在羧基化纳米纤维素(CNF)增韧环氧树脂(EP)研究基础上,利用物理共混法,以水性聚氨酯(WPU)为增韧剂,制备了羧基化纳米纤维素/水性聚氨酯/水性环氧树脂(CNF/WPU/WEP)复合材料,并通过力学性能测试研究了WPU对CNF/WEP复合材料的增韧效果。通过扫描电子显微镜、X射线衍射仪、热重分析仪研究了WPU对CNF/WEP复合材料的增韧机理以及热稳定性的影响。结果表明:当WPU质量分数为15%时,增韧效果最佳;CNF/WPU/WEP复合材料拉伸强度达到25.39MPa,冲击强度达到205.22kJ/m2,初始分解温度可达到307℃。
Based on the research of carboxylated nanocellulose (CNF)-toughened epoxy resin (EP),carboxylated nanocellulose/waterborne polyurethane/waterborne epoxy resin (CNF/WPU/WEP) composites were prepared using physical blending method with waterborne polyurethane (WPU) as toughening agent.The toughening effect of WPU on CNF/WEP composites was studied through mechanical property tests.The toughening mechanism and thermal stability of CNF/WEP composite materials by WPU were studied using scanning electron microscopy,X-ray diffraction,and thermogravimetric analysis.The results showed that the toughening effect was optimal when the WPU mass fraction was 15%.The tensile strength of CNF/WPU/WEP composite reached 25.39MPa,the impact strength reached 205.22kJ/m2,and the initial decomposition temperature was up to 307℃.
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基金资助
国家自然科学基金(51143005);湖北省自然科学基金(2010CDB05805)
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