Thermoplastic starch blown films with improved mechanical and barrier properties

2021 ◽  
Author(s):  
Khanh Minh Dang ◽  
Rangrong Yoksan
Keyword(s):  
Barrier Properties ◽  
Thermoplastic Starch ◽  
Blown Films

scholarly journals Environmentally Friendly Packaging Materials Based on Thermoplastic Starch

2019 ◽  
Vol 33 (3) ◽  
pp. 347-361 ◽  
Author(s):  
Vesna Ocelić Bulatović ◽  
Anamarija Turković ◽  
Emi Govorčin Bajsić ◽  
Romana Zovko ◽  
Antun Jozinović ◽  
...  
Keyword(s):  
Morphological Structure ◽  
Barrier Properties ◽  
Thermoplastic Starch ◽  
Packaging Material ◽  
Low Density Polyethylene ◽  
Scanning Calorimetry ◽  
Environmental Persistence ◽  
Short Service Life ◽  
The Impact ◽  
Scanning Electron

Low-density polyethylene (LDPE) is extensively used as packaging material, and as such has a short service life, but long environmental persistence. The alternative to reducing the impact of LDPE as packaging material on the environment is to blend it with carbohydrate-based polymers, like starch. Therefore, the focus of this investigation was to prepare bio-based blends of LDPE and thermoplastic starch (TPS) containing different amounts of TPS using a Brabender kneading chamber. Due to incompatibility of LDPE/ TPS blends, a styrene–ethylene/butylene–styrene block copolymer, grafted with maleic anhydride (SEBS-g-MA) containing 2 mol % anhydride groups, was added as a compatibilizer. The effect of the biodegradable, hydrophilic TPS, its content, and the incorporation of the compatibilizer on the properties of LDPE/TPS blends were analysed. The characterization was performed by means of thermogravimetric analysis (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and water absorption (WA). Based on the results of the morphological structure, a good dispersion of the TPS phase in LDPE matrix was obtained with the incorporation of compatibilizer, which resulted in better thermal and barrier properties of these materials.

scholarly journals Effects of Modified Thermoplastic Starch on Crystallization Kinetics and Barrier Properties of PLA

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4125
Author(s):  
Apoorva Kulkarni ◽  
Ramani Narayan
Keyword(s):  
Crystallization Rate ◽  
Soxhlet Extraction ◽  
Barrier Properties ◽  
Reactive Extrusion ◽  
Nucleating Agent ◽  
Thermoplastic Starch ◽  
Aqueous Environment ◽  
Screw Extruder ◽  
Avrami Analysis ◽  
Twin Screw

This study reports on using reactive extrusion (REX) modified thermoplastic starch particles as a bio-based and biodegradable nucleating agent to increase the rate of crystallization, percent crystallinity and improve oxygen barrier properties while maintaining the biodegradability of PLA. Reactive blends of maleated thermoplastic starch (MTPS) and PLA were prepared using a ZSK-30 twin-screw extruder; 80% glycerol was grafted on the starch during the preparation of MTPS as determined by soxhlet extraction with acetone. The crystallinity of PLA was found to increase from 7.7% to 28.6% with 5% MTPS. The crystallization temperature of PLA reduced from 113 °C to 103 °C. Avrami analysis of the blends showed that the crystallization rate increased 98-fold and t1/2 was reduced drastically from 20 min to <1 min with the addition of 5% MTPS compared to neat PLA. Observation from POM confirmed that the presence of MTPS in the PLA matrix significantly increased the rate of formation and density of spherulites. Oxygen and water vapor permeabilities of the solvent-casted PLA/MTPS films were reduced by 33 and 19% respectively over neat PLA without causing any detrimental impacts on the mechanical properties (α = 0.05). The addition of MTPS to PLA did not impact the biodegradation of PLA in an aqueous environment.

scholarly journals Production of starch/poly(lactic acid) sheets containing citric acid and tributyl citrate

2016 ◽  
Vol 7 (2) ◽  
pp. 173 ◽  
Author(s):  
Silvio José Souza ◽  
Nicolli Grecco Marchiore ◽  
Marcella Vitória Galindo ◽  
Fabio Yamashita ◽  
Marianne Ayumi Shirai
Keyword(s):  
Lactic Acid ◽  
Water Vapor ◽  
Citric Acid ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Vapor Permeability ◽  
Water Vapor Barrier

In this work thermoplastic starch and poly(lactic acid) (PLA) sheets added of tributyl citrate (TBC) and citric acid was produced by flat extrusion (calendaring-extrusion). The incorporation of TBC and citric acid reduced the rigidity, increased the water vapor permeability (WVP) and density of the sheets. This occurred probably because these compounds acted as plasticizer for PLA and starch. Thus, it was possible to conclude that it was possible to produce starch and PLA blended sheets by extrusion, but studies are still required to find the appropriate concentration of TBC and citric acid that does not significantly impair the water vapor barrier properties.

Thermal, mechanical, and barrier properties of polyethylene/surlyn/organoclay nanocomposites blown films prepared by different mixing methods

2014 ◽  
Vol 21 (1) ◽  
pp. 60-69 ◽  
Author(s):  
Homayoon Hosseinkhanli ◽  
Jamal Aalaie ◽  
Mahdi Abdollahi ◽  
Talat Khalkhali ◽  
Mehrdad Shojaei
Keyword(s):  
Barrier Properties ◽  
Blown Films
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