Abstract
ABSTRACTThe physical properties of novel thermoplastic random copolyesters [‐(CH2)n‐COO‐/‐(CH2)n‐COO‐]x made of long (n = 12) and medium (n = 8) chain length ω‐hydroxyfatty esters [HO‐(CH2)n‐COOCH3] derived from bio‐based vegetable oil feedstock are described. Poly(ω‐hydroxy tridecanoate/ω‐hydroxy nonanoate) P(−Me13−/−Me9−) random copolyesters (Mn = 11,000–18,500 g/mol) with varying molar ratios were examined by TGA, DSC, DMA and tensile analysis, and WAXD. For the whole range of P(−Me13−/−Me9−) compositions, the WAXD data indicated an orthorhombic polyethylene‐like crystal packing. Their melting characteristics, determined by DSC, varied with composition suggesting an isomorphic cocrystallization behavior. TGA of the P(−Me13−/−Me9−)s indicated improved thermal stability determined by their molar compositions. The glass transition temperature, investigated by DMA, was also found to vary with composition. The crystallinities of P(−Me13−/−Me9−)s however, were unaffected by the composition. The stiffness (Young's modulus) of these materials was found to be related to their degrees of crystallinity. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40492.
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