摘要
利用γ-氨丙基三乙氧基硅烷(KH-550)及碱液和KH-550复合的方法对桉木纤维进行预处理,制备桉木纤维-酚醛泡沫复合材料。分析了预处理方法对桉木纤维分子结构、结晶性能和微观形貌的影响,以及预处理方法对桉木纤维复合泡沫机械性能、燃烧性能、隔热性能、微观形貌等性能的影响。结果表明,预处理改变了桉木纤维的微观结构,增强了纤维的结晶度,改善了桉木纤维与酚醛树脂间的界面相容性,复合泡沫的各项性能显著提高,其中弯曲和压缩强度最大提高了约45%和112%,粉化率、导热系数和泡孔孔径最多降低了80.3%,6.8%和300.0%,但预处理对阻燃性无促进作用,复合泡沫的极限氧指数最大降低了13.4%。综合分析可知,KH-550直接处理的复合泡沫各项性能较优,且纤维的质量分数应控制在5%以内。
bEucalyptus fiber-phenolic foam composites were prepared by the eucalyptus fibers,which were pre-treated with γ-amino propyl triethoxy silane（ KH-550） and the combined method of alkali liquorto and KH-550. The effects of pretreatment methods on the molecular structure,crystallization and microstructure properties of eucalyptus fibers,mechanical properties,flammability property,thermal conductivity and microstructure of foam composites were studied. The results showed that the microstructure of eucalyptus fiber was changed,and crystallinity increased. The interfacial compatibility was significantly improved between eucalyptus fibers and phenolic resin. Various properties of foam composites were improved to some extent. The maximum bending and compression strength increased by about45% and 112%,respectively. The pulverization rate,thermal conductivity and the size of bubble hole decreased by80.3%,6.8% and 300.0%,respectively. However,no improvement in flame retardancy was found after the pretreatment because the maximum limited oxygen index of the foam composite reduced by 13.4%. In summary,the results of comprehensive analysis indicated that the performances of foam composites made from KH-550 pretreated fibers were better than that of other methods,and the dosage of fibers should be controlled within 5%.
出处
《林业工程学报》
北大核心
2018年第1期97-102,共6页
Journal of Forestry Engineering
基金
江苏省自然科学青年基金(BK20140978)
南京林业大学青年科技创新基金(CX2016011)
南京林业大学高学历人才基金(GXL2014033)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
桉木纤维
预处理
酚醛泡沫复合材料
性能表征
eucalyptus fiber
pretreatment
phenolic foam composites
characteration
