Rheological Characteristics of Starch-Based Biodegradable Blends

Thermoplastic starch was blended with commercially available biodegradable polyesters of poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) for its improved performance and processability. The morphology and elemental composition of these biodegradable polymer blends were obs...

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Veröffentlicht in:Polymers 2023-04, Vol.15 (8), p.1953
Hauptverfasser: Park, Dong-Il, Dong, Yuzhen, Wang, Shizhao, Lee, Soo-Jeong, Choi, Hyoung Jin
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container_end_page
container_issue 8
container_start_page 1953
container_title Polymers
container_volume 15
creator Park, Dong-Il
Dong, Yuzhen
Wang, Shizhao
Lee, Soo-Jeong
Choi, Hyoung Jin
description Thermoplastic starch was blended with commercially available biodegradable polyesters of poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) for its improved performance and processability. The morphology and elemental composition of these biodegradable polymer blends were observed by scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively, while their thermal properties were analyzed using thermogravimetric analysis and differential thermal calorimetry. For rheological analysis, the steady shear and dynamic oscillation tests of three samples at various temperatures were investigated using a rotational rheometer. All three samples exhibited significant shear thinning at all measured temperatures, and their shear viscosity behavior was plotted using the Carreau model. The frequency sweep tests showed that the thermoplastic starch sample exhibited a solid state at all temperatures tested, whereas both starch/PBAT and starch/PBAT/PLA blend samples exhibited viscoelastic liquid behavior after the melting temperature such that their loss modulus at low frequencies was greater than the storage modulus, and inversion occurred at high frequencies (storage modulus > loss modulus).
doi_str_mv 10.3390/polym15081953
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The frequency sweep tests showed that the thermoplastic starch sample exhibited a solid state at all temperatures tested, whereas both starch/PBAT and starch/PBAT/PLA blend samples exhibited viscoelastic liquid behavior after the melting temperature such that their loss modulus at low frequencies was greater than the storage modulus, and inversion occurred at high frequencies (storage modulus &gt; loss modulus).</description><identifier>ISSN: 2073-4360</identifier><identifier>EISSN: 2073-4360</identifier><identifier>DOI: 10.3390/polym15081953</identifier><identifier>PMID: 37112100</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Bioplastics ; Butylene ; Calorimetry ; Chemical elements ; Glycerol ; Loss modulus ; Mechanical properties ; Melt temperature ; Plastics ; Polyester resins ; Polylactic acid ; Polymer blends ; Polymers ; Polyols ; Polyvinyl alcohol ; Rheological properties ; Rheology ; Scanning electron microscopy ; Shear thinning (liquids) ; Shear viscosity ; Storage modulus ; Tensile strength ; Thermal properties ; Thermodynamic properties ; Thermogravimetric analysis ; Thermoplastics ; Viscoelastic liquids ; Viscoelasticity ; Viscosity</subject><ispartof>Polymers, 2023-04, Vol.15 (8), p.1953</ispartof><rights>COPYRIGHT 2023 MDPI AG</rights><rights>2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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The frequency sweep tests showed that the thermoplastic starch sample exhibited a solid state at all temperatures tested, whereas both starch/PBAT and starch/PBAT/PLA blend samples exhibited viscoelastic liquid behavior after the melting temperature such that their loss modulus at low frequencies was greater than the storage modulus, and inversion occurred at high frequencies (storage modulus &gt; loss modulus).</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>37112100</pmid><doi>10.3390/polym15081953</doi><orcidid>https://orcid.org/0000-0001-6915-4882</orcidid><orcidid>https://orcid.org/0009-0003-0626-0006</orcidid><oa>free_for_read</oa></addata></record>
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subjects Bioplastics
Butylene
Calorimetry
Chemical elements
Glycerol
Loss modulus
Mechanical properties
Melt temperature
Plastics
Polyester resins
Polylactic acid
Polymer blends
Polymers
Polyols
Polyvinyl alcohol
Rheological properties
Rheology
Scanning electron microscopy
Shear thinning (liquids)
Shear viscosity
Storage modulus
Tensile strength
Thermal properties
Thermodynamic properties
Thermogravimetric analysis
Thermoplastics
Viscoelastic liquids
Viscoelasticity
Viscosity
title Rheological Characteristics of Starch-Based Biodegradable Blends
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