Obtaining a Flexible Film Elaborated from Cassava Thermoplastic Starch and Polylactic Acid

Abstract

A flexible film was obtained from a blend of cassava thermoplastic starch and polylactic acid, using maleic anhydride as coupling agent. For this, an experimental design with three factors was used: polylactic acid content, coupling agent content, and temperature profile of the blown extrusion. It was found that the three factors generated significant differences on the response variables of tensile mechanical properties individually as in their triple interaction. Differential scanning calorimetry (DSC) was used by understanding the behavior of thermal properties of TPS/PLA blends with and without coupling agent, finding similar results between both. From this, the combination with 28% polylactic acid, 0.87% coupling agent, and 155.75°C temperature profile permitted the obtaining of a material with outstanding mechanical properties and offered advantages from the economic point of view.

Evaluation of a biodegradable color concentrate in bags for coffee seedlings

“…The biodegradable flexible film was obtained based on the process conditions established by Arboleda et al [24], with some modifications. It began with the obtaining of the binary mixture (MB), for this native cassava starch (moisture<11%) was pre-mixed with the plasticizer (glycerin) in a 70:30 ratio, in addition, the lubricant (Stearic acid) was added in a 95:05 relationship, and left at rest for 48 hours.…”

Enhancing distributive mixing of immiscible polyethylene/thermoplastic starch blend through zeolite ZSM-5 compounding sequence

“…The two endothermic transitions of the PE/TPS blend observed at temperatures of 122 and 199 C correspond to melting points (T m s) of PE and TPS (Arboleda, Montilla, Villada, & Varona, 2015), respectively (Fig. 6).…”

The Quantitative Nanomechanical Mapping of Starch/Kaolin Film Surfaces by Peak Force AFM

“…Notwithstanding the papers already published, intensive research is still being carried out to improve the quality and properties of biomaterials, including the possibility of using biomaterials films [ 2 , 3 , 4 ]. Therefore, biopolymers such as starch, chitosan and PLA are being blended with synthetic polymers [ 5 , 6 , 7 , 8 ], and biomatrices are being reinforced by fibres and particles [ 2 , 9 , 10 , 11 ]. Nanoadditives, such as layered silicates (e.g., bentonite [ 12 ], montmorillonite [ 13 , 14 ], wollastonite [ 15 ], kaolin [ 16 , 17 ] and talc [ 18 ]), carbon nanotubes [ 19 , 20 ], silver nanoparticles [ 14 ], cuttlebone powder [ 21 ] and essential oils [ 22 , 23 ], showed good dispersion and compatibility with biopolymer matrices.…”