4 . foams immersed in ethanol for 2 . 5 and 17 . 5 hours , mass loss happened but notable in the one with lower porosity . volume shrink happened from 7 . 5th hour and decreased to 70 - 75 % at 25th hour respectively and significantly ( p < 0 . 05 ) 持续酒精消毒5小时之后支架体积逐渐缩减，至第25小时体积缩减为原来的70 75 ，具有统计学意义；其中高空隙率支架体积变化更明显（ p 0
