Flexible starch-polyurethane films: Effect of mixed macrodiol polyurethane ionomers on physicochemical characteristics and hydrophobicity

Tai, N, Adhikari, R, Shanks, R, Halley, P and Adhikari, B 2018, 'Flexible starch-polyurethane films: Effect of mixed macrodiol polyurethane ionomers on physicochemical characteristics and hydrophobicity', Carbohydrate Polymers, vol. 197, pp. 312-325.


Document type: Journal Article
Collection: Journal Articles

Title Flexible starch-polyurethane films: Effect of mixed macrodiol polyurethane ionomers on physicochemical characteristics and hydrophobicity
Author(s) Tai, N
Adhikari, R
Shanks, R
Halley, P
Adhikari, B
Year 2018
Journal name Carbohydrate Polymers
Volume number 197
Start page 312
End page 325
Total pages 14
Publisher Pergamon Press
Abstract One of the most critical limitations in synthesizing starch-polyurethane (PU) hybrid materials is their microphase separation caused by physical incompatibility. This paper reports that the physical incompatibility and microphase separation between starch and PU can be overcome by using specifically designed anionic poly(ether-ester) polyurethane (AEEPU). The AEEPU was synthesised by preparing isocyanate (NCO)-terminated prepolymer using Isophorone diisocyanate (IPDI), 2,2-bis(hydroxymethyl)propionic acid (BMPA), poly (ethylene glycol) (PEG) and polycaprolactone (PCL). This AEEPU was physically mixed with glycerol plasticized high amylose starch (HAGS) at HAGS to AEEPU mass ratios of 90/10, 80/20, 70/30, 60/40, 50/50. Higher AEEPU content in HAGS-AEEPU increased surface hydrophobicity and elasticity while the Young's modulus remained unaffected. HAGS-AEEPU film at 50:50 ratio was comparable to LDPE film in terms of elongation at break (187%), Young's modulus (383 MPa), and contact angle (112°) and good transparency. These starch-PU films are expected to find increased application as biodegradable packaging materials.
Subject Macromolecular and Materials Chemistry not elsewhere classified
Keyword(s) Anionic polyurethane
Flexibility
High amylose starch
Hydrogen bonding
Hydrophobicity
Packaging films
Strength
DOI - identifier 10.1016/j.carbpol.2018.06.019
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0144-8617
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