表面活性单体NaAMC_(14)S/丙烯酰胺共聚物的分子链微结构与疏水缔合性

在实施丙烯酰胺型阴离子表面活性单体2-丙烯酰胺基十四烷磺酸钠(NaAMC14S)与丙烯酰胺(AM)水溶液均相共聚合过程中,分别通过改变AM与NaAMC14S的投料比、改变外加电解质NaCl的加入量以及引发剂的用量,制备了分子链微结构系列变化的具有微嵌段结构的共聚物NaAMC14S/AM;采用荧光探针法与表观粘度法研究了共聚物分子链微结构与其疏水缔合性能之间关系,探索了共聚物分子链中疏水微嵌段含量、疏水微嵌段长度及共聚物分子量诸微结构因数对共聚物疏水缔合性的影响.结果表明,共聚物NaAMC14S/AM的疏水缔合性随着疏水微嵌段含量的增加而增强,随着疏水微嵌段长度的增长而增强,当疏水微嵌段含量和嵌段长度一定时,共聚物的疏水缔合性随分子量的增大而增强.

MICROSTRUCTURE OF MACROMOLECULAR CHAINS AND HYDROPHOBIC ASSOCIATION PROPERTIES FOR COPOLYMERS OF SURFACE-ACTIVE MONOMER NaAMC14S AND ACRYLAMIDE

Hydrophobically associated polyacrylamide was synthesized by copolymerization of acrylamide(AM)and a surface-active monomer,sodium 2-acrylamidotetradecane sulfonate(NaAMC_ 14S),in an aqueous homogenous phase system.Based on the exploited copolymerization mechanism and by controlling the concentration of NaAMC_ 14S above its critical micelle concentration,copolymers NaAMC_ 14S/AM with microblocks structure were obtained.By varying the feed ratio of NaAMC_ 14S and AM,the added amount of electrolyte NaCl and the amount of initiator,respectively,thre series of copolymers NaAMC_ 14S/AM with various microstructures were prepared.The dependences of hydrophobic associating properties of the copolymers on the microstructures were studied by the fluorescence probe method and the apparent viscosity measurement method,and the effects of the content and length of the hydrophobic blocks and the molecular weight of the copolymers were explored thoroughly.The experimental results show that the hydrophobic associating properties of copolymers NaAMC_ 14S/AM is strengthened with the increase of the content and length of the hydrophobic blocks and is enhanced with the increase of the molecular weight of the copolymers.