Influence of Calotropis gigantea’s Performance Dealing with Waterborne Polyurethane
Abstract: To improve Calotropis gigantea’s strength per size and elastic modulus, Calotropis gigantea was treated by 10%, 20% and 30% waterborne polyurethane. There were great changes in strength per unit and elastic modulus of Calotropis gigantea, but the breaking extension ratio was nearly the same when dealt with different concentrations of waterborne polyurethane. The average of strength per size disposed with 20% concentration was the highest and its average value was 3.39 cN/dtex. According to the testing results of SEM and contact angle, hydrophobic layer in the surface of Calotroipis gigantea was destroyed and its hydrophilic property was improved after pretreatment. There was a layer of membrane covering the surface of fiber when dealt with waterborne polyurethane.
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