| Graphene has been widely used in resin-based composite materials because of its outstanding performance advantages in mechanics,thermals and electricity.However,graphene has a general problem of poor dispersibility and weak interface bonding in the resin matrix,which greatly reduces its application effect.In this paper,n-butyl glycidyl ether(BGE)modified 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid(mIL)was introduced into the surface of graphene oxide to prepare ionic liquid-graphene conjugate(mIL-GO)systematically studied the influence of mIL,GO and mIL-GO on the isothermal curing kinetics of epoxy resin,and further explored the surface structure and dispersion state of mIL-GO under microwave conditions for its epoxy composites.The influence of mechanics,thermal conductivity,electrical conductivity and dielectric properties.main tasks as follows:The mIL was synthesized in two steps based on the solvothermal method.Infrared,mass spectrometry,thermogravimetric and other test results show that compared with IL,mIL exhibits a-OH vibration peak at 3400 cm-1,and an ether bond vibration peak appears at 1112 cm-1,indicating that BGE and IL reaction are introduced.Hydroxyl.The effects of different contents of mIL on the physicochemical properties of epoxy were studied systematically based on viscosity,gel time,infrared,TGA and tensile properties.Studies have shown that with the increase of mIL content,the viscosity of the resin gradually becomes lower,the gel time is shortened under microwave curing,the rate of heat and heavy carbon is increased,and the thermal stability is improved.When the amount is increased by 2 wt.%,the stretching is performed.The strength was 82.8 MPa and the tensile modulus was 2.93 GPa.The ionic liquid-graphene conjugate(mIL-GO)was successfully prepared based on microwave method.Infrared,elemental analysis,thermogravimetric test,scanning(SEM),transmission(TEM)and atomic force microscopy(AFM)showed that mIL-GO was successfully obtained,the mIL grafting rate was 41.3 wt%;mIL-GO compared with GO The microstructure is similar to "swelling",the interlayer spacing becomes larger,and the thickness is increased from 0.68 nm to 0.96 nm of GO.Based on the isothermal DSC test method and the theoretical method of Kamal,the effects of mIL,GO and mIL-GO on the solidification mechanism and activation energy of EP system under microwave conditions were systematically studied on the basis of microwave non-thermal effects.Studies have found that microwave curing has a "non-thermal effect" that significantly reduces the activation energy of the EP curing reaction.Since GO increases the steric hindrance to a certain extent,it hinders the curing of epoxy resin,and mIL promotes curing due to the increased microwave absorption capacity.mIL-GO exhibits a remarkable synergistic effect in promoting EP curing reaction under microwave conditions,so that the activation energy of the curing reaction is further reduced,and the curing rate is further improved.Based on the scanning,transmission,OM,mechanical test,DMTA,electrical and thermal conductivity and dielectric properties,the mechanism of the dispersion of mIL-GO and the interfacial activity under microwave curing on the properties of epoxy composites were systematically investigated.Studies have shown that under microwave curing,mIL-GO enhances the microwave absorption capacity of the system through conjugated structure,interfacial polarization,multiple scattering,etc.,ensuring that mIL-GO has good dispersion stability and higher microwave corresponding activity in epoxy resin.It is beneficial to the excellent performance of the mechanics,heat conduction and electric conductivity of the graphene body. |
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