Effect of Cellulose Nanocrystalline Modification of Graphene Oxide on Curing Kinetics of Epoxy Resin
Nanofillers GC were prepared by modifying graphene oxide(GO)with cellulose nanocrystals(CNC),and epoxy resin(EP)/GC composite nanomaterials were prepared.The effects of GC on the curing kinetics of EP-based composites were studied through differential scanning calorimetry(DSC)testing.The relevant curing kinetics parameters of EP/GC composite nanomaterials were obtained via Kissinger and Ozawa methods.The results indicate that compared with one single nanofiller GO or CNC,composite nano filler GC can more effectively reduce the curing characteristic temperatures(curing initial temperature,curing peak temperature and curing terminal temperature)of EP,promoting the curing process to proceed at lower temperatures.At the same curing temperature,the curing degree of EP/GC material is higher.In the early stage of curing,the curing rate of EP/GC material is faster and the peak curing rate can be reached faster.According to the Kissinger method,compared to pure EP,the Ea of EP/GC material decreases by14%from 52 687 J/mol to 45 234 J/mol.According to the Ozawa method,compared to pure EP,the apparent Ea of EP/GC material is lower at the same conversion rate.The composite nanofiller GC has a more significant promoting effect on the curing process of the EP system and has a more significant catalytic effect on the curing reaction.
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