基于乙基纤维素大分子RAFT试剂的n-BMA细乳液聚合  

n-BMA miniemulsion polymerization based on ethyl cellulose macro-RAFT reagent

作　　者：程增会[1,2] 王基夫 王春鹏[1] 储富祥[1] 许凤[2] CHENG Zeng-hui;WANG Ji-fu;WANG Chun-peng;CHU Fu-xiang;XU Feng(Institute of Chemical Industry of Foresty Products,CAF,Nanjing 210042,China;College of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所生物质化学利用国家工程实验室国家林业局林产化学工程重点开放性实验室江苏省生物质能源与材料重点实验室,江苏南京210042 [2]北京林业大学材料科学与技术学院,北京100083

出　　处：《应用化工》2019年第7期1614-1618,共5页Applied Chemical Industry

基　　金：中央级公益性科研院所基本科研业务费专项(CAFYBB2017ZF003)

摘　　要：以大分子乙基纤维素基RAFT试剂(EC-CPADB)为链转移剂,采用可逆加成-断裂链转移聚合(RAFT)聚合法,合成了乙基纤维素接枝聚甲基丙烯酸丁酯(PBMA)细乳液。通过凝胶渗透色谱(GPC)、动态光散射激光粒度仪(DLS)、原子力显微镜(AFM)、差示扫描量热仪(DSC)、拉伸测试等进行表征。结果表明,纤维素大分子RAFT试剂EC-CPADB在细乳液聚合中发挥了一定的活性控制的作用,得到的聚合物分子量为141100,并且分子量分布窄,PDI为2.82,聚合物的玻璃化转变温度为21℃。大分子RAFT试剂EC-CPADB的加入,对聚合体系有一定的缓聚作用,但体系反应效率高,反应2h,转化率大于90%;大分子RAFT试剂EC-CPADB的存在,对乳液粒子的形貌没有明显影响,乳液粒径大小约为100nm,呈规则的圆球状,分布较均一。膜循环拉伸实验显示,聚合物弹性恢复系数能够达到90%以上,具有较好的弹性力学性能。Miniemulsion polymerization of n- butyl methacrylate ( n- BMA) was performed in the presence of EC-based macro-RAFT agent by reversible addition-fragmentation chain transfer (RAFT).The resulting product was characterized by gel permeation chromatography (GPC),dynamic light scattering(DLS),atomic force microscopy (AFM),differential scanning calorimetry (DSC) and tensile test.The results indicate that the micro-RAFT agent EC-CPADB played a certain living control role in the miniemulsion polymerization.The molecular weight of the polymer was 141 100 with the polydispersity index (PDI) of 2.82.The glass transition temperature of about 21 ℃.Furthermore,although an inhibition period was observed,the reaction exhibited a high efficiency with more than 90% conversion after 2 h reaction.The addition of EC-CPADB had no obvious influence on the morphology of the emulsion particles.The particle size was about 100 nm,and it had a regular spherical shape and a uniform distribution.The cyclic tensile tests showed that the polymer elastic recovery (ER) could reach 90%,demonstrating good elasticity properties.

关 键 词：细乳液 乙基纤维素 RAFT 活性可控 聚合物 

分 类 号：TQ316.3[化学工程—高聚物工业]