Enhancement of Polypropylene Recycling Based on Diels-Alder Reaction

被引：0
|
作者：
Liu W. [1 ]
Niu H. [1 ]
机构：
[1] Department of Polymer Science and Engineering, School of Chemical Engineering Dalian University of Technology, Dalian
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2023年 / 39卷 / 12期
关键词：
Diels-Alder reaction; polypropylene; reactive processing; recycling;
D O I：
10.16865/j.cnki.1000-7555.2023.0231
中图分类号：
学科分类号：
摘要：
Diels- Alder (D- A) dynamic covalent bonds were grafted into commercial isotactic polypropylene by reactive processing method, and polypropylene with thermoreversible cross-linking structure was prepared by a one-step method in screw extruder. The effects of grafted monomer concentration and maleimide to furan group mole ratio on the mechanical properties of cross-linked polypropylene were studied in detail. In particular, the material properties during recycling were investigated. The results show that reversible cross- linking can significantly improve the flexural modulus and flexural strength of polypropylene, and the impact strength is also improved. When the furyl groups grafted on the side group of polypropylene is super-stoichiometric moderately to the cross-linking agent bismaleimide (i.e., the mole ratio of maleimide to furan group is 0.50), the highest properties are achieved. The reversible cross- linked polypropylene after two cycles of processing exhibits better mechanical properties than these of uncross- linked polypropylene. In addition, due to the thermal reversibility of D-A reaction, the cross-linked polypropylene presents the similar processing capability as commercial polypropylene. The introduction of dynamic covalent bond provides a new strategy for the enhancement of polypropylene recycling. © 2023 Chengdu University of Science and Technology. All rights reserved.
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页码：8 / 15
页数：7
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