Assessmento of UV exposure and aerobic biodegradation of poly(butylene adipate-co-terephthalate)/starch blend films coated with radiation-curable print links containing degradation-promoting additives
Carregando...
Data
Data de publicação
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Industrial Crops and Products
ODS
Exportar
Resumo
Biodegradable poly(butylene adipate-co-terephthalate) (PBAT) and thermoplastic starch (TPS) blend
films were printed with white, yellow, red, blue, and black inks based on epoxy acrylate resin. Clear
PBAT/TPS films were used as the control. Ink formulations were also modified with (1% w/w) and without
the degradation-promoting additives cobalt stearate (CoSt) or cerium stearate (CeSt). Printed PBAT/TPS
films were cured under ultravioletlight emitted by a medium-pressure mercury lamp at 10.3 kWm−2, and
then further aged in a accelerated weathering chamber at a total irradiance of 0.89Wm−2 continuously
for 250 h at 50 ± 3 ◦C. Subsequently, samples were exposed to an aerobic composting biodegradation process at 58 ◦C and 55% relative humidity for 60 d. Color (L*, a* and b*), gloss and hardness indexes, as well
as FTIR spectra, were obtained. Thermal properties and molecular structure were monitored before and
after UV exposure and biodegradation tests. The addition of CoSt affected the color, gloss and hardness of
the samples exposed to UV aging. The degradation ofthe PBAT/TPS + CoSt films depended on the nature of
the ink pigment and on their capacity to absorb UV photons. UV exposure of PBAT/TPCS samples resulted
in a larger reduction of weight average molecular weight (M¯ w) and the evolution of CO2. The incorporation of the degradation-promoting additives increased the sensitivity of the films to UV degradation, and
CoSt had a large impact in the final M¯ w of the samples.
Como referenciar
BARDI, MARCELO A.G.; MUNHOZ, MARA M.L.; AURAS, RAFAEL A.; MACHADO, LUCI D.B. Assessmento of UV exposure and aerobic biodegradation of poly(butylene adipate-co-terephthalate)/starch blend films coated with radiation-curable print links containing degradation-promoting additives. Industrial Crops and Products, v. 60, p. 326-334, 2014. DOI: 10.1016/j.indcrop.2014.06.042. Disponível em: http://repositorio.ipen.br/handle/123456789/23182. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.