Morphology & Properties of Blends of Starch –caprolactone Blend
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چکیده
A binary blend of polycaprolactone and starch in 70:30 weight ratio (known under the tradename “Envar”) was blended in various weight ratios with organosolv lignin (L) and organosolv lignin butyrate (LB) by solvent casting and melt blending. The thermal transitions observed by DSC revealed behavior resembling that of native polycaprolactone (PCL). Depression in melting temperatures obtained by DSC revealed interaction between SCL and L or LB. Also dynamic mechanical measurements indicated some measure of polymer-polymer interaction by revealing shifts in the glass and melting transitions of PCL. Crystallinity in PCL was found to increase probably due to nucleation initiated by the lignin particles. An increased degree of crystallinity was observed in the case of higher-Tg lignin compared to lower Tg lignin butyrate. Modulus and tensile properties increased up to about 20 % incorporation of lignin components. Chapter V: Morphology & properties of starch-caprolactone blend system 119
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