超低温处理对棉纤维性能的影响

Influence of Ultralow Temperature Treatment on Cotton Fiber Property

探讨超低温处理对棉纤维性能的影响。利用液氮超低温对棉纤维进行处理,测试了超低温处理前后棉纤维的分子结构、热学性能及强伸性能。研究表明:液氮超低温处理并未改变棉纤维纤维素Ⅰ的晶型结构,但棉纤维的结晶度、晶粒尺寸、热学性能、断裂比强度随着处理时间的增加均有不同的下降,而断裂伸长率随处理时间的增加而不断增大,且热重损失速率最大值区间在300℃~360℃,而断裂比强度与断裂伸长率变化速率最大值的区间均在0h^1h。认为:超低温处理会造成棉纤维热学性能和强伸性能的下降。

Influence of ultralow temperature treatment on cotton fiber properties was discussed. Liquid nitrogen under ultralow was adopted for the treatment of cotton fiber. Molecule structure, thermal property and breaking ＆ elongation properties of cotton fiber before and after ultralow temperature treatment were tested. The test results show that cellulose I crystal structure of cotton fiber after the treatment with liquid nitrogen under ultralow temperature is not changed. However, the crystallinity degree, grain size, thermal property and breaking specific strength of cotton fiber are all decreased in different extents as the increase of treating time while the breaking elongation is enlarged as the increasing of trea：ting time. The range of maximum thermogravimetric loss rate is 300 ℃-360 ℃. The range of maximum breaking specific strength and breaking elongation changing rate is 0 h- 1 h. It is considered that cotton fiber thermal property and breaking ＆ elongation were reduced after treatment of ultralow temperature.