醋酸纤维素/SiO2纳米纤维复合气凝胶的制备及性能研究
Preparation and Properties of Cellulose Acetate/Silicon Dioxide Nanofiber Composite Aerogel
叶子涵 1黄涛 1俞彬 1俞昊1
作者信息
- 1. 东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海 201620
- 折叠
摘要
以醋酸纤维素(CA)为原料,引入封闭水性异氰酸酯(BIC)与双马来酰亚胺树脂(BMI)双重交联,通过静电纺丝制备得到CA/BMI/BIC纳米纤维;将SiO2纳米纤维作为无机增强相添加至CA/BMI/BIC纳米纤维的分散液中,通过冷冻干燥技术和热处理工艺制备CA/BMI/BIC/SiO2复合气凝胶(CBBSiNFA);探讨了 SiO2纳米纤维的添加量对于CBBSiNFA力学性能、隔热性能和阻燃性能的影响.实验结果表明:随着分散液中SiO2纳米纤维添加量的逐渐增加,CBBSiNFA的压缩应力、比强度、导热系数和阻燃性能逐步提高;当SiO2/CA/BMI/BIC纳米纤维的质量比由0.2增加至1.0后,CBBSiNFA在60％应变下的压缩应力由0.53 kPa提高至2.25 kPa,导热系数由29.00 mW/mK增加至31.02 mW/mK,且CBBSiNFA-1.0压缩循环1 000次后杨氏模量与最大应力都保持在初始量的97％以上,塑性形变为9.6％;CBBSiNFA具有良好的力学可调控性、弹性、隔热以及阻燃性能.
Abstract
CA/BMI/BIC nanofibers were electrospun from cellulose acetate(CA)with the incorporation of blocked waterborne isocyanate(BIC)and double crosslinking using bismaleimide resin(BMI).SiO2 nanofibers were introduced into the dispersion of CA/BMI/BIC nanofibers as an inorganic reinforcement phase.Subsequently,the CA/BMI/BIC/SiO2 composite aerogel(CBBSiNFA)was fabricated through freeze-drying technology followed by heat treatment.The impact of SiO2 nanofiber addition on the mechanical properties,thermal insulation properties,and flame retardancy of CBBSiNFA was systematically investigated.The results revealed a progressive enhancement in compressive stress,specific strength,thermal conductivity,and flame retardant performance of CBBSiNFA with an increasing amount of SiO2 nanofibers.As the mass ratio of SiO2/CA/BMI/BIC nanofibers increased from 0.2 to 1.0,the compressive stress at 60％strain for CBBSiNFA increased from 0.53 kPa to 2.25 kPa.Simultaneously,the thermal conductivity rose from 29.00 mW/mK to 31.02 mW/mK.Remarkably,even after undergoing 1 000 compression cycles,the Young's modulus and maximum stress of CBBSiNFA-1.0 retained over 97％of their initial values,exhibiting a plastic deformation of 9.6％.Overall,CBBSiNFA demonstrated favorable mechanical controllability,elasticity,thermal insulation properties,and flame retardant.
关键词
醋酸纤维素纳米纤维/二氧化硅纳米纤维/静电纺丝/气凝胶/力学性能/阻燃性能/隔热保暖Key words
cellulose acetate nanofiber/SiO2 nanofiber/electrospinning/aerogel/mechanical property/flame retardant performance/thermal insulation properties引用本文复制引用
出版年
2024
NETL
NSTL
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