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丙烯酸丁酯是丙烯酸酯共聚物中提供成膜性与粘附性能的主要结构单元。采用活性/可控自由基聚合,将丙烯酰胺与之共聚形成AB型两嵌段共聚物,将有利于改善丙烯酸酯聚合物在水性体系中的分散性能和在天然纤维等物质表面的粘附性能。以过硫酸钾/溴化铜/五甲基二乙烯三胺为引发-催化体系,在乳液中引发丙烯酸丁酯(BA)、丙烯酰胺(AM)依次进行反向原子转移自由基聚合(RATRP),得到P(BA-b-AM)乳液。采用红外光谱1、H-NMR,GPC表征共聚物结构和分子量及其分布。探讨了催化剂/配体比例、碱性盐对聚合物分子量分布的调控作用。
Butyl acrylate is the main structural unit that provides film-forming and adhesion properties in acrylate copolymers. Copolymerization of acrylamide with AB to form an amphiphilic diblock copolymer with living / controlled free radical polymerization will improve the dispersibility of acrylate polymers in aqueous systems and the adhesion on the surface of natural fibers . In the presence of potassium persulfate / copper (bromide) / pentamethyldiethylenetriamine as initiating-catalysis system, BA and AM were initiated in the emulsion to undergo reverse atom transfer radical polymerization (RATRP) , To obtain P (BA-b-AM) emulsion. The structure, molecular weight and distribution of copolymer were characterized by FTIR1, H-NMR and GPC. The effects of catalyst / ligand ratio and basic salt on the molecular weight distribution of the polymer were discussed.