Synthesis Of Inorganic-organic Hybridized Intumescent Flame Retardant And Its Modification Bismaleimidodi-phenyl Methane/diallyl Bisphenol A (BDA/DBA) Resin

High performance thermosetting resins (HPTRs) are a class of polymers withcross-linked network structure, owing to their outstanding integrated properties, showinggreat potential in aerospace, electric and electronic industries. However, compared with theinorganic and metal materials, HPTRs generally have poor flammability, which is onemajor disadvantage to restrict further applications in cutting-edge fields. Many researcheshave proved that adding a flame retardant into a polymer is an effective method to prepareflame retarding polymers. Therefore, developing high-efficiency flame retardant forHPTRs has important scientific significance and application value.In the thesis a novel intumescent flame retardant (IFR) with organic-inorganic hybridstructure was prepared. Simultaneously bismaleimide (BMI) resin is selected as the baseresin owing to its outstanding performance and importance in applications of manycutting-edge fields. The flame retardant was used to explore its effect on the bismaleimide(BMI) resin.First, HPSi-IFR is synthesized through the condensation reaction between P-Cl inSPDPC and amino-group in AHPSi, HPSi-IFR shows a three-dimensional structure withhigh molar mass. FTIR, NMR, XRD and EDS measurements were used to characterize itsstructure and composition. Thermal stability and char-forming performance werecharacterized by thermal gravimetric analysis (TGA), the results shows that the HPSi-IFRhas more excellent thermal stability and char-forming ability than the traditionalIntumescent Flame Retardant (IFR), the components of the HPSi-IFR react to form acompact and smooth char, the Si-O-Si chains strengthen the final char.Secondly, we have prepared for BDM/DBA and BDM/DBA/HPSi-IFR resins, andexplored their thermal property and flame retardant property. Though thethermodegradation kinetics research, with10wt%addition of HPSi-IFR into BDM/DBA resin, the maximum Eavalue (491.4KJ/mol in air and1130.4KJ/mol in N2) is about2.5and3.2times of that of BDM/DBA resin, respectively. With only5wt%addition, the heatrelease capacity, the total and maximum heat release are only63%,55%and67%of thoseof BDM/DBA resin, respectively. To reveal the mechanism behind the attractive flameretarding effect of HPSi-IFR, the char formation chemistry were intensively studied.Results show that HPSi-IFR greatly improves the ability of producing stable andcondensed barrier that prevents the heat and mass transfer.