摘要
对位芳纶沉析纤维是近年来新开发的一种对位芳纶差异化产品,因其具备良好的湿加工性和复合效果,故作为复合增强材料得以广泛应用.为了解这种新型纤维的本体结构特性以及其在纸基复合材料中的应用情况,本文采用LM、SEM等表征了该纤维的表观形貌,通过Morfi Compact分析了其形态参数,并利用FT-IR、XRD等研究了其结构特性,运用压汞仪、TG-DSC等探讨了沉析纤维对纸基复合材料性能的影响.结果表明:相对于浆粕纤维,沉析纤维呈非刚性的皱膜状或薄片状,形态柔顺,质轻且较薄,比表面积较大,在水介质中分散性良好;纤维的长度较小且分布集中,细碎化程度高,有利于提高其复合材料的匀度和强度;纤维具有聚酰胺结构,其氢键结合程度偏低,呈现出明显的无定形态结构;由于沉析纤维独特的形态特性,用其配抄所得纸基复合材料结构紧凑,孔隙较少,机械强度、绝缘性能以及热学稳定性等均有明显提高,说明对位芳纶沉析纤维作为芳纶纸基复合材料具有良好的性能.
Poly(para-phenylene terephthalamide)fibrid is a new PPTA differentiated product developed in recent years,and it can be used as composite reinforcement materials since it has good wet processing and compounding effects.In order to investigate the structure and properties of this new fiber and its application in paper based composite,LM and SEM were used to characterize its apparent morphology,Morfi Compact was used to analyze its morphological parameters,FT-IR and XRD were used to study its structural properties,and the mercury analyzer and TG-DSC were used to reveal the effects of fibrids on the properties of paper based composites.The results show that fibrids appear like non-rigid wrinkle film or sheet relative to pulp,its morphology is flexible and it has a larger specific surface area as it is light and thin,besides it has a good dispersibility in an aqueous medium.Fibrid has a smaller length and distributes centralizedly,and its high degree of fragmentation is conducive to the uniformity and strength of its composite materials.Fibrid has polyamide structure and it has low hydrogen bonding degree and obvious amorphous structure.Due to its unique morphological characteristics,PPTA paper based composite which is made of chopped fiber and fibrids has compact structure and less porosity,besides the mechanical strength,insulation performance and thermal stability of this kind paper increase obviously,indicating that fibrids can be used as aramid paper based composite materials with excellent performance.
出处
《陕西科技大学学报(自然科学版)》
2015年第4期1-6,12,共7页
Journal of Shaanxi University of Science & Technology
基金
国家863高技术研究发展计划重大项目(2012AA03A208)
陕西省科技厅科技统筹创新工程计划项目(2011ktcg01-19)
陕西科技大学博士科研启动基金项目(BJ12-17)
关键词
对位芳纶纸
对位芳纶沉析纤维
形态分析
结构性能
para-aramid paper
para-aramid fibrid
morphological analysis
structure and properties