A series of polysulfonamide (PSA)/TiO 2 modifier nano-composite films were successfully prepared by in-situ polymerization at a low temperature based on 4, 4-diaminodiphenylsulfone and terephthaloyl chloride in the common solvent N, N-dimethylacetamide (DMAc). It was shown that the nano particles were well dispersed in the polymer substrate. Mean-while, PSA/TiO 2 /modifier composites exhibited good UV-resistant properties and mechanical properties. In addition, the composites' heat stability improved. These prepared composites are promising in preparing spinning solution and might have potential application in heat-resistant fiber.
In order to improve the toughness of the cured aromatic tetrafunctional epoxy resins,a dimer carboxylic acid named dimer fatty acid(DFA)was used to modify an aromatic tetrafunctional epoxy,N,N,N',N'-tetraglycidyl-2,2-bis[4-(4-aminophenoxy)phenyl]propane(TGBAPP).The curing behaviors of DFATGBAPP/MNA(methyl nadic anhydride)systems were studied by differential scanning calorimetry(DSC)method.And the thermal properties of the cured epoxy resin were investigated with the thermo-gravimetric analysis(TGA)and dynamic mechanical analysis(DMA).Besides,the toughness was characterized with the impact strength tested by charpy impact testing.The results indicated that the modification would improve the curing reactions,and the curing temperatures were decreased with the increasing content of DFA.The thermal properties were not influenced obviously,and the toughness could be improved when the epoxy resin was modified with DFA.
