A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolic resin.The reaction between NBENP and resol was measured by FT-IR,and the curing behavior of resins was charactered by DS...A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolic resin.The reaction between NBENP and resol was measured by FT-IR,and the curing behavior of resins was charactered by DSC.The mecanical and thermal properties of modified resins were measured.Fra cture surface of modified phenolic resin was observed by SEM.The results showed that,the impact strength, flexural strength and heat resistance of NBENP modifie d phenolic resin were increased at the same time. A strong interface adhesion wa s formed because of the reaction between hydroxymethyl of resol and NBENP.This s pecial interface conduces to transmission of stress when materials were loaded,a nd inhibition of deformation and decomposition of phenolic matrix when heated.Th e microcrack,initiated with rubber particle,and cavitation of rubbers might be t he main reason for increase in toughness.The honeycomb structure in fracture sur face might be another possible reason for excellent mechanical properties.展开更多
According to the present theories of plastic toughening, it is impossible to enhance the toughness, stiffness and/orheat resistance of plastics simultaneously by using rubber. A series of novel nano-rubber particles (...According to the present theories of plastic toughening, it is impossible to enhance the toughness, stiffness and/orheat resistance of plastics simultaneously by using rubber. A series of novel nano-rubber particles (UFPR) were introduced,which were prepared through irradiating common rubber lattices and spray drying them. Epoxies toughened with UFPRshowed a much better toughening effect than those with CTBN, and the heat resistance of epoxy was unexpectedly elevated.For polypropylene toughening, UFPR can improve the toughness, stiffness and heat resistance of PP simultaneously. Thesespecial toughening effects overcome the deficiencies in rubber toughening technology and are worth further investigating.展开更多
文摘A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolic resin.The reaction between NBENP and resol was measured by FT-IR,and the curing behavior of resins was charactered by DSC.The mecanical and thermal properties of modified resins were measured.Fra cture surface of modified phenolic resin was observed by SEM.The results showed that,the impact strength, flexural strength and heat resistance of NBENP modifie d phenolic resin were increased at the same time. A strong interface adhesion wa s formed because of the reaction between hydroxymethyl of resol and NBENP.This s pecial interface conduces to transmission of stress when materials were loaded,a nd inhibition of deformation and decomposition of phenolic matrix when heated.Th e microcrack,initiated with rubber particle,and cavitation of rubbers might be t he main reason for increase in toughness.The honeycomb structure in fracture sur face might be another possible reason for excellent mechanical properties.
基金This work was financially supported by the Special Funds for Major State Basic Research Projects of China (No. G1999064800).
文摘According to the present theories of plastic toughening, it is impossible to enhance the toughness, stiffness and/orheat resistance of plastics simultaneously by using rubber. A series of novel nano-rubber particles (UFPR) were introduced,which were prepared through irradiating common rubber lattices and spray drying them. Epoxies toughened with UFPRshowed a much better toughening effect than those with CTBN, and the heat resistance of epoxy was unexpectedly elevated.For polypropylene toughening, UFPR can improve the toughness, stiffness and heat resistance of PP simultaneously. Thesespecial toughening effects overcome the deficiencies in rubber toughening technology and are worth further investigating.
