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Issue 50, 2018, Issue in Progress
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Effect of stereocomplex crystal and flexible segments on the crystallization and tensile behavior of poly(l-lactide)

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Abstract

The effects of poly(ethylene glycol) (PEG) and/or poly(D-lactide) (PDLA) blocks on the crystallization and mechanical properties of poly(L-lactide) (PLLA) were investigated systematically via differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide-angle X-ray diffraction (WAXD) and tensile testing. The structural evolution during uniaxial stretching of the obtained blends above the glass transition temperature was studied by in situ WAXD. It was observed that the stereocomplex (SC) crystals promoted the nucleation of PLLA homocrystals (α/α′ crystal), and flexible PEG blocks could enhance the spherulitic growth rate. The PLLA/PDLA–PEG–PDLA had a higher elongation at break than that of PLLA/PDLA without significant loss in tensile strength and stiffness. In situ WAXD showed that the PLLA/PDLA–PEG–PDLA crystallized faster during stretching. It was shown that the incorporation of SC crystals and flexible PEG blocks could not only accelerate the crystallization but also improve the toughness of PLLA.

Graphical abstract: Effect of stereocomplex crystal and flexible segments on the crystallization and tensile behavior of poly(l-lactide)

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Publication details

The article was received on 22 Jun 2018, accepted on 30 Jul 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8RA05355C
RSC Adv., 2018,8, 28453-28460
  • Open access: Creative Commons BY license
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    Effect of stereocomplex crystal and flexible segments on the crystallization and tensile behavior of poly(L-lactide)

    X. Li, X. Zhang, G. Liu, Z. Yang, B. Yang, Y. Qi, R. Wang and D. Wang, RSC Adv., 2018, 8, 28453
    DOI: 10.1039/C8RA05355C

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