Refine your search:
or Author Index

Original Article

The effect of gelatin amount on the properties of PLA/TPS/gelatin extruded sheets

Pizzoli, Ana Paula de Oliveira; Yamashita, Fabio; Gonçalves, Odinei Hess; Shirai, Marianne Ayumi; Leimann, Fernanda Vitória
Abstract:
Films and sheets composed by poly (lactic acid) (PLA)/thermoplastic starch (TPS) and TPS/gelatin blends have already been produced and characterized in the literature. However, materials produced with these three biopolymers have not been clearly investigated. In this work, extruded sheets were produced with PLA, TPS (glycerol as plasticizer) and different amounts of gelatin (0, 1, 3 and 5 wt%) in a pilot scale co-rotating twin-screw extruder coupled with a calender. The extruded sheets were characterized in regards to their water solubility, thickness, density, water vapor permeability (WVP), moisture sorption isotherms, mechanical properties and microstructure. The results showed an increase in solubility and WVP besides a decrease of about 30% in tensile strength, Young's modulus and elongation at break. Extruded sheets microstructure revealed smother surfaces and homogeneous morphology with the addition of gelatin. The experiments demonstrated that extrusion and calendering process is a viable way to produce PLA/TPS/gelatin sheets with interesting properties.
Keywords:
biodegradable polymers, extrusion-calendering, hydrophilicity, mechanical characterization, microstructure.


Editora Cubo FAQ Helpdesk
BibTeX
RIS
APA
Harvard
IEEE
MLA
Vancouver
Chicago