Journal
POLYMER TESTING
Volume 62, Issue -, Pages 1-12Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2017.06.013
Keywords
Thermoplastic polyurethane; Poly(L-lactide); Stereocomplex crystallites; Morphology; Crystallization
Funding
- State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2017-4-05]
- Fundamental Research Funds for the Central Universities [XDJK20178018, XDJK2017D051]
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Melt-blending poly(L-lactide) (PLLA) with elastomers has been well demonstrated to improve toughness of PLLA. Here, we show a poly(D-lactide) (PDLA) grafted thermoplastic polyurethane (TPU) (TPU-g-PDLA) toughed PLLA with simultaneous formation of few amount stereocomplex crystallites (SCs) which exhibited higher efficient toughening than that of PLLA with TPU. The TPU-g-PDLA was prepared by the in-situ melt-reaction of TPU and PDLA with 4, 4'-diphenylmethane diisocyanate (MDI). A comparative study on morphology, rheological and crystallization behavior was also carried in PLLA/TPU, PLLA/TPU-g-PDLA and PLLA/TPU/PDLA samples. The PLLA/TPU-g-PDLA samples show the highest crystallization rate, complex viscosity, impact strength and tensile strength among PLLA/TPU, PLLA/TPU-g-PDLA and PLLA/TPU/PDLA samples, indicating that the higher interfacial interaction between TPU-g-PDLA and PLLA. Furthermore, TPU chains in TPU-g-PDLA were thought to break the intermolecular interaction of PLLA and rapid its crystallization and increase crystallinity. (C) 2017 Elsevier Ltd. All rights reserved.
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