纳米纤维素增强的水性环氧树脂体系的制备及性能

Preparation and performance of nanocellulose enhanced waterborne epoxy resin system

以聚乙二醇和环氧树脂预聚体为原料合成乳化剂,并将其与环氧树脂、去离子水以及不同用量的纳米纤维素纤维(CNF)水溶液采用相反转法制备了水性环氧树脂体系。通过静置和离心稳定性实验研究了CNF对水性环氧树脂体系稳定性的影响。采用热重分析和力学性能测试研究了固化后样品的性能。结果表明:CNF均匀分散的水性环氧树脂体系具有较好的稳定性。添加CNF能够提高固化样品的热稳定性和力学性能。当CNF的添加质量分数0.2%时,固化物力学性能最佳,其拉伸强度、冲击强度较纯环氧树脂体系分别提高了2.5%和27.7%。

The emulsifier was synthesized from polyethylene glycol and epoxy resin prepolymer.The waterborne epoxy resin systems were prepared by phase inversion method with the emulsifier,epoxy resin,deionized water and different contents of nanocellulose fiber(CNF) aqueous solution.The effects of CNF on the stability of waterborne epoxy resin systems were investigated by static and centrifugal stability experiments.The properties of the cured samples were investigated by thermogravimetric analysis and mechanical property testings.The results showed that the waterborne epoxy resin system with uniform dispersion of CNF had good stability.The thermal stability and mechanical properties of the cured samples were improved by addition of CNF.When the mass fraction of CNF was 0.2%,the mechanical properties of the cured product were the best,and its tensile strength and impact strength were increased by 2.5% and 27.7%,respectively,compared with the pure epoxy resin system.