Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (7): 20240546.doi: 10.7503/cjcu20240546

• Polymer Chemistry • Previous Articles     Next Articles

Preparation of Hyperbranched Poly(ethylene glycol)s via Reversible Addition-fragmentation Chain Transfer Free Radical Polymerization of Multivinyl Monomers and Their Application in Stem Cell Culture

LI Zhili, ZHOU Dezhong()   

  1. School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China
  • Received:2024-12-18 Online:2025-07-10 Published:2025-04-14
  • Contact: ZHOU Dezhong E-mail:dezhong.zhou@xjtu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52473147)

Abstract:

Using poly(ethylene glycol) diacrylate(PEGDA) as the multivinyl monomers(MVMs), 4-cyano-4-(phenylcarbonothioylthio)pentanoic acid(CPADB) as the chain transfer agent, and 2,2'-azobisisobutyronitrile(AIBN) as the initiator, two hyperbranched poly(ethylene glycol)s(HBPs) with different branching degrees and multiple pendent vinyl groups were successfully prepared in a one-pot reversible addition-fragmentation chain transfer(RAFT) polymerization by regulating reaction parameters to specifically promote intermolecular combination. HBPs can react with thiolated gelatin(gel-SH) via thiol-ene click chemistry to form HBP/gel-SH hydrogels and be used for the culture of human induced mesenchymal stem cells(iMSCs). The chemical composition and structure of the HBPs were characterized using gel permeation chromatography(GPC) and nuclear magnetic resonance spectrometry. Research results indicated that the branching degrees of HBPs can be effectively regulated by adjusting PEGDA monomer reaction concentration and n(PEGDA)∶n(CPADB)∶n(AIBN). Rheological analysis showed that HBPs and gel-SH could cross-link to form a hydrogel within 2 min. Cell culture experiments demonstrated that the HBP/gel-SH hydrogels exhibited no significant cytotoxicity, and the hydrogel formed by the higher branching polymer displayed better biocompatibility. These hydrogels hold great potential for applications in stem cell culture and expansion.

Key words: Hyperbranched polymer, Hydrogel, Thiol-ene click chemistry, Cell culture

CLC Number: 

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