Abstract:

In order to study the moisture absorption and liberation properties of rice-straw fiber,the morphological structure of rice-straw fiber was characterized by scanning electron mircroscope,the absorption and liberation properties of rice-straw fiber,flax fiber and cotton fiber were tested in the standard normal atmospheric conditions.The moisture absorption and desorption properties of rice-straw fiber were tested.Their regression curves of moisture absorption and liberation were drawed,and based on it,the regression equations of moisture absorption and desorption velocity were derived.The hygroscopity of rice-straw fiber was analyzed and compared with flax fiber and cotton fiber. The results show that,the lengthwise of the rice-straw fiber has a large number of grooves and it’s specific surface area is large.The moisture absorption and liberation of rice-straw fiber are very good.The moisture absorption and liberation regain rate of rice-straw fiber are 9.3% and 10.35% respectively.The moisture absorption and liberation rate of three fibers decay with exponential curve.The moisture absorption and liberation rate of flax fiber is the quickest,rice-straw fiber in the second,and cotton fiber is the slowest.

Key words: rice-straw fiber, morphological structure, hygroscopicity, absorption and liberation rate