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Waterborne epoxy sizing agent with hyperbranched structure to improve the interface performance of carbon fiber
Polymer Composites ( IF 4.8 ) Pub Date : 2021-01-14 , DOI: 10.1002/pc.25928 Yifan Chen 1 , Lei Ding 1 , Mingzhuo Chai 1 , Li Liu 1, 2 , Yudong Huang 1
Polymer Composites ( IF 4.8 ) Pub Date : 2021-01-14 , DOI: 10.1002/pc.25928 Yifan Chen 1 , Lei Ding 1 , Mingzhuo Chai 1 , Li Liu 1, 2 , Yudong Huang 1
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The epoxy resin was modified by hyperbranched structure of hydroxyl terminated to obtain waterborne epoxy resin for using as the carbon fiber (CF) sizing agent. By mixing method of waterborne epoxy resin and water, the waterborne epoxy sizing agent can be fabricated directly. In the sizing process, free of volatile organic solvents ensure the safety of operators and environment. Moreover, the introduction of tertiary amine group in hyperbranched structure will promote the reaction between epoxy and hydroxyl groups, and thus enhance the bonding strength between CF and epoxy resin. Results showed that the introduction of sizing agent does not sacrifice the CF single fiber tensile strength. The structure of epoxy resin retained in sizing agent is beneficial to the good wettability between CF and epoxy resin according to surface energy results. Interfacial shear strength value increases from 51.75 to 72.34 MPa, and interlaminar shear strength value increases from 80.32 to 90.34 MPa. These mechanical properties show that hyperbranched epoxy resin sizing agent with a large amount of hydroxyl groups can effectively improving the interface adhesion between CF and epoxy resin, showing a broad application prospect in composite materials field.
中文翻译：
具有超支化结构的水性环氧施胶剂，可改善碳纤维的界面性能
通过羟基封端的超支化结构对环氧树脂进行改性，以获得用作碳纤维（CF）上浆剂的水性环氧树脂。通过水性环氧树脂与水的混合方法，可以直接制备水性环氧树脂上浆剂。在施胶过程中，不含挥发性有机溶剂可确保操作人员和环境的安全。此外，在超支链结构中引入叔胺基团将促进环氧基与羟基之间的反应，从而增强CF与环氧树脂之间的结合强度。结果表明，上浆剂的引入并没有牺牲CF单纤维的抗张强度。根据表面能的结果，保留在上浆剂中的环氧树脂的结构有利于CF与环氧树脂之间的良好润湿性。界面剪切强度值从51.75 MPa增加到72.34 MPa，层间剪切强度值从80.32 MPa增加到90.34 MPa。这些机械性能表明，具有大量羟基的超支化环氧树脂上浆剂可以有效地改善CF与环氧树脂之间的界面附着力，在复合材料领域具有广阔的应用前景。
更新日期：2021-01-14
中文翻译：
具有超支化结构的水性环氧施胶剂，可改善碳纤维的界面性能
通过羟基封端的超支化结构对环氧树脂进行改性，以获得用作碳纤维（CF）上浆剂的水性环氧树脂。通过水性环氧树脂与水的混合方法，可以直接制备水性环氧树脂上浆剂。在施胶过程中，不含挥发性有机溶剂可确保操作人员和环境的安全。此外，在超支链结构中引入叔胺基团将促进环氧基与羟基之间的反应，从而增强CF与环氧树脂之间的结合强度。结果表明，上浆剂的引入并没有牺牲CF单纤维的抗张强度。根据表面能的结果，保留在上浆剂中的环氧树脂的结构有利于CF与环氧树脂之间的良好润湿性。界面剪切强度值从51.75 MPa增加到72.34 MPa，层间剪切强度值从80.32 MPa增加到90.34 MPa。这些机械性能表明，具有大量羟基的超支化环氧树脂上浆剂可以有效地改善CF与环氧树脂之间的界面附着力，在复合材料领域具有广阔的应用前景。
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