Heterogeneous Epoxidation of Microcrystalline Cellulose and the Toughening Effect toward Epoxy Resin,Industrial & Engineering Chemistry Research

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Heterogeneous Epoxidation of Microcrystalline Cellulose and the Toughening Effect toward Epoxy Resin
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-02-01 , DOI: 10.1021/acs.iecr.2c03919
Chang Su ₁ , Jianfang Guo ₁ , Jue Cheng ₁ , Junying Zhang ₁ , Feng Gao ₁

Affiliation

Microcrystalline cellulose (MCC) is regarded as a potential filler in the fabrication of epoxy composites. However, MCC’s hydrophilic nature and strong hydrogen bonds caused by abundant surface hydroxyl groups greatly weaken its compatibility with the epoxy resin. In addition, it remains a challenge to efficiently and heterogeneously modify MCC surface hydroxyl groups. In this work, MCC was epoxidized heterogeneously with a phase-transfer catalyst. Results indicated that 4.48% (by mass) or 58.15% (by coverage) of the hydroxyl groups on MCC was modified. The dispersibility of epoxidized MCC (EP-MCC) in the epoxy resin was significantly improved. At the same time, EP-MCC showed the ability to interact with the epoxy network covalently, improving the interface interactions, indicating the simultaneous enhancement of the modulus and the toughness. As a result, this heterogenous epoxidation method showed high efficiency in reducing the surface hydroxyl content of MCC, endowing it with a bright future in industrial applications of epoxy composites.

中文翻译：

微晶纤维素的多相环氧化及其对环氧树脂的增韧作用

微晶纤维素 (MCC) 被认为是制造环氧复合材料的潜在填料。然而，MCC的亲水性和丰富的表面羟基导致的强氢键大大削弱了它与环氧树脂的相容性。此外，有效和多相地修饰MCC表面羟基仍然是一个挑战。在这项工作中，MCC 用相转移催化剂进行了非均相环氧化。结果表明，MCC 上 4.48%（按质量计）或 58.15%（按覆盖率计）的羟基被修饰。环氧化MCC（EP-MCC）在环氧树脂中的分散性得到显着改善。同时，EP-MCC表现出与环氧树脂网络共价相互作用的能力，改善了界面相互作用，表明模量和韧性同步增强。

更新日期：2023-02-01

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