Preparation and characterization of poly(urea-formaldehyde) microcapsules filled with epoxy resins
Preparation and characterization of poly(urea-formaldehyde) microcapsules filled with epoxy resins
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DOI：
10.1016/j.polymer.2006.05.051
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发表时间：
2006-07-12
期刊：
影响因子：
4.6
通讯作者：
Guo, Jing
中科院分区：
文献类型：
--
作者：
Yuan, Li;Liang, Guozheng;Guo, Jing
微胶囊的制备在自修复复合材料的制备中的应用越来越受到人们的关注。采用原位聚合技术，以聚脲醛树脂（PLJF）为壳层材料，环氧树脂（双酚A二缩水甘油醚：DGEBPA）和1-丁基缩水甘油醚（BGE）的混合物为芯层材料，制备了一系列新型微胶囊。采用光学显微镜对芯材微胶囊化过程进行了监测。采用傅里叶变换红外光谱（FTIR）对微胶囊的化学结构进行了表征。用金相显微镜（MS）、扫描电镜（SEM）和光学显微镜（OM）分别观察了微胶囊的形貌和壳壁厚度。研究了不同预聚物、尿素与甲醛的质量比、搅拌速率对微胶囊物理性能的影响。分析了微胶囊在不同时间和温度下的贮存稳定性。采用差示扫描量热法（DSC）和热重分析（TGA）研究了微胶囊的热性能。结果表明，该方法可以成功地制备出含环氧树脂的聚氨酯微胶囊，且在微胶囊化过程中，环氧树脂中的环氧环几乎不受周围介质的影响。微胶囊的粗糙外表面由聚结的PLJF纳米颗粒组成。通过选择不同的工艺参数可以控制微胶囊的尺寸和表面形貌。该微胶囊在室温下基本上表现出良好的储存稳定性，并且在加热温度高达约238 ℃之前它们是化学稳定的。(c)2006爱思唯尔有限公司保留所有权利。
The preparation of microcapsules applied to the fabrication of self-healing composites has been paid more attentions. A new series of microcapsules were prepared by in situ polymerization technology with poly(urea-formaldehyde) (PLJF) as a shell material and a mixture of epoxy resins (diglycidyl ether of bisphenol A: DGEBPA) and 1-butyl glycidyl ether (BGE) as core materials. The microencapsulating process of core material was monitored using optical microscopy (OM). The chemical structure of microcapsule was characterized using Fourier-transform infrared spectroscopy (FTIR). Morphology and shell wall thickness of microcapsule were observed using metalloscope (MS), scanning electron microscopy (SEM) And OM, respectively. The effects of different pre-polymers, weight ratios of urea to formaldehyde (U-F) and the agitation rates on the physical properties of microcapsules were investigated. The storage stability of microcapsules at different times and temperatures was analyzed. The thermal properties of microcapsules were investigated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicate that PUF microcapsules containing epoxy resins can be synthesized successfully, and during the microencapsulation, the epoxide rings in epoxy resins are hardly affected by the surrounding media. The rough outer surface of microcapsule is composed of agglomerated PLJF nanoparticles. The size and surface morphology of microcapsule can be controlled by selecting different processing parameters. The microcapsules basically exhibit good storage stability at room temperature, and they are chemically stable before the heating temperature is up to approximately 238 degrees C. (c) 2006 Elsevier Ltd. All rights reserved.