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Morphological, thermal, and mechanical studies of film elaborated with the blend low‐density polyethylene and chemical‐modified banana starch
Author(s) -
Torres Apolonio Vargas,
ZamudioFlores Paul Baruk,
SalgadoDelgado René,
BelloPérez Luis Arturo
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27051
Subject(s) - differential scanning calorimetry , starch , materials science , polyethylene , polymer , low density polyethylene , ultimate tensile strength , polymer chemistry , scanning electron microscope , chemical engineering , extrusion , composite material , enthalpy , chemistry , organic chemistry , physics , engineering , thermodynamics , quantum mechanics
Films were prepared by extrusion acetylated and oxidized banana starches at different concentration mixed with low‐density polyethylene. Morphological, mechanical, and thermal characteristics of the films were tested. Irregularities in the films prepared with native and oxidized banana starches were observed by scanning electron microscopy. This pattern is maybe due to the incompatibility between both polymers. However, films elaborated with acetylated banana starch showed a smooth surface. The tensile strength and elongation at break decreased when starch level in the blend increased. An inverse pattern was showed for elastic module. The effect on mechanical properties was more notorious in those films elaborated with the acetylated and oxidized banana starches. Two thermal transitions were observed by differential scanning calorimetry, the principal transition at ∼ 111°C was due to disorganization of the low‐density polyethylene. Enthalpy value associated to that principal transition was higher in the films elaborated with acetylated banana starch, showing higher compatibility between both polymers. The use of biodegradable polymers such as chemically modified banana starch might be feasible for elaboration of films with adequate mechanical properties. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007