摘要
以聚N,N-二甲基丙烯酰胺(PDMA)为大分子链转移剂、苯乙烯(St)为单体,采用可逆加成-断裂链转移(RAFT)分散聚合制备了PDMA-b-PS-b-PDMA两亲性三嵌段共聚物胶束。考察了固含量和疏、亲溶剂链段比对胶束尺寸、形貌的影响。固含量为25%和30%时,胶束形貌转化过程是从球状、蠕虫状向囊泡状胶束发展,最终得到大小2种尺寸的嵌段共聚物形貌囊泡。固含量为30%,疏、亲溶剂链段比为300∶32和400∶32时,分别获得平均粒径约为900/310 nm和400/210 nm的大小囊泡;固含量为25%,疏、亲溶剂链段比为400∶32时,大小囊泡的尺寸分别约为520 nm和200 nm。固含量为35%和40%时,胶束形貌则由球状逐渐向海绵状、复合囊泡,大复合胶束转变,最终得到微米级大复合胶束。
PDMA-b-PS-b-PDMA amphiphilic triblock copolymers were synthesized via reversible-addition fragmentation chain transfer(RAFT)disperse polymerization with poly(N,N-dimethylacrylamide)(PDMA)as macro-CTA and styrene(St)as monomer in ethanol/water mixed solvent.The parameters affecting the morphology and size of the nano-objects,including solid contents and the ratio of hydrophobic and hydrophilic chain segments,were investigated.When the solid contents are 25%and 30%,the morphologies of copolymer micelles undergo a transition from spheres,worms to vesicles,and vesicles with two different sizes are obtained.When the solid content is 30%and the ratios of hydrophobic and hydrophilic chain segments are 300∶32 and 400∶32,vesicles with average particle sizes of about 900/310 nm and 400/210 nm are attained,respectively.When the ratio of hydrophobic and hydrophilic chain segments is 400∶32,the sizes of the large and small vesicles at 25%solid content are approximately 520 nm and 200 nm,respectively.When the solid contents are 35%and 40%,the morphologies of the micelles evolve from spheres to sponges,large composite vesicles and large composite micelles,and the final micelles are large composite micelles with size of micrometer.
作者
刘佳丽
燕春福
惠嘉
杨海宾
苏志鹏
曹艳玲
石艳
Jiali Liu;Chunfu Yan;Jia Hui;Haibin Yang;Zhipeng Su;Yanling Cao;Yan Shi(Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials,Beijing University of Chemical Technology,Beijing 100029,China;Hebei ShuangchengConstruction Engineering Testing Co.Ltd,Shijiazhuang 051130,China;Science Research Institute of Ministry of Trans port,Beijing 100029,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2021年第4期7-12,共6页
Polymer Materials Science & Engineering
基金
石家庄市科学技术研究与发展计划(201160144A)。
关键词
聚合诱导自组装
嵌段共聚物
分散聚合
polymerization-induced self-assembly
block copolymer
dispersion polymerization