The structural features and fracture morphology of raw and chemically treated pineapple leaf fiber have been studied using scanning electron microscopy. Pineapple leaf has a multicellular structure, and alkali treatment clearly reveals the ultimate fibers. Surface morphology progressively changes with gradual removal of noncehulosic constituents like lignin and hemicellulose. Fracture morphology shows that there is a uniform sharing of the load in the ultimate fibers of raw pineapple leaf, whereas treated leaf shows irregular fractures characterized by the slippage of individual ultimate fibers.
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