摘要
以苯乙烯(St)和丙烯酸(AA)为单体,二硫代苯甲酸苄酯为链转移剂,偶氮二异丁腈(AIBN)作为引发剂,采用可逆加成-断裂链转移(RAFT)活性自由基聚合法,合成了超分散剂聚苯乙烯-b-聚丙烯酸(PS-b-PAA)。研究结果表明,制得的共聚物分子量分布为1.1～1.3,聚合反应在80℃下24 h内转化率达95%,PS-b-PAA分散剂使CaCO3粉体在水体系中的稳定性、分散性和均匀性都有显著提高,加入分散剂的浓度以2g/L时为最佳。
A hyperdispersant poly （styrene-b -acrylic acid,PS-b -PAA）was synthesized by reversible addion-fragmentation chain transfer（RAFT） living free-radical polymerization, using styrene （St） and acrylic acid （AA） as monomer, benzyl dithiobenzoate as chain transfer agent, 2,2 ＇-azobis （2-cyanopropane,AIBN） as initiator. The research results showed that the copolymer with the molecular weight distribution as narrow as 1.1 -1.3 was obtlained, the conversion of polymerization can reach 95% at 80℃ within 24h. This work, therefore, displays hyperdispersant PS-b -PAA has well dispersion effectiveness on CaCO3 suspensions in water.
出处
《非金属矿》
CAS
CSCD
北大核心
2006年第6期5-7,共3页
Non-Metallic Mines
