Influence of residual lignin content on the thermal and morphological behavior of polypropylene-kraft pulp composite

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The effect of effective alkali on the mechanical strength properties and water absorption of kraft pulp/polypropylene composite was studied. Hornbeam wood (Carpinus betulus) chips converted to Kraft pulping in different effective alkali (15, 20 and 25%) and fixed levels of cooking time (120 min), temperature 170 °C and sulfidity 25%. Then residual lignin content of these pulping was determined according to the TAPPI standard. Kraft pulping flour/polypropylene (PP)/ maleic anhydride (MAPP) was considered to be constant at 50%, 50% and 4 Phc for made of composite. Thermal behavior of samples was studied by differential scanning calorimetry and thermogravimetric analysis. Morphological experimental were examined by SEM. Results indicated that with increasing of effective alkali (from 15 to 25%), the values of loss weight, crystalinityenthalpy and crystalinity surface were increased and melting temperature were decreased. Results of scanning electron microscope indicated that the quality of jointed surface was decreased by increasing of effective alkali and decreasing of residual lignin.

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