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The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films

The objective of this work was to investigate blend ratio and storage time effects on the morphological, mechanical, and thermal properties of thermoplastic starch/poly(butylene adipate-co-terephthalate) (TPS/PBAT) films. TPS was prepared from plasticized cassava starch using a twin-screw extruder....

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Autores principales: Garalde, Ray Anne, Thipmanee, Ranumas, Jariyasakoolroj, Piyawanee, Sane, Amporn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6475639/
https://www.ncbi.nlm.nih.gov/pubmed/31016252
http://dx.doi.org/10.1016/j.heliyon.2019.e01251
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author Garalde, Ray Anne
Thipmanee, Ranumas
Jariyasakoolroj, Piyawanee
Sane, Amporn
author_facet Garalde, Ray Anne
Thipmanee, Ranumas
Jariyasakoolroj, Piyawanee
Sane, Amporn
author_sort Garalde, Ray Anne
collection PubMed
description The objective of this work was to investigate blend ratio and storage time effects on the morphological, mechanical, and thermal properties of thermoplastic starch/poly(butylene adipate-co-terephthalate) (TPS/PBAT) films. TPS was prepared from plasticized cassava starch using a twin-screw extruder. TPS was subsequently melt-blended with PBAT with varied weight ratios (i.e., 20/80, 40/60 and 60/40) and blown to form TPS/PBAT films. It was found that increasing the TPS/PBAT ratio to 40/60 led to improved distributions of polymeric components and increased PBAT crystallization temperatures while reducing TPS melting transitions and tensile properties of TPS/PBAT films. After three months of storage at 30 °C, the tensile strength and secant modulus at 2% strain of TPS/PBAT films increased due to recrystallization of both TPS and PBAT. Blend ratios were the primary determinant for changes in TPS/PBAT film elongation at break with this storage time. Elongation at break decreased at low TPS:PBAT ratios (i.e., 20/80) and increased at high blend ratios (i.e., 60/40). The recrystallization of both TPS and PBAT components were observed from XRD and DSC analyses. Results obtained from both techniques confirmed the formation of additional crystalline structures of individual components during storage. The recrystallization phenomena also affected thermal transition temperatures of blend components. The crystallization temperature of PBAT-rich phase increased as starch could act as nucleating sites for PBAT. Using DMA, the tan δ curve of TPS/PBAT film exhibited two sharp individual peaks corresponding to the glass transitions of PBAT-rich and starch-rich phases. The tan δ of TPS-rich phase shifted to higher temperature due to recrystallization of TPS-rich phase.
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spelling pubmed-64756392019-04-23 The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films Garalde, Ray Anne Thipmanee, Ranumas Jariyasakoolroj, Piyawanee Sane, Amporn Heliyon Article The objective of this work was to investigate blend ratio and storage time effects on the morphological, mechanical, and thermal properties of thermoplastic starch/poly(butylene adipate-co-terephthalate) (TPS/PBAT) films. TPS was prepared from plasticized cassava starch using a twin-screw extruder. TPS was subsequently melt-blended with PBAT with varied weight ratios (i.e., 20/80, 40/60 and 60/40) and blown to form TPS/PBAT films. It was found that increasing the TPS/PBAT ratio to 40/60 led to improved distributions of polymeric components and increased PBAT crystallization temperatures while reducing TPS melting transitions and tensile properties of TPS/PBAT films. After three months of storage at 30 °C, the tensile strength and secant modulus at 2% strain of TPS/PBAT films increased due to recrystallization of both TPS and PBAT. Blend ratios were the primary determinant for changes in TPS/PBAT film elongation at break with this storage time. Elongation at break decreased at low TPS:PBAT ratios (i.e., 20/80) and increased at high blend ratios (i.e., 60/40). The recrystallization of both TPS and PBAT components were observed from XRD and DSC analyses. Results obtained from both techniques confirmed the formation of additional crystalline structures of individual components during storage. The recrystallization phenomena also affected thermal transition temperatures of blend components. The crystallization temperature of PBAT-rich phase increased as starch could act as nucleating sites for PBAT. Using DMA, the tan δ curve of TPS/PBAT film exhibited two sharp individual peaks corresponding to the glass transitions of PBAT-rich and starch-rich phases. The tan δ of TPS-rich phase shifted to higher temperature due to recrystallization of TPS-rich phase. Elsevier 2019-03-07 /pmc/articles/PMC6475639/ /pubmed/31016252 http://dx.doi.org/10.1016/j.heliyon.2019.e01251 Text en © 2019 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Garalde, Ray Anne
Thipmanee, Ranumas
Jariyasakoolroj, Piyawanee
Sane, Amporn
The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title_full The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title_fullStr The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title_full_unstemmed The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title_short The effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
title_sort effects of blend ratio and storage time on thermoplastic starch/poly(butylene adipate-co-terephthalate) films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6475639/
https://www.ncbi.nlm.nih.gov/pubmed/31016252
http://dx.doi.org/10.1016/j.heliyon.2019.e01251
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