Molecular weight dependence of tensile properties of ramie and linen fibers

This study examines the dependence of ramie and linen tensile properties on the molecular weight of cellulose as a function of moisture absorption. Th e influence of the crystalline region and molecular weight on tensile prope rties is investigated using mercerized and acid hydrolyzed cotton fibers. N o influence of the crystalline region on ramie and linen tensile properties is detected, and the effects of moisture regain on the tensile strength an d elongation of ramie and linen fibers decrease with decreasing molecular w eight. The slope in the plot of tensile properties versus moisture regain b ecomes negative when the molecular weights of ramie and linen are below abo ut 1.22 X 10(5) and 0.99 X 10(5), respectively. Changes in tensile strength and elongation with moisture absorption depend mainly on the number of mol ecular chain ends in the amorphous region.