摘要
研究了羧基碳纳米管(CNT-COOH)增强酚醛泡沫复合材料的制备工艺、微观结构、压缩性能和热性能,并结合红外光谱和泡沫在不同压缩应变下的变形破坏形貌,探讨了CNT-COOH对酚醛泡沫的增强机制。结果表明,CNT-COOH作为异相成核剂,使酚醛泡沫泡孔的平均尺寸减小,泡孔密度增大;随着酚醛泡沫中CNTCOOH含量增加,CNT-COOH/酚醛泡沫复合材料的压缩模量和压缩强度提高。红外分析表明,CNT-COOH可能未与酚醛泡沫发生固化反应。CNT-COOH/酚醛泡沫复合材料在不同压缩应变下的SEM分析表明,CNTCOOH位于泡孔的孔壁上,并通过CNT-COOH/酚醛泡沫的界面传载作用承受了一定载荷,增强了泡沫的力学性能。热重分析和垂直燃烧试验表明,CNT-COOH作为稳定剂,降低了泡沫的热降解速率,使其热稳定性和阻燃性能均略有提高。
The fabrication, microstructure, compressive property and thermal performances of the phenolic foam reinforced with carboxyl carbon nanotubes（CNT COOH） were studied. The reinforcement mechanism of CNT- COOH was investigated by analyzing FTIR and detailed failure behavior of 0.05% （mass fraction） CNT COOH/ phenolic foam composite and phenolic foam under different compressive strains. It is found that serving as the site of heterogeneous nucleation, CNT-COOH increases the cell density and decreases the cell size of the produced foams, and that CNT-COOH reinforced foams are evidently stiffer and stronger than the corresponding neat system as the increment of CNT-COOH content. FTIR reveals that curing reaction of CNT COOH and phenolic resin may not exist. SEM analysis of the composite foams in different compressive strains reveals that adding CNT COOH located in the ceil wails could endure a certain load through the interface between CNT COOH and phenolic resin, thereby enhancing the compressive strength of CNT- COOH/phenolic foam composites. In addition, thermogravimetric analysis （TGA） and vertical burning method show that CNT COOH as stabilizer, reduces thermal degradation rate, leading to slightly higher thermal stability and resistance to flame of the foam composites.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2013年第5期14-20,共7页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51103003)
关键词
纳米复合材料
酚醛泡沫
碳纳米管
力学性能
阻燃性能
nanocomposite
phenolic foam
carbon nanotubes
mechanical property
flame retardance
