UPy封端超分子可剥离热熔胶的本体合成及性能研究  

Bulk synthesis and properties of UPy-terminated supramolecular peelable hot melt adhesive

作　　者：饶厚东 张玲 程伟 王雯霏 袁煜 魏柳荷[2] 李禹函 Rao Houdong;Zhang Ling;Cheng Wei;Wang Wenfei;Yuan Yu;Wei Liuhe;Li Yuhan(CSSC Luoyang Ship Material Research Institute,Luoyang 471027,Henan,China;College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,河南洛阳471027 [2]郑州大学化学学院,河南郑州450001

出　　处：《中国胶粘剂》2023年第10期1-9,47,共10页China Adhesives

基　　金：基础加强计划技术领域基金项目(2019⁃JCJQ⁃JJ⁃532)。

摘　　要：可重复使用及回收的胶粘剂是电子工业领域发展的必然趋势。本研究采用本体聚合法,以聚酯多元醇(7130)、聚乙二醇(PEG-1500)和异佛尔酮二异氰酸酯(IPDI)为原料合成聚氨酯预聚体。再以2-氨基−4-羟基−6-甲基嘧啶(UPy)封端,在直链型聚氨酯的末端接入UPy序列形成自互补四重氢键,合成了具备优良力学性能、粘接性能、抗冲击、可重复使用的超分子聚氨酯热熔胶(HMA-UPy),并对其结构和各项性能进行了测定或表征。研究结果表明:(1)成功合成了HMA-UPy,并且该热熔胶比常规的聚氨酯热熔胶法得到的分子量小;(2)在聚合物末端中引入UPy交联剂,对软链段的玻璃化转变温度(Tg)没有明显的影响,UPy序列提供了高热力学稳定性和快速的动力学可逆性,并且聚合物链末端的UPy序列不会破坏基于PEG-7130的软链段嵌段结构,从而使HMA-UPy柔软、可拉伸但又坚韧;(3)该热熔胶易于加工,可重复使用,机械强度良好,中等的黏流转变温度(135℃)和氢键的快速动态可逆性非常适合多次剥离和重复粘接;(4)该热熔胶具有两个失重峰值,分别为338.03和428.34℃,远高于常规热熔胶的热熔温度,完全满足使用需求;(5)这一合成策略有望为设计抗冲击和可重复使用的热熔结构胶开辟一条新的途径,对于开发高强度、可剥离、可重复使用、抗冲击的热可逆胶粘剂提出了一种新的策略,为其在工业生产领域的应用提供了一种有效方案。Reusable and recyclable adhesives are an inevitable trend in the development of the electronic industry.In this study,polyurethane prepolymer was synthesized by using polyester polyols(7130),polyethylene glycol(PEG-1500)and isophorone diisocyanate(IPDI)as raw materials through bulk polymerization.Then it was terminated with 2-amino-4-hydroxy-6-methylpyrimidine(UPy)and inserted into the UPy sequence at the end of the linear polyurethane to form self-complementary quadruple hydrogen bonds,the supramolecular polyurethane hot melt adhesive(HMA-UPy)with excellent mechanical properties,bonding properties,impact resistance,and reusability was synthesized,and its structure and various properties were measured or characterized.The research results showed that,(1)HMA-UPy was successfully synthesized,and the molecular weight of this hot melt adhesive was smaller than that obtained by conventional polyurethane hotmelt adhesive method.(2)Introducing UPy crosslinking agent into the polymer end had no significant effect on the glass transition temperature(Tg)of the soft chain segment.The UPy sequence provided high thermal mechanical stability and fast kinetic reversibility,and the UPy sequence at the polymer chain end did not damage the block structure of soft chain segment based on PEG-7130,making HMA-UPy soft,stretchable,but tough(.3)This hot melt adhesive was easy to process,reusable,with good mechanical strength,moderate viscous flow transition temperature(135℃),and fast dynamic reversibility of hydrogen bonds,making it very suitable for multiple peeling and repeated bonding.(4)This hot melt adhesive had two weight loss peaks,namely 338.03 and 428.34℃,which were much higher than the hot melting temperature of conventional hot melt adhesive and fully met the usage requirements.(5)This synthesis strategy was expected to open up a new path for designing impact resistance and reusable hot melt structural adhesive.It proposed a new strategy for developing high-strength,peelable,reusable,and impact resistance thermally revers

关 键 词：热熔胶 抗冲击 可重复 高强度 自互补四重氢键 

分 类 号：TQ436[化学工程]