摘要
以聚(丙烯腈-甲基丙烯酸甲酯-丙烯酸丁酯)为壳,对甲苯磺酰肼(TSH)为核,通过悬浮聚合法制得热胀性微胶囊。探讨了乳化剂和单体组成对微胶囊粒径、热膨胀性能的影响,并对其结构与性能进行了表征。红外谱图证实了AN-MMA-BA共聚物对TSH的成功包覆。微胶囊的横切扫描电镜图片显现出规整的核-壳结构。壳层共聚单体组成AN/MMA/BA为70%/20%/10%时所合成的微胶囊具有良好的热胀性能,含2%热胀性微胶囊的水性木器涂层经热处理后明显膨胀;热失重分析表明,较之于未加微胶囊的涂层,加入2%热胀性微胶囊涂层胶膜的失重起始温度提高了20℃以上,涂层热稳定性能提高,热分解温度范围为210～380℃,在250～320℃之间缓慢分解。
Thermal expandable microcapsules were prepared by suspension polymerization method with toluene-p-sulfonyl hydrazide as core material and poly （AN-MMA-BA） as shell material.The effect of surfactant on size distribution and that of monomers composition on thermal expansion of the microcapsules obtained were discussed.The chemical structure,morphologies and property of microcapsules were characterized.FTIR spectra identified successful capsulation of toluene-p-sulfonyl hydrazide（TSH） in poly（AN-MMA-BA） shell material.Well defined core-shell structure was clearly shown in the SEM image of the cross-section of microcapsule.Desirable thermal expansion property can be obtained with a shell monomers composition of 70%AN/20%MMA/10%BA.Waterborne wood coatings containing 2% of thermal expandable microcapsules exhibited an obvious thermal expansion after heat treatment.TG analysis suggested that thermal degradation of APU coating film containing microcapsules started at 210℃,which was 20℃ higher than that of APU coating film without microcapsules,and terminated at 380℃,revealing a slow thermal degradation between 250 and 320℃.It was indicated from TGA determination that thermal decomposition rate of the coatings film became slow,presenting thermal stability.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第7期1201-1204,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50903031)
中央高校基本科研业务专项资金资助项目(2009ZM0046)
关键词
微胶囊
水性木器涂料
阻燃涂料
热膨胀
microcapsules
waterborne wood coatings
flame-retardant coatings
thermal expansion
