Amidation of Carboxylated Cellulose Nanocrystals by Silane Coupling Agents with Amino Groups for Crosslinking and Reinforcement of Polydimethylsiloxane

Yuan Li; Xiao-yu Hou; Ke Liu; Xin Huang; Jian-ming Zhang; Yong-xin Duan

doi:10.11777/j.issn1000-3304.2025.25051

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Amidation of Carboxylated Cellulose Nanocrystals by Silane Coupling Agents with Amino Groups for Crosslinking and Reinforcement of Polydimethylsiloxane

更新时间：2025-06-26

- Amidation of Carboxylated Cellulose Nanocrystals by Silane Coupling Agents with Amino Groups for Crosslinking and Reinforcement of Polydimethylsiloxane
- Acta Polymerica Sinica Pages: 1-13(2025)
- 作者机构：
  
  青岛科技大学高分子科学与工程学院青岛 266042
- 作者简介：
  
  Yong-xin Duan, E-mail: dyx@qust.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25051
  CLC：
- CSTR：32057.14.GFZXB.2025.7418
- Received：26 February 2025，
  
  Accepted：17 May 2025，
  
  Published Online：26 June 2025，
- 稿件说明：
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李媛, 侯晓宇, 刘克, 黄鑫, 张建明, 段咏欣. 氨基硅烷偶联剂酰胺化改性纤维素纳米晶交联和补强聚二甲基硅氧烷的研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25051

Li, Y.; Hou, X. Y.; Liu, K.; Huang, X.; Zhang, J. M.; Duan, Y. X. Amidation of carboxylated cellulose nanocrystals by silane coupling agents with amino groups for crosslinking and reinforcement of polydimethylsiloxane. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25051
李媛, 侯晓宇, 刘克, 黄鑫, 张建明, 段咏欣. 氨基硅烷偶联剂酰胺化改性纤维素纳米晶交联和补强聚二甲基硅氧烷的研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25051 DOI： CSTR： 32057.14.GFZXB.2025.7418.

Li, Y.; Hou, X. Y.; Liu, K.; Huang, X.; Zhang, J. M.; Duan, Y. X. Amidation of carboxylated cellulose nanocrystals by silane coupling agents with amino groups for crosslinking and reinforcement of polydimethylsiloxane. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25051 DOI： CSTR： 32057.14.GFZXB.2025.7418.

摘要

将来源于自然界的纤维素纳米晶(CNCs)用于补强聚二甲基硅氧烷(PDMS)，在提高其强度的同时，还能赋予复合材料一定的生物友好特性，契合可持续发展的趋势. 然而，CNCs与PDMS的相容性差，难以在基体中均匀分散，对CNCs进行硅烷化接枝改性，是提高其与PDMS间相容性的有效途径. 为避免硅烷偶联剂在接枝过程中的自聚合，本研究利用羧基化纤维素纳米晶(CCA)的羧基与3-氨丙基三乙氧基硅烷(KH550)所带氨基的酰胺化反应，制备了高硅烷氧基含量的纤维素纳米晶(CCK). CCK所带硅烷氧基可参与PDMS的交联反应，从而在两者之间形成共价相互作用，促进了CCK在PDMS中的均匀分散，使得CCK兼具补强和交联的双重作用，大幅提高了PDMS/CCK复合材料的力学性能. 此外，相比PDMS，PDMS/CCK具有更高的热稳定性.

Abstract

Cellulose nanocrystals (CNCs) derived from natural sources were incorporated to reinforce polydimethylsiloxane (PDMS)

which not only enhanced the mechanical strength but also imparted a degree of biocompatibility to the composite

aligning with the principles of sustainable development. However

the poor compatibility between CNCs and PDMS makes it difficult for CNCs to disperse uniformly within the matrix. Silanization grafting modification of CNCs is an effective way to improve their compatibility with PDMS. To prevent the self-polymerization of silane coupling agents during the grafting process

this study utilized the carboxyl groups on carboxylated cellulose nanocrystals (CCA) to react with the amino groups of 3-aminopropyltriethoxysilane (KH550) via amidation

thereby producing cellulose nanocrystals with high silane groups (CCK). The silane groups on CCK can participate in the crosslinking reaction with PDMS

forming covalent interactions between the two

which promotes the uniform dispersion of CCK in the PDMS matrix. CCK exhibits dual functions of reinforcement and crosslinking

significantly improving the mechanical properties of PDMS/CCK composites. Furthermore

compared to pure PDMS

the PDMS/CCK composites demonstrate enhanced thermal stability.

关键词

Keywords

references

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Beijing National Research Center for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics Education Ministry, Center for Soft Matter Science and Engineering of Peking University, Institute of Chemistry and Molecular Science, Peking University

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