Synthesis Of Bio-based Epoxy Resin Based On Eugenol And Research On Composite Material Performance

Nowadays,there are two severe problems to be solved in the society: the environmental pollution of waste materials and the exhaustion of fossil energy.Therefore,sustainable development technology has attracted more and more attention.So far,the application fields of epoxy resins have spread throughout the fields of coatings,adhesives and composite materials.The most currently used energy is still non-renewable petrochemical resources,which does not meet the requirements of green development,and future applications will inevitably be restricted.Therefore,the development of bio-based epoxy resin to gradually replace the existing petroleum-based epoxy resin has important practical significance.However,the mechanical properties of bio-based epoxy resins are usually not comparable to petroleum-based epoxy resins.The usual solution is to add nano-fillers to bio-based resins.In this paper,through molecular design,eugenol-based epoxy monomers were synthesized,boron nitride was modified with KH560,clay was modified with Girard reagent T,and a series of "interfacial interaction" and "nanocomposite" principles were combined.High-performance eugenol-based epoxy resin nanocomposite.The main findings are as follows:1.This chapter uses eugenol,epichlorohydrin and 1.1.3.3-tetramethyldisiloxane as the main raw materials to synthesize a bio-based epoxy resin(EUEP-Si),and select four different Amine curing agent: Isophorone diamine(IPDA),Cardolite LITE2002 curing agent,polyetheramine(D230)and diethylene triamine(DETA),which undergo curing reaction to prepare a series of eugenol-based thermosets material.The effect of curing agents on the mechanical and thermal properties of the final products was studied,with the aim of selecting a suitable curing agent for further research.The experimental results show that all four curing agents can be cured with bio-based epoxy resin,and the rigid curing agent IPDA-EU cured by IPDA exhibits the greatest mechanical properties(29.37MPa)and the highest glass transition temperature(47.55 ℃)and good storage modulus(1319MPa).The long-chain flexible curing agent D230 has the highest storage modulus(1512MPa).The results show that this work is worthy of further research and lays the foundation for the next work.2.In this chapter,the hexagonal boron nitride(h-BN)is pretreated with the strong alkali Na OH solution to make the surface of h-BN carry more hydroxyl groups to obtain surface hydroxylated boron nitride(BN-OH).And then γ-glycidoxypropyltrimethoxysilane(KH560)was used to react with hydroxylated boron nitride(BN-OH)to connect the silane coupling agent to the surface of the boron nitride nanoparticles.Adding it to eugenol epoxy resin(EUEP),IPDA as a curing agent,prepared a series of eugenol-based epoxy nanocomposites.Compared with pure bio-based eugenol epoxy resin,the mechanical properties,thermal stability,and friction resistance of EUEP/BN nanocomposites are greatly improved.The friction coefficient of the composites with 2wt%BN-KH560 is reduced from 0.711 to 0.498,The storage modulus increased from 1004 MPa to1856MPa.The tensile strength increased from 25.92 MPa to 29.82 MPa.This is because the surface of the modified BN-KH560 has groups that can react with the curing agent.These nanofillers can participate in the reaction during the curing process to form cross-linking points and build a strong interface effect.At the same time,the number of active groups on the surface of the nanofiller increases,and it can be better dispersed in the epoxy matrix.This work has further improved the properties of bio-based epoxy resins and provides a way of thinking for the use of bio-based epoxy resins.3.Choose Giraert reagent T to modify nanoclay to obtain organically modified clay(T-Clay),and prepare a series of eugenol-based nanocomposites through the "slurry compound method".After TGA,XRD,FT-IR,TEM and other tests,the results showed that: T-Clay formed a random release structure in the bio-based epoxy resin that was evenly dispersed in the resin matrix.T-Clay itself is reactive and can participate in the curing reaction to build an interface force between the bio-based epoxy and T-Clay.The mechanical strength of the composite material with 2wt% T-Clay added reaches 37.49 MPa,which is 51.71% higher than the 24.71 MPa of pure bio-based epoxy resin.The glass transition temperature of the 2wt% T-Clay composite material reached 54.36℃,which was 9.3 ℃ higher than the 45.06 of pure bio-based epoxy resin.The improvement of these properties makes the bio-based epoxy nanocomposite material have a wider application range,and provides a new idea for the development of bio-based epoxy resin.