摘要
A kind of organically modified montmorillonite (OMMT) treated by cetryltrimethyl ammonium bromide (CTAB) was grafted with 4,4′-diphenylmethane diisocyanate (MDI) by it’s hydroxyl group (—OH) acted with isocyanate group (—NCO).This MDI modified montmorillonite was abbreviated as MOMMT.Thenceforth,the MOMMT was applied to prepare polyurethane (PU)/MOMMT nanocomposites based on poly(propylene glycol),1,4-butanediol and MDI via solution intercalation technology.Compared with OMMT,the interlayer spacing of MOMMT was enlarged from 2.07 nm to 2.39 nm.PU chains intervened the galleries between MOMMT layers during solution intercalation,and an intercalated PU/MOMMT nanocomposite was obtained.The tensile strength and tear strength of PU/MOMMT nanocomposites were higher than those of PU/OMMT nanocomposites.Thermal stability of PU/MOMMT nanocomposites was lower than that of the PU/MMT composite because of the degradation of CTAB and MDI in the first step of thermodegradation,whereas in the second step they exhibited higher thermal stability due to the high barrier effect of the silicate layers dispersed on the nanometer scale and strong interface interaction between the silicate layers and the PU chains.
A kind of organically modified montmorillonite （OMMT） treated by cetryltrimethyl ammonium bromide （CTAB） was grafted with 4,4＇-diphenylmethane diisocyanate （MDI） by it＇s hydroxyl group （--OH） acted with isocyanate group （--NCO）. This MDI modified montmorillonite was abbreviated as MOMMT. Thenceforth, the MOMMT was applied to prepare polyurethane （PU）/MOMMT nanocomposites based on poly（propylene glycol）, 1,4- butanediol and MDI via solution intercalation technology. Compared with OMMT, the interlayer spacing of MOMMT was enlarged from 2.07 nm to 2.39 nm. PU chains intervened the galleries between MOMMT layers during solution intercalation, and an intercalated PU/MOMMT nanocomposite was obtained. The tensile strength and tear strength of PU/MOMMT nanocomposites were higher than those of PU/OMMT nanocomposites. Thermal stability of PU/MOMMT nanocomposites was lower than that of the PU/MMT composite because of the degradation of CTAB and MDI in the first step of thermodegradation, whereas in the second step they exhibited higher thermal stability due to the high barrier effect of the silicate layers dispersed on the nanometer scale and strong interface interaction between the silicate layers and the PU chains.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第5期796-800,共5页
Acta Polymerica Sinica
基金
江苏高校高新技术资助项目(项目号JH02071)
南京大学大型仪器开放测试基金资助项目(基金号0205001324)
