TY - JOUR
T1 - Biodegradability of polyethylene-starch blends prepared by extrusion and molded by injection
T2 - Evaluated by response surface methodology
AU - Vieyra Ruiz, Horacio
AU - Martínez, Eduardo San Martín
AU - Méndez, Miguel Ãngel Aguilar
PY - 2011/1
Y1 - 2011/1
N2 - Low density polyethylene (LDPE)-starch blends were prepared by extrusion. Starch content ranged between 0 and 50% under different conditions of temperature and extrusion speed. Each blend was injected into a commercial mold of a 250 mL cup. Cups were cut into 5 cm × 5 cm coupons. Biodegradability was assessed placing the coupons in the middle of a 50 cm pile of compost. Samples were recovered, washed, dried, and weighed after 25, 50, 75, 100, and 125 days under compost. Weight loss was determined and structural modifications were evaluated by SEM. Mechanical properties as tensile strength, elongation to break, and yield point were assessed before and after compost treatment. Experimental design and characterization were performed using a central composite design (CCD) and results were modeled with surface response methodology. SEM analysis revealed fractures and pores as a consequence of microorganism degradation. Pure LDPE samples remained unchanged. Mechanical, physical, and thermal properties of LDPE-starch blends are slightly different from that of pure LDPE. Environmental exposure, measured by accelerated intemperism, does not modify blend properties; consequently, they are suitable for the same industrial applications of LDPE.
AB - Low density polyethylene (LDPE)-starch blends were prepared by extrusion. Starch content ranged between 0 and 50% under different conditions of temperature and extrusion speed. Each blend was injected into a commercial mold of a 250 mL cup. Cups were cut into 5 cm × 5 cm coupons. Biodegradability was assessed placing the coupons in the middle of a 50 cm pile of compost. Samples were recovered, washed, dried, and weighed after 25, 50, 75, 100, and 125 days under compost. Weight loss was determined and structural modifications were evaluated by SEM. Mechanical properties as tensile strength, elongation to break, and yield point were assessed before and after compost treatment. Experimental design and characterization were performed using a central composite design (CCD) and results were modeled with surface response methodology. SEM analysis revealed fractures and pores as a consequence of microorganism degradation. Pure LDPE samples remained unchanged. Mechanical, physical, and thermal properties of LDPE-starch blends are slightly different from that of pure LDPE. Environmental exposure, measured by accelerated intemperism, does not modify blend properties; consequently, they are suitable for the same industrial applications of LDPE.
KW - Biodegradable
KW - Corn starch
KW - Extrusion
KW - Injection
KW - Polyethylene
UR - http://www.scopus.com/inward/record.url?scp=78651324405&partnerID=8YFLogxK
U2 - 10.1002/star.201000075
DO - 10.1002/star.201000075
M3 - Artículo
SN - 0038-9056
VL - 63
SP - 42
EP - 51
JO - Starch/Staerke
JF - Starch/Staerke
IS - 1
ER -