In Situ and Online Monitoring Polymerization-Induced Micellization

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• 作者：Wenxi Ji ; Jingjing Yan ; Erqiang Chen ; Zichen Li ; Dehai Liang
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：July 8, 2008
• 年：2008
• 卷：41
• 期：13
• 页码：4914 - 4919
• 全文大小：292K
• 年卷期：v.41,no.13(July 8, 2008)
• ISSN：1520-5835

文摘

The polymerization-induced micellization of poly(ethylene oxide)-b-poly(styrene-alt-maleic anhydride) (PEO-b-P(S-alt-MAn)) in CHCl₃ was monitored in situ by laser light scattering. Reversible addition−fragmentation chain transfer (RAFT) polymerization was used to grow the P(S-alt-MAn) block onto the PEO macromolecular chain transfer agents (macro-CTAs) at 55 °C. The whole process underwent three stages over time: the induction period, the formation of loose aggregates, and the formation of micelles. The polymerization process and the micellization process were affected mutually: the increase in the degree of polymerization induced the micellization of PEO-b-P(S-alt-MAn); meanwhile, the formation of core−shell micelles retarded the polymerization rate. At higher polymer concentrations, the mutual effect was even stronger, where smaller size micelles with higher density were obtained.