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Journal of Applied Sciences
Year: 2012  |  Volume: 12  |  Issue: 13  |  Page No.: 1364 - 1370

Biodegradable Linear/Star-shaped Poly(L-lactide) Blends Prepared by Single Step Ring-opening Polymerization

Yodthong Baimark and Yaowalak Srisuwan    

Abstract: Poly(L-lactide) (PLL) is an environmentally friendly polymer that has widely been used in medical and packaging applications because of its biodegradability and biocompatibility. Star-shaped PLLs are expected to exhibit different properties compared to the linear PLL. The objective of this study was to investigate the effects of blend ratios and blending techniques including single step ring-opening polymerization and solution blending on the characteristics of linear (1-arm)/star-shaped (6-arm) PLL blends. A 1-dodecanol/ dipentaerythritol mixture and stannous octoate were used as an initiating system. Intrinsic viscosity, glass transition temperature and crystallizing temperature of the PLL blends steadily increased, while heat of crystallization and heat of melting significantly decreased when the star-shaped blend ratio was increased. However, melting temperature and thermal decomposition did not change. Mechanical properties of the PLL films were also influenced by the blend ratio. The physical and mechanical properties of the PLL blends obtained from single step polymerization depend upon the blend ratio, similar as when they are obtained from the solution blending method.

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