2-ethylhexyl t-butyl) gave oil-in-water (o/w) and water-in-oil (w/o) emulsions from xylene/water with higher stability than those containing straight chain ester groups (methyl nbutyl n-docecyl). The most stable emulsions were obtained by dissolving the polymers in the organic phase.