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摘要
采用酸水解法从微晶纤维素中提取纤维素纳米晶(CNC),再分别用硅烷偶联剂和2,2,6,6-四甲基哌啶氧化物(TEMPO)氧化剂对纤维素纳米晶进行改性,然后采用浇铸成膜法制备纯环氧树脂膜、含量为5% CNC、偶联改性CNC(K-CNC)及其TEMPO氧化改性CNC(T-CNC)/环氧树脂(EP)复合材料。利用扫描电子显微镜、透射电子显微镜、紫外-可见分光光度计、热重分析仪和万能材料试验机对试样表面薄膜形貌结构、透光性能、热学性能、机械性能进行测试。结果表明:加入T-CNC及其K-CNC的EP复合材料,断面比纯EP膜更加粗糙,裂纹增加。加入CNC及改性后的CNC,EP复合材料的透光率有所降低,T-CNC/EP复合膜的透光率为83.9%,降低幅度最小,K-CNC/EP膜的拉伸强力为38.37MPa,拉伸强力最大,K-CNC/EP膜弹性模量为513.89MPa,和纯EP膜相比,其弹性模量增加了36.8%,T-CNC/EP及K-CNC/EP复合膜的热分解温度分别增加了7℃和10℃,热稳定性得以改善。
Abstract
In this article,cellulose nanocrystals (CNC) were prepared from microcrystalline cellulose by acid hydrolysis.Then the CNC was modified by silane coupling agent and TEMPO.After that,Pure epoxy,epoxy nanocomposites reinforced with 5wt% CNC,surface alkylation of CNC(K-CNC) and TEMPO-mediated oxidation of CNC(T-CNC) were prepared via the solution casting method.Infrared spectroscopy,transmission electron microscope,scanning electron microscope,ultraviolet-visible spectrophotometer and dynamic mechanical analyzer were used to test the morphology,light transmission,thermal and mechanical properties of the composite materials.Experimental results showed that compared with pure epoxy,the nanocomposites reinforced with surface alkylation of CNC and TEMPO-mediated oxidation of CNC enhanced fracture toughness.The light transmittance of epoxy nanocomposites reinforced with CNC and surface modified CNC was lower than that of pure epoxy.The light transmittance of epoxy nanocomposites reinforced with TEMPO-mediated oxidation of CNC was 83.9%,which had minimal reduction.The tensile strength and elastic modules of epoxy nanocomposites reinforced with alkylation of CNC increased by 41% and 36.8% compared to pure epoxy.TG measurements revealed that the thermal stabilities of the nanocomposites reinforced with surface alkylation of CNC and TEMPO-mediated oxidation of CNC were improved.Their thermal decomposition temperature increased by 10℃ and 7℃,respectively.
关键词
纤维素纳米晶改性
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环氧树脂
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复合材料
Key words
cellulose nanocrystals modification
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epoxy resin
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composite materials
纤维素纳米晶改性及其环氧树脂复合材料的制备与性能研究[J].
化工新型材料, 2023, 51(1): 90-94 DOI:10.19817/j.cnki.issn1006-3536.2023.01.018
[1] 刘志宇,王营超,杨鸿嘉,等.纳米纤维素的制备策略及应用实践[J].纸和造纸,2021,40(1):17-27.
[2] 徐峻,高艺,吴祺祺,等.纤维素纳米晶的改性对晶体结构及性能的影响[J].高分子材料科学与工程,2021,37(3):66-71.
[3] 王瑞平,余煌,袁长龙,等.纳米纤维素/环氧树脂复合物用作柔性有机太阳能电池基底[J].精细化工,2019,36(3):144-150.
[4] 胡斌涛,丁英豪,王佳伟,等.纳米纤维素-竹粉改性环氧树脂复合材料研究[J].热固性树脂,2017,32(5):15-18.
[5] 寇彦平.纳米纤维素对环氧树脂改性体系结构及性能影响研究[D].杭州:浙江农林大学,2015.
[6] 卢琳娜,李永贵,卢麒麟.纤维素纳米晶/环氧树脂复合材料的制备及性能研究[J].功能材料,2020,51(1):201-206.
[7] 颜明,宋冰,陆海龙,等.纤维素纳米纤维-环氧树脂复合材料的制备与研究[J].中华纸业,2016,37(14):23-26.
基金资助
江苏省研究生科研与实践创新计划项目(SJCX21-XY012和SJCX21-XY027);盐城市农业科技指导性计划项目(YKN2015011);中国纺织工业联合会科技指导性计划项目(2016061);2021/2022年度江苏省新型环保重点实验室开放课题(JBGS026);盐城工学院2021年大学生创新训练计划项目(序号181);江苏省产学研合作项目(BY2022456)
