纤维特性对芳纶Ⅲ纸蜂窝格壁材料结构与性能的影响

Effects of Fiber Properties on the Structure and Properties of Aramid Ⅲ Paper Honeycomb Lattice Materials

关键词:  芳纶Ⅲ短切纤维  格壁材料  芳纶Ⅲ纸蜂窝  力学性能

Key Words:aramid Ⅲ chopped fiber  lattice materials  aramid Ⅲ paper honeycombs  mechanical properties

摘要:本研究以芳纶Ⅲ短切纤维、间位沉析纤维和水性聚酰亚胺树脂为原料，制备了芳纶Ⅲ纸蜂窝格壁材料，探讨了短切纤维长度和含量对格壁材料结构及拉伸强度、弹性模量、断裂伸长率和撕裂度的影响规律，并通过格壁材料的力学性能参数预测芳纶Ⅲ纸蜂窝的力学性能。结果表明，随着短切纤维长度增加，格壁材料的拉伸强度先降低后增加，弹性模量则增加，芳纶Ⅲ纸蜂窝的压缩及剪切性能的预测值在短切纤维长度为6 mm时最大。随着短切纤维含量增加，格壁材料的拉伸强度和弹性模量均先增大后减小，在短切纤维含量为60%时，分别达到最大值86.3 MPa和5 698 MPa，而撕裂度则增加，并在短切纤维含量为90%时，达到最大值1 081 mN，此时芳纶Ⅲ纸蜂窝的压缩强度的预测值最大，但芳纶Ⅲ纸蜂窝的平压模量、L向和W向剪切模量的预测值在短切纤维含量为80%时达最大值。

Abstract:In this study， aramid Ⅲ paper honeycomb lattice materials were prepared by aramid Ⅲ chopped fibers， meta-precipitated fibers， and water-based polyimide resin as raw materials. The effects of the length and content of the chopped fibers on the structure， tensile strength， elastic modulus， elongation at break， and tearing strength of lattice materials were investigated. Additionally， the mechanical properties of aramid Ⅲ paper honeycomb lattice materials were predicted through the mechanical property parameters of lattice materials. The results showed that as the chopped fiber length increasing， the tensile strength of the lattice materials initially decreased and subsequently increased， while the elastic modulus increased. The predicted values of the compression and shear properties of the aramid Ⅲ paper honeycomb reached their maximum when the of the chopped fiber length was 6 mm. As the chopped fiber content increasing， the tensile strength and elastic modulus of the lattice materials both increased and then decreased， and reached maximum values of 86.3 MPa and 5 698 MPa， respectively， when the chopped fiber content was 60%. The tearing strength increased and reached maximum value of 1 081 mN， when the chopped fiber content was 90%. At this time， the predicted values of compressive strength of the aramid Ⅲ paper honeycomb were the largest， but the predicted values of flat compressive modulus and L-and W-direction shear modulus of the aramid Ⅲ paper honeycomb had the maximum values at 80% of the chopped fiber content.