3 years ago

Hybrid SC-polylactide/poly(silsesquioxane) blends of improved thermal stability

Hybrid SC-polylactide/poly(silsesquioxane) blends of improved thermal stability
Agata S. Herc, Piotr Lewiński, Sławomir Kaźmierski, Joanna Bojda, Anna Kowalewska

Hybrid blends of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) and hydrogen bonds donating/accepting oligomeric ladder silsesquioxanes (LPSQ-R; R = OH, (OH)2, COOH, COOMe) exhibited higher thermal stability at T > 533 K. Temperature of decomposition (Td) increased by 20 – 30 K comparing to neat PLLA/PDLA, even when small amounts of the additives were used. Stereocomplexation in PLLA/PDLA blends was improved with the addition of H-bond donating LPSQ-R, even in the presence of substantial amounts of the additives, and only slightly disturbed by LPSQ-COOMe. Vibrational spectroscopic analysis was used to follow the crystal structure evolution at 448 K. The modes characteristic of 31 β-helical structures were observed in the studied samples. LPSQ-R grafted with thioglycerol moieties, significantly increased the stereocomplexation rate. Nuclear magnetic resonance spectroscopy (NMR) and wide-angle X-ray scattering (WAXS) measurements confirmed the stereocomplex structure of the hybrid blends. All the observed effects may be related to the specific structure of polysilsesquioxanes and R groups.

Publisher URL: https://www.sciencedirect.com/science/article/pii/S0040603119311852

DOI: 10.1016/j.tca.2020.178592

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