Cotton Science 2005，17(2)：112-116
Super-molecular Structure and Its Relation to Quality Parameters in Abstract：During the process of fiber development, crystalline grain size and crystallinity increase continually with fiber development. Orientational separate angle-α gradually augments(widens), orientational distribution angle-ψ and spiral angle-φ gradually reduce(optimize) with fiber development. There are less differences in crystalline grain size and crystallinity of mature cotton fiber between different cotton species and varieties of cotton. And they have not significant correlation with fiber strength. But the orientational parameter has contrary results. There are different supermolecular structures in cotton fiber at the different anthesis date. However, the increasing trend of crystalline grain size and crystallinity is not influenced significantly and neither do orientational distribution angle-ψ and spiral angle-φ. Super-molecular structure has close relation with quality parameters, especially fiber strength. Increasing of crystalline grain size and crystallinity has significant influence to the developing fiber, but has not such influence to mature fiber because the sediment of cellulose has finished. Orientational parameter has significant influence to fiber strength. The less the orientational separate angle-α and spiral angle-φ, the higher the orientation degree, the higher the fiber strength, the better the fiber quality. In the future, we should breed cotton varieties of high quality combining super-molecular structures. In agricultural production proper sowing date should be chosen in order to improve fiber quality by promote crystallinity and crystalline grain size and optimize orientational parameters.
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