Microwave‐assisted green approach for graft copolymerization of l‐lactic acid onto starch. Issue 6 (15th October 2015)

• Record Type: Journal Article
• Authors: Salimi, Kouroush; Topuzogullari, Murat; Dincer, Sevil; Aydin, Halil Murat; Piskin, Erhan
• Is Part Of: Journal of applied polymer science. Volume 133:Issue 6(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-10-15
• Subjects: graft copolymerization -- lactic acid -- microwave heating -- starch; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.42937
• Languages: English
• ISSNs: 0021-8995

Abstract

ABSTRACT: Polyl ‐lactic acid grafted starch (St‐ g ‐PLA) copolymers were directly synthesized under microwave irradiation by using sodium hydroxide (NaOH) and stannous 2‐ethyl hexanoate acting as a catalyst, without the use of toxic solvents. The product were characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance ( 13 C CP/MAS NMR), X‐ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA‐DTG). SEM analysis indicated that microwave heating had a considerable effect on the interfacial adhesion between PLA and starch. Thermogravimetric analysis (TGA‐DTG) revealed that copolymers exhibited better thermal stability. Maximum PLA grafting was achieved with the following reaction conditions: 450W microwave power, monomer ratio of 1:5 and 0.4 M of NaOH. This study demonstrates that it is possible to obtain St‐ g ‐PLA copolymers with better processing characteristics and smaller sizes via microwave‐assisted synthesis. The applied procedure is an interesting "green" synthesis method for the production of biodegradable materials used in a diverse range of applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2016, 133, 42937. Abstract :