Synthesis of poly(ionic liquid) for trifunctional epoxy resin with simultaneously enhancing the toughness,thermal and dielectric performances |
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| Authors: | Bingyan Yin Wenqing Xu Chengjun Liu Miqiu Kong Yadong Lv Yajiang Huang Qi Yang Guangxian Li |
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| Affiliation: | School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065 People''s Republic of China.; College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065 People''s Republic of China |
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| Abstract: | Poly(ionic liquid) (PIL), integrating the characteristics of both polymers and ionic liquid, is synthesized and employed to modify diglycidyl-4,5-epoxy-cyclohexane-1,2-dicarboxylate (TDE-85). With the addition of PIL, the fracture toughness, and thermal and dielectric performances of TDE-85 were discovered to be simultaneously improved, meanwhile the tensile modulus and strength is increased. Upon an optimal loading of 3 wt% PIL, the critical stress intensity factor (KIC), tensile modulus and strength are raised by 92.9%, 13.3% and 10.7%, respectively. Multi-toughening mechanisms due to spherical domains of PIL formed in TDE-85 during curing are responsible for the improved toughness. Moreover, the dielectric and thermal properties of TDE-85 are also enhanced by adding PIL. With the optimal addition of 5 wt% PIL, the dielectric constant of the composites is enhanced by 62.5%, the glass transition temperature is increased by 16.58 °C and the residual weight of carbon is increased by 59%.This work will provide a strategy to obtain epoxy with relatively high toughness, thermal and dielectric properties. |
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