首页|Injection molding of highly filled microcrystalline cellulose/polycaprolactone composites with the aid of reversible Diels-Alder reaction

Injection molding of highly filled microcrystalline cellulose/polycaprolactone composites with the aid of reversible Diels-Alder reaction

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To tackle the challenge of producing highly filled polymer composites using the traditional injection molding technique,which is characterized by the fairly high melt viscosity that makes mold filling diffi-cult,the authors propose a solution based on dynamic covalent chemistry.As demonstrated by the proof-of-concept experiments,the 4-arm star-shaped polycaprolactone(PCL)oligomers and microcrystalline cel-lulose(MCC)are crosslinked by the reversible Diels-Alder(DA)bonds.The flowability of the compounds greatly decreases due to the dissociation of the intercomponent DA bonds at the retro-reaction tempera-ture,and the networked architecture is reconstructed during cooling as a result of the forward DA reac-tion.Consequently,the high-loading MCC fillers are well distributed in the matrix and covalently bonded to the nearby PCL,forming a striking contrast to the control in which linear PCL acts as the matrix.The DA bonds crosslinked biodegradable PCL composites exhibit decent mechanical strength(20.7 MPa)even at the MCC fraction of 65 wt％,which is superior to those(5-12.2 MPa)of the highly filled PCL composites(with filler contents of 50-63.8 wt％)reported so far.The proposed approach has sufficient expansibility for the fabrication of the highly filled polymer composites constructed by other types of matrix and fillers.

Polymer compositesMicrocrystalline cellulosePolycaprolactoneInjection moldingDynamic reversible chemistry

Ze Pu Wang、Wen Hong Ruan、Min Zhi Rong、Ming Qiu Zhang

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Key Laboratory for Polymeric Composite and Functional Materials of MOE,GD HPPC Lab,IGCME,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,China

国家自然科学基金国家自然科学基金国家自然科学基金广东省自然科学基金广东省自然科学基金广东省自然科学基金Science and Technology Planning Project of Guangzhou CityFundamental Research Funds for the Central Universities,Sun Yatsen University

5203301151973237521730922019B15151200382020A15150112762021A151501041720220101156823yxqntd002

2024

10.1016/j.jmst.2023.07.017

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.170(3)
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