A sustainable approach to produce stiff, super-tough, and heat-resistant poly(lactic acid)-based green materials

Oğuz, Oğuzhan and Candau, Nicolas and Çıtak, Mehmet Kerem and Çetin, Fatma Nalan and Seven, Merve Senem and Menceloğlu, Yusuf Z. (2019) A sustainable approach to produce stiff, super-tough, and heat-resistant poly(lactic acid)-based green materials. ACS Sustainable Chemistry and Engineering, 7 (8). pp. 7869-7877. ISSN 2168-0485

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Abstract

Circumventing inherent embrittlement, poor heat resistance, and melt elasticity of poly(lactic acid) (PLA) without compromising its remarkable stiffness and strength has become a particular challenge in polymer science due to increasing demand for green materials in emerging applications of sustainable chemistry and engineering. Achieving this without using any high-cost reagent/additive and/or complex processing technique is another critical aspect for developing industrially viable alternatives to petroleum-based commodity plastics. Here we demonstrate that high-shear mixing of PLA with waste cross-linked polyurethanes and waste cellulose fibers allows for overcoming its inherent embrittlement, poor heat resistance, and melt elasticity without compromising its superior stiffness and strength while suggesting a sustainable way of recycling/reusing industrial wastes as high added-value additives. We therefore achieve to produce stiff, strong, super-tough, and heat-resistant PLA-based green materials, for instance, with an elastic modulus of 4 GPa at 25 °C (∼30% higher than that of pure PLA), a storage modulus of 312 MPa at 90 °C (∼44 times higher than that of pure PLA), a tensile strength of 65 MPa (comparable to that of PLA), and an impact strength (toughness) of 52 kJ/m2 (∼2.3 times higher than that of pure PLA).
Item Type: Article
Uncontrolled Keywords: High-shear mixing; PLA; Waste cross-linked polyurethane; Waste cellulose fiber; Recycling
Divisions: Integrated Manufacturing Technologies Research and Application Center
Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Merve Senem Seven
Date Deposited: 26 Aug 2019 22:47
Last Modified: 26 Apr 2022 10:04
URI: https://research.sabanciuniv.edu/id/eprint/37225

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