Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends

Blends of poly(butylene adipate-<i>co</i>-terephthalate) (PBAT) and polylactide (PLA) have attracted the attention of academia and industry as a sustainable material. Unfortunately, this combination results in problems related to poor miscibility on the molecular level. This study mainly...

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Autores principales:	Shen Su, Rodion Kopitzky, Christian Berrenrath
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	DSC glass transition temperature <i>T<sub>g</sub></i> hydrolysis melt blending methanolysis blend miscibility Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/0a8db4501ede4a1e93d776f9c64d95f1
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spelling	oai:doaj.org-article:0a8db4501ede4a1e93d776f9c64d95f12021-11-11T18:43:55ZExperimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends10.3390/polym132136862073-4360https://doaj.org/article/0a8db4501ede4a1e93d776f9c64d95f12021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3686https://doaj.org/toc/2073-4360Blends of poly(butylene adipate-<i>co</i>-terephthalate) (PBAT) and polylactide (PLA) have attracted the attention of academia and industry as a sustainable material. Unfortunately, this combination results in problems related to poor miscibility on the molecular level. This study mainly aims to determine the influence of molecular weights on the miscibility of PBAT/PLA blends. First, polymers with various molecular weights were obtained by the hydrolysis of PBAT and methanolysis of PLA. Second, the two components were solution-blended with different molecular weights and weight ratios. Third, each blend was heated to the molten state and subsequently stored at room temperature. Finally, the samples were tested using DSC and SEM. The thermal analysis indicated that the difference in glass transition temperature between both components decreased from about 91 °C to 57 °C and 0 °C, as the number-average molecular weights (<i>M<sub>n</sub></i>) decreased from 52/127 to 9.4/9 and 6.3/6.6 kg/mol. Moreover, the morphology changed from phase-separated with dispersed large particles gradually to uniform and homogeneous. This experimental work validated the trends predicted in the previous study, namely that PBAT/PLA blends changed the state from immiscible to partially miscible to fully miscible with decreasing <i>M<sub>n</sub></i> values. Moreover, we discussed the influencing factors such as weight ratio, temperature, and molecular structure on the miscibility. Based on the results, this work contributes to developing partially miscible and compatible blends without additives.Shen SuRodion KopitzkyChristian BerrenrathMDPI AGarticleDSCglass transition temperature <i>T<sub>g</sub></i>hydrolysismelt blendingmethanolysisblend miscibilityOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3686, p 3686 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	DSC glass transition temperature <i>T<sub>g</sub></i> hydrolysis melt blending methanolysis blend miscibility Organic chemistry QD241-441
spellingShingle	DSC glass transition temperature <i>T<sub>g</sub></i> hydrolysis melt blending methanolysis blend miscibility Organic chemistry QD241-441 Shen Su Rodion Kopitzky Christian Berrenrath Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
description	Blends of poly(butylene adipate-<i>co</i>-terephthalate) (PBAT) and polylactide (PLA) have attracted the attention of academia and industry as a sustainable material. Unfortunately, this combination results in problems related to poor miscibility on the molecular level. This study mainly aims to determine the influence of molecular weights on the miscibility of PBAT/PLA blends. First, polymers with various molecular weights were obtained by the hydrolysis of PBAT and methanolysis of PLA. Second, the two components were solution-blended with different molecular weights and weight ratios. Third, each blend was heated to the molten state and subsequently stored at room temperature. Finally, the samples were tested using DSC and SEM. The thermal analysis indicated that the difference in glass transition temperature between both components decreased from about 91 °C to 57 °C and 0 °C, as the number-average molecular weights (<i>M<sub>n</sub></i>) decreased from 52/127 to 9.4/9 and 6.3/6.6 kg/mol. Moreover, the morphology changed from phase-separated with dispersed large particles gradually to uniform and homogeneous. This experimental work validated the trends predicted in the previous study, namely that PBAT/PLA blends changed the state from immiscible to partially miscible to fully miscible with decreasing <i>M<sub>n</sub></i> values. Moreover, we discussed the influencing factors such as weight ratio, temperature, and molecular structure on the miscibility. Based on the results, this work contributes to developing partially miscible and compatible blends without additives.
format	article
author	Shen Su Rodion Kopitzky Christian Berrenrath
author_facet	Shen Su Rodion Kopitzky Christian Berrenrath
author_sort	Shen Su
title	Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
title_short	Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
title_full	Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
title_fullStr	Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
title_full_unstemmed	Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends
title_sort	experimental determination of molecular weight-dependent miscibility of pbat/pla blends
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0a8db4501ede4a1e93d776f9c64d95f1
work_keys_str_mv	AT shensu experimentaldeterminationofmolecularweightdependentmiscibilityofpbatplablends AT rodionkopitzky experimentaldeterminationofmolecularweightdependentmiscibilityofpbatplablends AT christianberrenrath experimentaldeterminationofmolecularweightdependentmiscibilityofpbatplablends
_version_	1718431745468006400

Experimental Determination of Molecular Weight-Dependent Miscibility of PBAT/PLA Blends

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