新型耐温抗盐丙烯酰胺嵌段共聚物的研制

Preparation of a novel acrylamide block copolymer with temperature- and salt-resistance

以偶氮异二丁腈(AIBN)为引发剂、二硫代苯甲酸苄脂(BDTB)为链转移剂,采用可逆-加成断裂链转移(RAFT)自由基聚合法,制备新型低温亲水、高温部分疏水的丙烯酰胺-b-N,N-二乙基丙烯酰胺共聚物P(AM-b-DEA)。用FTIR和^(1)H NMR表征聚合物结构,考察了单体质量比、引发剂与链转移剂的用量比、引发剂与链转移剂总用量对聚合物溶液表观粘度的影响。对比了粘度最大的嵌段聚合物与其他聚合物溶液在不同温度、不同盐浓度下的粘度。结果表明,单体质量比为7∶2,引发剂与链转移剂质量比为1∶3,引发剂与链转移剂总用量为0.096 g,即引发剂与链转移剂用量分别为0.024 g、0.072 g时,合成的P(AM-b-DEA)嵌段共聚物溶液的粘度最大,相比于其他相似条件合成的聚合物溶液的耐温抗盐效果好。

P(AM-b-DEA) that is a designed polymer with hydrophilicity at low temperature and partially hydrophobicity at high temperature was synthesized by reversible-addition fragmentation chain transfer(RAFT) radical polymerization using azo-isodibutyronitrile(AIBN) as initiator and benzyl dithiobenzoate(BDTB) as chain transfer agent.The structure of polymer was characterized by FTIR and ^(1)H NMR.Effect of monomer mass ratio(m_(AM)∶m_(DEA)),the mass ratio of initiator to chain transfer agent(m_(AIBN)∶m_(BDTB)),total amount of AIBN and BDTB on the apparent viscosity of the polymer solution were investigated.The viscosity of block copolymer solutions with the highest viscosity and other polymer solutions at different temperatures and salt concentrations were also measured.The results show that when m_(AM)∶m_(DEA) is 7∶2,m_(AIBN)∶m_(BDTB) is 1∶3,the total amount of AIBN and BDTB is 0.096 g,that is,the amount of initiator and chain transfer agent is 0.024 g and 0.072 g respectively,the temperature resistance and salt resistance of P(AM-b-DEA) are stronger than other polymers synthesized under the similar conditions.