Synthesis of double-shell microcapsule containing MOF as the curing agent of epoxy resin

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Mingyang Zhao, Xiao-Min Li, Junkuo Gao
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Abstract

Microcapsule-type curing agents that have a single polymer shell encounter challenges due to the inadequate airtightness of the shell material, which affects the storage stability of the epoxy resin (EP) once it has been mixed. In this work, a microcapsule-type latent curing agent with an extended storage period was successfully prepared by introducing a metal-organic framework (MOF) as its second-layer shell. Imidazole (Im), as a curing agent, was initially encapsulated in polyurethane (PU) via the interfacial polymerization to form the single-shell microcapsule (Im@PU), in which different morphologies and core contents (IPM1-7) were obtained by adjusting the mass ratio of the core to shell. The optimal formulation, designated as IPM2, was determined due to its smooth surface and uniform size distribution. Subsequently, ZIF-8 was co-coordinated and grown on the surface of IPM2 to form a double-shell microcapsule-type curing agent (Im@PU@ZIF-8). The Im@PU@ZIF-8 exhibits delayed kinetic behaviors and enhanced storage stability. Notably, the Im@PU@ZIF-8 can be reliably stored for over 35 days at 40 °C. Meanwhile, the shell material ZIF-8 can be employed as a functional filler to enhance the mechanical properties of epoxy composites. This feasible strategy develops innovative ideas for the EP-latent curing agent systems and aims to establish a general method.

Abstract Image

Abstract Image

以MOF为固化剂的环氧树脂双壳微胶囊的合成
具有单一聚合物外壳的微胶囊型固化剂由于外壳材料的气密性不足而面临挑战,这影响了环氧树脂(EP)混合后的储存稳定性。本研究通过引入金属有机骨架(MOF)作为其第二层外壳,成功制备了一种具有延长贮存期的微胶囊型潜固化剂。咪唑(Im)作为固化剂,首先通过界面聚合封装在聚氨酯(PU)中,形成单壳微胶囊(Im@PU),通过调整核壳质量比获得不同的形貌和核含量(IPM1-7)。由于其表面光滑,粒径分布均匀,确定了最佳配方IPM2。随后,ZIF-8协同生长在IPM2表面,形成双壳微胶囊型固化剂(Im@PU@ZIF-8)。Im@PU@ZIF-8表现出延迟的动力学行为和增强的储存稳定性。值得注意的是,Im@PU@ZIF-8可以在40°C下可靠地储存超过35天。同时,壳层材料ZIF-8可以作为功能性填料,提高环氧复合材料的力学性能。这种可行的策略为ep潜固化剂体系提供了创新思路,旨在建立一种通用的方法。
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
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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