SET-LRP法制备星型疏水缔合水溶性聚合物

采用丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸钠(NaAMPS)以及N-叔丁基丙烯酰胺(NtBA)为共聚单体,以Cu~0粉/三(2-二甲氨基乙基)胺(Me_6-TREN)为催化体系,四氯化碳(CCl_4)为引发剂,利用单电子转移自由基聚合(SET-LRP)方法合成星型疏水缔合水溶性聚合物P(AM/NtBA/NaAMPS)。采用控制变量法分别考察了引发温度、疏水单体含量、AMPS含量、引发剂用量、催化剂铜、单体浓度等因素对聚合物相对分子质量的影响,确定了最佳聚合条件并考察了聚合物的耐温抗盐性能。结果表明,当单体浓度为35%,引发温度为25℃,AM、AMPS、NtBA分别占单体总量的93.6%、5%、1.4%(摩尔比),引发剂质量分数为0.4942%,催化剂铜的质量分数为0.0848%,钝化剂的质量分数为0.1192%时,所得星型疏水缔合水溶性聚合物P(AM/NtBA/NaAMPS)的相对分子质量出现最高值为267万,同时具有一定的耐温抗盐性,其溶液性能与线型化的P(AM/NtBA/NaAMPS)相似,且在相同浓度下CaCl_2对聚合物表观粘度的影响比NaCl大。

Synthesis of Star-shaped Hydrophobically Associating Water-soluble Polymer via SET-LRP

Star-shaped Hydrophobically Associating Water-soluble Polymer(P(AM/NtBA/NaAMPS))was prepared by single electron transfer living radical polymerization (SET-LRP)with acrylamide (AM),sodium 2-acrylamido-2-methylpropane sulfonate (NaAMPS)and N-tert-butylacrylamide (NtBA)as comonomer,Cu0 powder and Me6-TREN as catalytic system and CCl4 as multifunctional initiator.Effects of the initiation temperature,hydrophobic monomer dosage,AMPS dosage,initiator dosage,catalyst dosage and monomer concentration on molecule weight were investigated by Control variable method.The optimum synthesis conditions were determined and the solution properties were investigated.The results show that as the acrylamide(AM) content is 93.6％ (mol)in total monomer,2-Acrylamide-2-methylpro panesulfonic acid (AMPS)content is 5％,N-tert-butylacrylamide (NtBA)content is 1.4％.And as the monomer concentration is 35％,the reaction temperature is 25.0℃,the mass fraction of initiator is 0.4942％,the amount of catalyst is 0.0848％,the deactivation agent is 0.1192％,the maximum molecular weight of the star-shaped hydrophobically associating water-soluble polymer can reach up to 2.67× 106.The polymer have temperature resistance and salt tolerance,and the solution property of star-shaped hydrophobically associating water-soluble polymers was similar to the line-shaped polymer.In addition,the effect of CaCl2 on the apparent viscosity of the hydrophobically associating polyacrylamide was more significant than NaCl.