Abstract

Supasin Pasee, Onanong Cheerarot and Yodthong Baimark*

DOI : http://dx.doi.org/10.13005/ojc/310333

The stereocomplex polylactide (scPLA) films of star-shaped poly(L-lactide) (PLLA)/linear poly(D-lactide) (1PDLA) blends were prepared by solution blending before film casting. The influences of the PLLA/1PDLA blend ratios (75/25, 50/50 and 25/75 w/w), 1PDLA molecular weights (30,000 and 60,000 g/mol) and PLLA arm numbers (1-, 4- and 16-arm) on the crystallinity and mechanical properties of the scPLA films were investigated. The stereocomplex crystallinity (c_sc), stress at break and elongation at break of the scPLA films were the highest in the 50/50 (w/w) blend ratio. The c_sc of the scPLA films decreased and the mechanical properties slightly increased as the 1PDLA molecular weight increased. For the same blend ratio and 1PDLA molecular weight, the scPLA films prepared from the 16PLLA blending had the highest c_sc values.

Bioplastics; Stereocomplex polylactides; Star-shaped polymers; Thermal properties; Mechanical properties

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