Modification Of A Novel Trifunctional Epoxy Resin And Study Of Curing Behavior At Room Temperature

With the development of the technology,there is higher requirement of application of epoxy resin.To solve the problem of brittleness of epoxy resin,people continue to research the methods of toughening.And they want epoxy resin to have good curing properties at room temperature.This thesis employed a simple process for preparation of a nano-SiO2 modified trifunctional epoxy resin(TEP),which has higher toughening property,and re-search curing behavior of TEP at room temperature.First nano-SiO2 and TEP resin are uniformly fixed by physical blending.Then,modi-fied resin is cured with 15%DDCM+4%2E4MZ.Cured sample need to have a performance tests.The influence of resin viscosity and the impact strength,hardness,corrosion of cured material with changing content of nano-SiO2 are studied in this research.It shows that when mass percentage comes to 2%,the material has best toughening.But TGA and DMA analysis showed that modified TEP resin has lower thermal stability.The curing behavior of TEP at room temperature is studied by using a lot of iso-phorone diamine.It shows that IPDA+2E4MZ and modified IPDA by Mannich have better curing behavior than IPDA and it shows better properties.15IPDA+4%2E4MZ system has the best capability of curing at room temperature.The curing reaction kinetics of three curing systems is studied by DSC.The glass tran-sition temperatures were measured by using Dynamic thermo mechanical analysis(DMA),and we tested the corrosion resistance of the resin cured film in various chemicals.The re-sults showed that,IPDA+2E4MZ has a slightly lower apparent activation energy,and the curing reaction has higher degree of cure;and the Tg,corrosion resistance are superior to single IPDA and modified IPDA.