摘要
Janus颗粒是一类具有化学不对称中心的材料,拥有明确的空间分区及各向异性,因其独特的双亲性及双重功能性,近年来成为材料领域的研究热点.本文采用种子乳液聚合及相分离相结合的方法,制得了组成及结构精确可控的有机/无机杂化二氧化硅@聚二乙烯基苯/聚苯乙烯(SiO_(2)@PDVB/PS)Janus颗粒.通过改变原料投料比实现对雪人状SiO_(2)@PDVB/PS Janus颗粒形貌的精确调控;通过对反应演化过程的实时跟踪分析,明确了Janus颗粒的形成机理:在反应初始阶段,带双键的硅烷偶联剂3-(甲基丙烯酰氧)丙基三甲氧基硅烷(MPS)溶胀种子空心球壳体并通过聚合形成聚MPS(PMPS)而诱导发生相分离;之后,PMPS通过水解缩合,进一步促进相分离过程.通过调节交联空心球种子体系的pH,调控了硅烷偶联剂MPS的溶胶-凝胶过程,制备了多种拓扑结构的有机/无机杂化Janus颗粒.
Janus particles with chemical asymmetric center,definite spatial partition and anisotropy,unique amphiphilic and dual functional properties,have attracted much attention.Herein,a variety of organic/inorganic hybrid SiO_(2)@PDVB/PS Janus particles with varied compositions and structures were prepared by a combination of seed emulsion polymerization and phase separation.Snowman-like SiO_(2)@PDVB/PS Janus particles were obtained and the structure and morphology were regulated by changing the feeding ratio of raw materials.The formation mechanism of the Janus particles was clarified via the real-time tracking analysis of the reaction evolution process:in the initial reaction stage,the shell of the seed hollow sphere was swelled by the silane coupling agent 3-methacryloxypropyltrimethoxysilane(MPS)that further polymerized to form polymer MPS(PMPS),which induced the process of phase separation.Then,the hydrolytic condensation of PMPS further promoted the phase separation process.In addition,the Janus particles with various topological morphologies were effectively prepared by adjusting the pH value in the sol-gel process of MPS.
作者
魏书斐
金恒仟
张新萍
贺爱华
Shufei Wei;Hengqian Jin;Xinping Zhang;Aihua He(Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization,Key Laboratory of Rubber-Plastics of Ministry of Education,School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《中国科学：化学》
CAS
CSCD
北大核心
2022年第4期618-624,共7页
SCIENTIA SINICA Chimica
基金
山东省泰山学者工程
国家自然科学基金(编号:52103085)资助项目。
关键词
纳米颗粒
结构调控
有机/无机杂化
乳液聚合
nanoparticles
structural regulation
organic/inorganic hybrid
emulsion polymerization
