Influence of NCO/OH and transesterified castor oil on the structure and properties of polyurethane: Synthesis and characterization
A series of polyurethane (MBPUs) with varying stoichiometric balance i.e., isocyanate (NCO): hydroxyl groups (OH) ratio (viz. 1:1, 1.2:1 and 1.4:1), was synthesized using transesterified castor oil and partially biobased isocyanate. The chemical properties, kinetics, thermal stability, morphology and mechanical properties of the MBPUs were analyzed systematically. FTIR results confirmed the synthesis of MBPUs and the increase in hydrogen bonding with the increase in NCO/OH molar ratio. A three step degradation mechanism for MBPU films was observed through TGA analysis. The DSC study revealed that the glass transition temperature (Tg ) increases with increase in NCO/OH molar ratio. Broad scattering halos observed from WAXD pattern of MBPU films revealed its amorphous nature. The phase separated surface morphology of MBPUs was noticed in SEM and AFM images. Flory Rehner Equation was used for determining the molecular weight between crosslinks and degree of crosslinking. From the mechanical analysis, it was inferred that the NCO/OH molar ratio had a profound effect on the tensile properties and modulus.
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Document Type: Research Article
Publication date: October 1, 2015
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