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- W2351223708 abstract "Polyurethane membranes based on toluene diisocyanate (TDI),1,4-butanediol (BDO) and hydroxyl terminated polybutadiene/styrene (HTBS) or hydroxyl terminated polybutadiene/acrylonitrile (HTBN) and hydroxyl-terminated polybutadiene (HTPB) were synthesized by solution polymerization.The morphologies of these samples were characterized by DSC,FTIR and AFM measurements.DSC results showed that the T g of the soft segments for HTPB and HTBS were about only 3～6℃ higher than that of their pure soft segments.This indicated that the HTPB and HTBS based PU were well phase separated.The T g of soft segments for HTBN,however,were about 11～15℃ higher than that of the pure soft segment,which revealed a lower microphase separation degree of HTBN based PU.This might be attributed to that the —CN groups in the soft segment could create hydrogen bonding with —NH groups in hard segment as proton receiver leading to partly mixing of soft and hard segment.Results of infrared analysis revealed that about 90 percent of urethane CO groups formed hydrogen bonds between hard segments for both HTPB and HTBS based PU and about 84 percent for HTBN based PU.AFM results showed that the coarseness degree increased with increasing the hard segments content in HTBN based PU.HTBN and HTPB based PU showed two continuous phases when hard segment content reached 63%,whereas hard segments formed the only continuous phase in HTBS with the same hard segment content.The mechanical properties showed that the strength of HTBS and HTBN based PU were about 1.5 and 2 times higher than that of HTPB based PU respectively.The modulus and elongation of HTBN and HTBS based PU was also higher than that of HTPB based PU." @default.
- W2351223708 created "2016-06-24" @default.
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- W2351223708 date "2002-01-01" @default.
- W2351223708 modified "2023-09-25" @default.
- W2351223708 title "MORPHOLOGY AND PROPERTIES OF POLYBUTADIENE/STYRENE, POLYBUTADIENE/ACRYLONITRILE BASED POLYURETHANE" @default.
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