Poly(propylene glycol)-b-Polylactide 블렌드 필름의 Stereocomplexation과 기계적 물성에 미치는 Poly(propylene glycol)의 블록 구조와 길이의 영향

Yodthong Baimark; Yaowalak Srisuwan

Polymer(Korea), Vol.42, No.3, 385-393, May, 2018

DOI10.7317/pk.2018.42.3.385 Export Citation

Poly(propylene glycol)-b-Polylactide 블렌드 필름의 Stereocomplexation과 기계적 물성에 미치는 Poly(propylene glycol)의 블록 구조와 길이의 영향

Effects of Block Structure and Poly(propylene glycol) Block Length on Stereocomplexation and Mechanical Properties of Poly(propylene glycol)-b-Polylactide Blend Films

Yodthong Baimark^†, and Yaowalak Srisuwan

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

E-mail:

Stereocomplex polylactide (scPL) shows better mechanical properties than both poly(L-lactide) (PLL) and poly(D-lactide) (PDL). However, scPL is still brittle. In this work, di- and triblock copolymers of poly(propylene glycol) (PPG) and polylactide (PLL or PDL) were synthesized for the preparation of scPL films. The influences of the block structure, PPG block length and blend ratio on stereocomplexation, film morphology and mechanical properties of the scPL films were investigated. From DSC and WAXD results, the 50/50 wt% blend films exhibited the highest stereocomplexation. Phase separation between the scPL and PPG phases was not found from their SEM images. The tensile stress and elongation at break of the blend films increased with the sterecomplex crystallinities. The longer PPG blocks improved both the stereocomplexation and elongation at break of the blend films. In conclusion, the block structures and PPG block lengths influenced on both the stereocomplexation and mechanical properties of the scPL films.

Keywords:stereocomplex;polylactide;poly(propylene glycol);block copolymers;mechanical properties

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[3] Rogovina SZ, Aleksanyan KV, Kosarev AA, Ivanushkina NE, Prut EV, Berlin AA, Polym. Sci. Ser. B, 58, 38 (2016)

[4] Kulinski Z, Piorkowska E, Gadzinowska K, Stasiak M, Biomacromolecules, 7(7), 2128 (2006)

[5] Piorkowska E, Kulinski Z, Galeski A, Masirek R, Polymer, 47(20), 7178 (2006)

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[8] Tacha S, Saelee T, Khotasen W, Punyodom W, Molloy R, Worajittiphon P, Meepowpan P, Manokruang K, Eur. Polym. J., 69, 308 (2015)

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[22] Bibi G, Jung Y, Lim JC, Kim SH, Polym. Korea, 39(3), 453 (2015)