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Stereocomplexation and mechanical properties of polylactide-b-poly(propylene glycol)-b-polylactide blend films: Effects of polylactide block length and blend ratio

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Abstract

In the present work, poly(propylene glycol) (PPG) was block copolymerized to form polylactide-poly(propylene glycol)-polylactide (PL-PPG-PL) triblock copolymers for preparing flexible stereocomplex PL (scPL) blend films. The scPL blend films were prepared by solution blending of poly(L-lactide)-PPG-poly(L-lactide) (PLL-PPG-PLL) and poly(D-lactide)- PPG-poly(D-lactide) (PDL-PPG-PDL) triblock copolymers before film casting. The influences of PL end-block lengths (2 × 104 and 4 × 104 g/mol) and blend ratios (75/25, 50/50 and 25/75 W/W) on the stereocomplexation and mechanical properties of the blend films were evaluated. From DSC and WAXD results, the 50/50 blend films had complete stereocomplexation. Phase separation between the scPL and PPG phases was not observed from their SEM images. The tensile stress and elongation at break increased with the sterecomplex crystallinities and PL end-block lengths. The PPG middle-blocks enhanced elongation at break of the scPL films. The results showed that the PL-PPG-PL triblock structures did not affect stereocomplexation of the PLL/PDL block blending. In conclusion, the phase compatibility and flexibility of the scPL films were improved by PPG block copolymerization.

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Acknowledgments

The Center of Excellence for Innovation in Chemistry (PERCH-CIC), Office of the Higher Education Commission, Ministry of Education, Thailand are acknowledged. The authors are very grateful to Dr. Jolyon Dodgson, Department of Biology, Faculty of Science, Mahasarakham University for his improvement of the English language in this manuscript.

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Authors and Affiliations

  1. Biodegradable Polymers Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham, 44150, Thailand

    Dutchanee Pholharn, Onanong Cheerarot & Yodthong Baimark

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  1. Dutchanee Pholharn
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  2. Onanong Cheerarot
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  3. Yodthong Baimark
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Corresponding author

Correspondence to Yodthong Baimark.

Additional information

This work was financially supported by the Academic Development Fund of Rajabhat Maha Sarakham University (PhD scholarship for D. Pholharn) and the Division of Research Facilitation and Dissemination, Mahasarakham University (2017).

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Pholharn, D., Cheerarot, O. & Baimark, Y. Stereocomplexation and mechanical properties of polylactide-b-poly(propylene glycol)-b-polylactide blend films: Effects of polylactide block length and blend ratio. Chin J Polym Sci 35, 1391–1401 (2017). https://doi.org/10.1007/s10118-017-1989-3

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  • DOI: https://doi.org/10.1007/s10118-017-1989-3

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