• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Monodisperse highly cross-linked 'living' microspheres prepared via photoinitiated RAFT dispersion polymerization
【24h】

Monodisperse highly cross-linked 'living' microspheres prepared via photoinitiated RAFT dispersion polymerization

机译：通过光引发的RAFT分散聚合制备的单分散高交联“活性”微球

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cross-linked PMMA microspheres have been synthesized by photoinitiated RAFT dispersion polymerization with dipropylene glycol diacrylate (DPGDA) or trimethylolpropane triacrylate (TMPTA) as the cross-linker. Monodisperse microspheres were obtained in the presence of 0.5 wt% S, S'-bis(alpha,alpha'-dimethyl-alpha ''-acetic acid) trithiocarbonate (BDMAT, a RAFT agent) with DPGDA concentration up to 5 wt% or TMPTA concentration up to 2 wt%. The particle formation process was investigated, and the results reveal that the cross-linking reaction was retarded to a certain extent by the RAFT process, which is crucial for the formation of uniform particles under high cross-linker concentrations. The phase diagrams for the methodology have been built up, and show that the procedure could only give polydisperse microspheres at a low DPGDA concentration or coagulum at a high DPGDA concentration in the absence of a RAFT agent, and monodisperse microspheres were obtained at DPGDA concentration up to 5 wt% when the RAFT agent concentration reached an appropriately high level, e.g. 0.5 wt% BDMAT or 0.75 wt% DDMAT. By adjusting the reaction conditions, we have prepared monodisperse cross-linked PMMA microspheres with 10 wt% DPGDA added at the beginning of the reaction. Furthermore, we have functionalized the cross-linked microspheres by adding a functional comonomer to the system at the beginning of polymerization, or by surface-initiated RAFT polymerization via the RAFT groups attached on the particle surface.
机译：交联的PMMA微球是通过以二丙二醇二丙烯酸酯（DPGDA）或三羟甲基丙烷三丙烯酸酯（TMPTA）作为交联剂的光引发RAFT分散聚合合成的。单分散微球是在DPGDA浓度最高为5 wt％或TMPTA的S，S'-双（α，α'-二甲基-α''-乙酸）三硫代碳酸酯（BDMAT，RAFT试剂）存在下获得的浓度最高可达2 wt％。对颗粒形成过程进行了研究，结果表明，RAFT过程在一定程度上阻碍了交联反应的进行，这对于在高交联剂浓度下形成均匀的颗粒至关重要。已经建立了该方法的相图，表明该方法只能在没有RAFT试剂的情况下得到低DPGDA浓度的多分散微球或高DPGDA浓度的凝结物，并且在DPGDA浓度高时获得单分散微球。当RAFT剂浓度达到适当高水平时，例如达到5 wt％ 0.5 wt％BDMAT或0.75 wt％DDMAT。通过调节反应条件，我们制备了在反应开始时添加了10 wt％DPGDA的单分散交联PMMA微球。此外，我们通过在聚合反应开始时向系统中添加功能性共聚单体，或通过附着在颗粒表面的RAFT基团通过表面引发的RAFT聚合，对交联的微球进行了功能化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号