Self-healing waterborne polyurethane nanocomposites with high strength and toughness based on ureidopyrimidinone-modified cellulose nanocrystals

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers Pub Date : 2025-05-23 DOI:10.1016/j.carbpol.2025.123806

Naishuo Yan , Xiuzhong Zhu , Li Tian , Jinbang Han , Jinjie Zang , Haitao Zhang

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引用次数: 0

Abstract

Cellulose nanocrystals (CNCs), as a biomass resource, are mainly used as fillers to enhance the mechanical strength of materials. However, CNCs are prone to aggregation in an aqueous matrix due to their high hydroxyl group content. Nevertheless, preparing high-performance synthetic polymers or biopolymers to reinforce polymer nanocomposites is still a significant challenge. Herein, a strategy was developed to prepare high-performance waterborne polyurethane (WPU) nanocomposites via synergistic interaction of multiple hydrogen-bonded assemblies and disulfide bonding. First, 2-ureido-4-[1H]-pyrimidinone (UPy) motifs were grafted onto CNC to obtain UPy-CNC and alleviate the aggregation problem. Then, WPU nanocomposites containing aromatic and aliphatic disulfide bonds were reinforced by UPy-CNC. The tensile strength and toughness of the composites were tested. The tensile strength of the material reached 48.07 ± 2.45 MPa, and the toughness was as high as 142.72 ± 2.7 MJ m⁻³. Thus, these nanocomposites exhibited exceptional tensile strength as well as good elongation at break and self-healing properties. This simple and effective strategy to prepare WPU nanocomposites may have excellent application value in waterborne coatings.

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基于脲嘧啶修饰纤维素纳米晶体的高强度、高韧性自修复水性聚氨酯纳米复合材料

纤维素纳米晶体（CNCs）作为一种生物质资源，主要用作填料来增强材料的机械强度。然而，由于cnc的高羟基含量，它容易在水性基质中聚集。然而，制备高性能的合成聚合物或生物聚合物来增强聚合物纳米复合材料仍然是一个重大挑战。本文提出了一种利用多个氢键组件和二硫键的协同作用制备高性能水性聚氨酯纳米复合材料的策略。首先，将2-脲基-4-[1H]-嘧啶酮（UPy）基序接枝到CNC上，得到UPy-CNC，缓解了聚集问题。然后，用UPy-CNC对含有芳香族和脂肪族二硫键的WPU纳米复合材料进行增强。测试了复合材料的拉伸强度和韧性。材料的抗拉强度达到48.07±2.45 MPa，韧性高达142.72±2.7 MJ m−3。因此，这些纳米复合材料表现出优异的抗拉强度以及良好的断裂伸长率和自愈性能。这种制备方法简单有效，在水性涂料中具有良好的应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Carbohydrate Polymers 化学-高分子科学

CiteScore

22.40

自引率

8.00%

发文量

1286

审稿时长

47 days

期刊介绍： Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.