Packaging Film of PP/LDPE/PLA/Clay Composite: Physical, Barrier and Degradable Properties
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ORIGINAL PAPER
Packaging Film of PP/LDPE/PLA/Clay Composite: Physical, Barrier and Degradable Properties Supornpat Mooninta1 · Sirilux Poompradub2,3,4 · Pattarapan Prasassarakich2,3,4
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This work sought to improve the properties of polypropylene (PP) for single layer film application by incorporating low density polyethylene (LDPE), poly(lactic acid) (PLA) and montmorillonite (MMT). The addition of LDPE in PP improved the elongation at break and tear strength. The PP/LDPE blend at a 80:20 (w/w) ratio was selected for blending with PLA and MMT and the PP/LDPE/PLA/MMT composite showed an increased tensile modulus, while the elongation at break decreased, with increasing PLA and MMT contents. The morphological structure of the respective nanocomposites was examined using X-ray diffraction, transmission electron microscopy and scanning electron microscopy analyses. For the barrier properties, the incorporation of PLA and MMT in PP/LDPE blend tended to dramatically decrease the oxygen permeability but slightly increase the water vapor permeability. Moreover, the PP/LDPE/PLA/MMT composite as a new effective film decreased the tomato loss weight during low temperature storage (15–20 °C) compared to the PP film. Keywords Particle-reinforcement · Polymer–matrix composites · Physical properties · Extrusion · Barrier film
Introduction Barrier films in the packaging industry are produced via multilayer co-extrusion, extrusion coating and adhesive lamination processes. The technologies are complex and expensive and the final products are not recyclable or biodegradable. Polymer blending is a simple technique to enhance the properties of a pure polymer for use in a single layer barrier Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10924-020-01840-6) contains supplementary material, which is available to authorized users. * Pattarapan Prasassarakich [email protected] 1
Program in Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand
2
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand
3
Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 10330 Bangkok, Thailand
4
Green Materials for Industry Application Research Unit, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand
film [1]. The blends of commodity polymers and barrier compounds are alternatives to improve the barrier properties and lead to a low-cost product. Polypropylene (PP) is a commodity polymer with suitable mechanical properties, transparency, satisfactory heat resistance and a good barrier to moisture, but its low flexibility and poor barrier to oxygen limit its applications [2]. Lowdensity polyethylene (LDPE) is widely used as an important packaging material due to its excellent properties, such as a high flexibility, impact resistance and chemical resi
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