Abstract

This study investigated the effects of loadings of cellulose nanocrystals (CNC) extracted from jute fibers on the chemical, mechanical and thermal properties of the Epoxy matrix. The CNC/Epoxy composites were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometry, tensile tests, dynamic mechanical analysis, and thermogravimetric analysis. Experimental results showed that the tensile strength, modulus, and work of fracture showed a statistically significant increase from 1 to 5 wt.% CNC loading. In addition, TG measurements revealed that the onset temperature (T_onset) and temperature at maximum decomposition rate (T_max) for composites decreased compared to neat epoxy with increasing CNC concentration. Dynamic mechanical analysis studies showed that the storage modulus values at 35 °C and 120 °C decreased for lower 1 wt% CNC content sample compared to neat epoxy, then increased for samples loaded with 3 and 5 wt% of CNC.

摘要

本研究调查了从黄麻纤维中提取的纤维素纳米晶体 (CNC) 的负载量对环氧树脂基质的化学、机械和热性能的影响。通过扫描电子显微镜 (SEM)、傅里叶变换红外光谱、拉伸试验、动态力学分析和热重分析对 CNC/Epoxy 复合材料进行了表征。实验结果表明，从 1 到 5 wt.% CNC 负载，拉伸强度、模量和断裂功在统计学上显着增加。此外，TG 测量表明，起始温度 (T _onset ) 和最大分解速率时的温度 (T _max) 与纯环氧树脂相比，复合材料随着 CNC 浓度的增加而降低。动态力学分析研究表明，与纯环氧树脂相比，CNC 含量较低的 1 wt% 样品在 35 °C 和 120 °C 下的储能模量值降低，然后负载 3 和 5 wt% CNC 的样品增加。