The Interactions of benzene

1

2-diehloroethane

acetone

ethanol and ethyl acetate with hydroxyl terminated poly(butadiene/acrylonitrile) based polyurethane (HTBN-PU) and their transports in HTBN-PU were studied by quartz spring method．DSC and FTIR measurements．The non-fickian behavior was found for diffusion of all five solvents in HTBN-PU．Higher solvent vapor pressure led to more obvious non-fickian diffusion．In addition．higher degree of non-fickian diffusion was found for diffusion of 1

2-diehioroethane and ethyl acetate in HTBN-PU

which could be mainly attributed to their polar tems and hydrogen-bending terms of solubility parameters being closer to those of the soft matrix．The benzene and 1

2-dichloroethane had higher solubilities in HTBN-PU than the other three solvents

which could be mainly related to their dispersive terms of solubility parameters being closer to that of the soft matrix．The Florv-Huggins type sorption was found for all the five solvents in HTBN-PU.FTIR results showed that the degree of hydrogen bonding between the urethane groups decreased after slovent uptaking The strength of HTBN-PU after solvent uptaking was mainly determined by the interaction of solvent molecules with the urethane groups．Acetone

ethanol and ethyl acetate could form hydrogen bonds with the urethane groups and therefore msnlts in serious structure destruction and lower strength of HTBN-PU．while the non-polar benzene only slightly influenced its strength．