A systematic study was undertaken in supercritical carbon dioxide to absorb thymol,benzyl carbinol and alcohol into polyurethane by a simple gravimetric method.The uptake of small molecule in PU had been observed with the changes of the factors such as temperature,pressure of supercritical carbon dioxide,absorption time and dimension of PU.Moreover,the mass change of PU after treatment was observed and the impregnation mechanism of small molecule was discussed to explain the experimental results.%研究了超临界CO2中聚氨酯对乙醇、麝香草酚和β苯乙醇等小分子的吸附作用，观测了超临界CO2的温度、压力、吸附时间和聚氨酯厚度对小分子吸附量的影响以及小分子在聚氨酯中的释放规律，并探讨了小分子的渗透机理.
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