Ultratough Yet Dynamic Crystalline Poly(thiourethane)Network Directly from Low Viscosity Precursors  

作　　者：Haijun Feng Yi Sheng Guancong Chen Binjie Jin Zizheng Fang Bo Yang Xiaorui Zhou Wenxuan Wu Tao Xie Ning Zheng 

机构地区：[1]State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058 [2]Department of Colorectal Surgery and Oncology,Key Laboratory of Cancer Prevention and Intervention,Ministry of Education,The Second Affiliated Hospital,Zhejiang University School of Medicine,Hangzhou 310027

出　　处：《CCS Chemistry》2024年第3期682-692,共11页中国化学会会刊（英文）

基　　金：supported by the National Natural Science Foundation of China(grant nos.52322307,52033009,22275162,and 52003232).

摘　　要：Thermosets based on direct curing of multifunctional monomers offer processing flexibility that thermoplastics cannot provide.However,this type of thermoset is typically amorphous since it is difficult to meet the stringent requirement of long-range molecular regularity for crystallization.However,we report here a crystallizable poly(thiourethane)thermoset synthesized directly from the curing of low-viscosity liquid precursors that does not employ any solvent.Its crystalline nature results in superior toughness,comparable to commercial high-density polyethylene,in sharp contrast to the brittleness of the typical,rigid,glassy thermoset materials.Beyond that,the network polymer exhibits shape-memory behavior in which the crystalline transition is utilized for temporary shape fixing/recovery whereas the dynamic thiourethane bonds can be activated for bond exchange as a mechanism for complex shape manipulation.Materials with these combined features represent attractive options for demanding engineering applications due to their high performance and multifunctinality.

关 键 词：THERMOSETS CRYSTALLINE POLYMER thiourethane thermadapt 

分 类 号：O6[理学—化学]