报告题目：Tough polymer gels reinforced by strain-induced crystallization

报 告 人：The University of Tokyo, Koichi Mayumi 教授

报告时间：2025年5月19日（星期一）上午9:00

报告地点：莫干山校区图书馆B510会议室

邀 请 人：高分子材料与工程研究所 郑司雨 副研究员

报告人简介：

Prof. Koichi Mayumi received his PhD degree (2011) from the University of Tokyo (Director: Prof. Kohzo Ito) and did Postdoc at ESPCI ParisTech (Director: Prof. C. Creton and T. Narita). After that, he worked at the University of Tokyo as assistant professor (2014-2018), senior lecture (2018-2020) and associate professor (2020-now). Currently, he is the principle investigator (PI) of his research group at the institute for solid state physics, the University of Tokyo. His research interests include: 1) toughening mechanism of tough polymeric materials, 2) structure of multi-component polymer and soft matter systems by small-angle neutron/X-ray scattering and 3) dynamics of multi-component polymer and soft matter systems by quasi-elastic neutron scattering. Up to now, he has published 70+ papers in high quality journals like Science, J. Am. Chem. Soc., Sci. Adv., Nat. Commun. and so on.

报告内容摘要：

Recently, we have successfully developed tough polymer gels utilizing strain-induced crystallization (SIC) [1-6]. In order to realize SIC in polymer gels, the polymer chain orientation under stretching should be homogeneous. We have discovered that SIC occurs in polymer gels with homogeneous polymer networks and sufficiently high polymer concentrations: slide-ring (SR) hydro gels [1], SR ion gels [2,3], tri-branched PEG gels [4], and tetra-branched PEG gels [5]. From in-situ wide-angle X-ray scattering (WAXS) experiments on the gels under repeated tensile deformation, we found that crystalline of PEG in the gels forms at a large strain and destructs quickly when applied stress is reduced. The reversible strain-induced crystallization yields the high toughness and elasticity.

[1] Science 2021, 372, 1078.

[2] Sci. Adv. 2023, 9, eadi8505.

[3] Macromolecules 2024, 57, 11498.

[4] Sci. Adv. 2022, 8, eabk0010.

[5] Macromolecules 2024, 57, 1461.

[6] Polym. J. 2024, 57, 449.