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通过悬浮聚合法合成出了含甲基丙烯酸的高温发泡微球。在传统单体丙烯腈和甲基丙烯酸甲酯的基础上,加入功能性单体甲基丙烯酸提高了微球的发泡性能。通过粒径分析、热机械分析以及热失重分析等一系列分析方法对微球发泡性能进行了对比分析,最终确定了影响微球发泡性能的主要因素。结果表明:当引发剂BPO用量为0.5份,发泡剂异辛烷和异戊烷用量均为20份,交联剂EGDMA用量为0.15份时,制备出的发泡微球的最大发泡温度Tm高达202.7℃,发泡后膨胀倍率高达110.8倍。同时,发泡微球仍拥有良好的储存稳定性。
The high temperature foaming microspheres containing methacrylic acid were synthesized by suspension polymerization. Based on the traditional monomer acrylonitrile and methyl methacrylate, the functional monomer methacrylic acid is added to improve the foaming properties of the microspheres. By means of a series of analytical methods such as particle size analysis, thermomechanical analysis and thermogravimetric analysis, the foaming properties of the microspheres were comparatively analyzed, and the main factors affecting the foaming properties of the microspheres were finally determined. The results showed that when the amount of initiator BPO was 0.5 part, the amount of isooctane and isopentane in foaming agent were both 20 parts and the amount of crosslinker EGDMA was 0.15 parts, the maximum foaming temperature Tm up to 202.7 ℃, expansion rate after foaming up to 110.8 times. At the same time, the foamed microspheres still have good storage stability.