Study On The Properties Of TPGDA/CTBN Modified Epoxy Resins

In this paper,one kind of excellent polymer material was made choosing TPGDA and CTBN as functional phase,epoxy resins as polymer matrix,diamionalkoxy (polyether amines)and polyethylene multi-amine as curing agent.The mechanical property,microstructure and damping property of the polymer materials was studied.The suitable curing temperature of epoxy resins is 50℃,the epoxy resins could fully cured through 6 hours and the product has good mechanical properties.With the chemical modification,prepared the liquid carboxyl-terminated butadiene-acrylonitrile(CTBN)modified epoxy resin.Analyzed the CTBN modified epoxy resin's structure with FTIR and determined the chemical modified condition through the epoxy value determination;Compared with the mechanics performance and the viscosity of the different CTBN modified epoxy resin,indicated the bending strength,tensile strength and modulus of CTBN modified epoxy resin were declined, rate of break-off elongation and Impact strength were increased.;the SEM analysis indicated that after chemical modification,in the epoxy resin,CTBN and the epoxy resin occurred separated,and formed the phase heterogeneity shape structure of the CTBN hole as the dispersed phase,the epoxy resin as the continuous,the 20% CTBN-25 modified epoxy resin initiated the maximizing silver grain and the shear zone;the plasticizing effect was this time bestAdding acrylate into the liquid carboxyl-terminated butadiene-acrylonitrile (CTBN)modified epoxy resin prepared a novel excellent material,by FTIR shows,the carboxyi-terminated of CTBN can reacted With the hydroxyl of TPGDA forming ester groups,and the epoxy groups of the epoxy resins also can reacted with the hydroxyl of TPGDA,thus TPGDA and CTBN modified epoxy resins formed a good interface combination.the DSC and particle distribution analysis displayed that the polyacrylate hadn't form elastic particles and its long chains were twisted with the chains of CTBN and epoxy resins,consequently forming triphase IPNs structures. SEM analysis exhibited further that TPGDA through free radical initiation reaction formed polymer chains which twisted with the chains of CTBN and epoxy resins,thus polyacrylate/CTBN modified epoxy resins formed semi-IPN structure and the toughness of epoxy resins were improved,by adding acrylate into the liquid carboxyl-terminated butadiene-acrylonitrile(CTBN)modified epoxy resin,the development of epoxy systems formed semi-IPNs structure and kept epoxy resin's properties and increasesd its toughness,and these are expected to find extensive application as high-powered adhesives. Though the CTBN modified epoxy resin had high damping peak and wide damping temperature,the Tg was so high and the viscoelasty was so big that the polymer material was not suitable for using as pouring adhesive.The DMA analyesis of TPGDA/CTBN modified epoxy resins system studied the influence of the content of TPGDA,kind of CTBN,flexible epoxy composite and different techonogy,and indicated that adding TPGDA,flexible epoxy composite could reduce the Tg of the damping peak.Comparaed all influence factor and dispensation,the method of 10% TPGDA directly curing with the CTBN modified epoxy resin was best.The optimum concentration was as follows:the CTBN modiafied epoxy resins,100 share;TPGDA,10 share;polyether amines,40 share;polyethylene multi-amine,3.4 share;flexible epoxy composite,30 share;660A,10 share.