Abstract
One kind of side chain liquid crystal epoxy (S-LCE) based on biphenyl mesomorphic unit is synthesized from 2,2-bis(hydroxymethyl)propionic acid,4-phenylphenol,and epichlorohydrin.And the intrinsic thermal conductive liquid crystal epoxy film (LCEF) simultaneously combining with intrinsic self-healing performance is then prepared via thiol-epoxide nucleophilic ring-opening reaction and coating method.1 H NMR and FTIR show that S-LCE and LCEF have been successfully prepared.S-LCE presents nematic liquid crystal from room temperature to 160 ℃.LCEF maintains nematic liquid crystal performance and shows highly intrinsic thermal conductivity & excellent self-healing performance.Thermal conductivity coefficient (λ) values in vertical direction (λ⊥) and parallel direction (λ‖) of LCEF are 0.33 and 1.25 W/mK,respectively,much higher than that of general bisphenol A epoxy resin (E-51,λ⊥ of 0.19 W/mK and λ‖ of 0.65 W/mK).Tensile strength of LCEF is 10.6 MPa,which can maintain at 90.6 ％ and 61.3 ％ after one and four cycles of self-healing behavior,respectively.in addition,LCEF presents a wide service temperature range (-9.8-251 ℃) and good thermal stability (THRI of 148.5 ℃).Simultaneously,LCEF has good transparency,flexibility,and tailorability,expected to be utilized in the fields of flexible electronic devices and intelligent structures.
基金项目
support and funding from Guangdong Basic and Applied Basic Research Foundation(2019B1515120093)
国家自然科学基金(51773169)
国家自然科学基金(51973173)
Fundamental Research Funds for the Central Universities(310201911py010)
Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province(2019JC-11)
Open Fund from Henan University of Science and Technology(2020-RSC01)
Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX201920)
Analytical & Testing Center of Northwestern Polytechnical University for TEM test()
NETL
NSTL
维普
万方数据