含孪尾型丙烯酰胺的HAPAM在新胶束聚合体系中的制备及其疏水缔合性

Preparing HAPAM Containing Twin Tail-Type Acrylamide in New Micellar Polymerization System and Relationship Between Its Chain Structure and Hydrophobic Associativity

以表面活性单体2-丙烯酰胺基十二烷磺酸钠(NaAMC12S)为表面活性剂构建了新的胶束共聚合体系,实施了丙烯酰胺(AM)与N,N-二正十二烷基丙烯酰胺(DiC12AM)的胶束共聚合,制备了含孪尾型丙烯酰胺的疏水缔合聚丙烯酰胺(HAPAM),该聚合物为三元共聚物DiC12AM/NaAMC12S/AM。通过控制共聚合条件,制得了微结构系列变化的共聚物;采用红外光谱法表征了三元共聚物的化学结构,用荧光探针法与表观粘度法重点研究了共聚物DiC12AM/NaAMC12S/AM的大分子链微结构与其疏水缔合性的关系。结果表明:新胶束共聚合体系大大简化了胶束的共聚合操作,而且由于表面活性单体进入共聚物主链,使三元共聚物DiC12AM/NaAMC12S/AM具有更强的疏水缔合性。与由单尾型丙烯酰胺N-正十二烷基丙烯酰胺(C12AM)为疏水单体制备的HAPAM相比,由DiC12AM制得的HAPAM疏水缔合性更为显著。

A new micellar copolymerization system was constructed using sodium 2-acrylamido-dodecane sulfonate （NaAMC12S） as a surfactant, and the copolymer of acrylamide （AM） and a twin tail-type acrylamide N, N-didodecylacrylamide （DiC12 AM） was performed. Hydrophobically associating polyacrylamide （HAPAM） containing twin tail-type acrylamide was obtained as a terpolymer, DiC12 AM/NaAMC12 S/AM. The relationship between the chain microstructure and hydrophobic associativity for the terpolymer DiC12AM/NaAMC12S/AM was studied with fluorescent probe technique and apparent viscosity measurement. The experimental results show that the polymerization process in the new micellar polymerization system can be simplified greatly. As compared with bipolymer DiC12 AM/AM prepared in conventional micellar copolymerization system with SDS, the terpolymer DiC12 AM/NaAMC12 S/AM has stronger hydrophobic association property owing to the incorporation of NaAMC12 S. HAPAM that containing twin tail-type acrylamide DiC12 AM has much stronger hydrophobic association property than HAPAM that containing mono-substituted acrylamide, N-dodecylacrylamide （C12AM）.