Thematische Bibliographien / Poly(3-hydroxybutyrate-co-4-hydroxybutyrate); rheological properties; biodegradation

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  2. Dissertationen

Auswahl der wissenschaftlichen Literatur zum Thema „Poly(3-hydroxybutyrate-co-4-hydroxybutyrate); rheological properties; biodegradation“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 4. Februar 2022

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Zeitschriftenartikel zum Thema "Poly(3-hydroxybutyrate-co-4-hydroxybutyrate); rheological properties; biodegradation"

1

Andree�en, Bj�rn, und Alexander Steinb�chel. „Biosynthesis and Biodegradation of 3-Hydroxypropionate- Containing Polyesters“. Applied and Environmental Microbiology 76, Nr. 15 (11.06.2010): 4919–25. http://dx.doi.org/10.1128/aem.01015-10.

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ABSTRACT 3-Hydroxypropionate (3HP) is an important compound in the chemical industry, and the polymerized 3HP can be used as a bioplastic. In this review, we focus on polyesters consisting of 3HP monomers, including the homopolyester poly(3-hydroxypropionate) and copolyesters poly(3-hydroxybutyrate-co-3-hydroxypropionate), poly(3-hydroxypropionate-co-3-hydroxybutyrate-co-3-hydroxyhexanoate-co-3-hydroxyoctanoate), poly(4-hydroxybutyrate-co-3-hydroxypropionate-co-lactate), and poly(3-hydroxybutyrate-co-3-hydroxypropionate-co-4-hydroxybutyrate-co-lactate). Homopolyesters like poly(3-hydroxybutyrate) are often highly crystalline and brittle, which limits some of their applications. The incorporation of 3HP monomers reduces the glass transition temperature, the crystallinity, and also, at up to 60 to 70 mol% 3HP, the melting point of the copolymer. This review provides a survey of the synthesis and physical properties of different polyesters containing 3HP.
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Zhuikov, Vsevolod, Alexey Rusakov, Alexey Useinov, Elizaveta Akulina und Vera Voinova. „Biodegradation of Poly(3-Hydroxybutyrate) and Poly(3-Hydroxybutyrate-Co-3-Hydroxy-4-Methylvalerate) Films by Porcine Pancreatic Lipase“. Key Engineering Materials 779 (September 2018): 57–63. http://dx.doi.org/10.4028/www.scientific.net/kem.779.57.

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In the current work, the degradation of poly (3-hydroxybutyrate) (PHB) and poly (3-hydroxybutyrate-co-3-hydroxy-4-methylvalerate) (PHB4MV) films was studied in vitro by pancreatic lipase. The changes in film properties were traced by several analytical methods: the change of weight, molecular weight, and Young’s modulus (by nanoindentation) were measured. During the six months of polymer films degradation the weight of samples decreased slightly, while a great increase in Young's modulus due to the relatively fast degradation of the amorphous areas was observed, as well as molecular weight of polymers decreased significantly. Weight loss of PHB4MV is faster than degradation rate of PHB, but the molecular weight of PHB 1700 decrease rapidly than PHB4MV; the Young’s modulus of polymers remained relatively unchanged.
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Li, Yi, Yutong Lei, Shilong Yao, Changyu Han, Yancun Yu und Liguang Xiao. „Miscibility, crystallization, rheological and mechanical properties of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/poly(vinyl acetate) blends“. Thermochimica Acta 693 (November 2020): 178755. http://dx.doi.org/10.1016/j.tca.2020.178755.

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4

Bian, Yijie, Lijing Han, Changyu Han, Haijuan Lin, Huiliang Zhang, Junjia Bian und Lisong Dong. „Intriguing crystallization behavior and rheological properties of radical-based crosslinked biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)“. CrystEngComm 16, Nr. 13 (2014): 2702. http://dx.doi.org/10.1039/c3ce42498g.

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Wang, Xiang-Yu, Hong-Wei Pan, Shi-Ling Jia, Zeng-Wen Cao, Li-Jing Han, Hui-Liang Zhang und Li-Song Dong. „Mechanical Properties, Crystallization and Biodegradation Behavior of the Polylactide/Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/Poly(butylene adipate-co-terephthalate) Blown Films“. Chinese Journal of Polymer Science 38, Nr. 10 (19.05.2020): 1072–81. http://dx.doi.org/10.1007/s10118-020-2418-6.

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6

Zhao, Hongwei, Yijie Bian, Yi Li, Qinglin Dong, Changyu Han und Lisong Dong. „Bioresource-based blends of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and stereocomplex polylactide with improved rheological and mechanical properties and enzymatic hydrolysis“. Journal of Materials Chemistry A 2, Nr. 23 (2014): 8881. http://dx.doi.org/10.1039/c4ta01194e.

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7

Li, Mei, Zhi Qiang Li, Jun Xu, Dun Sheng Wei, Hong Wei Zhu und Dong Li. „Thermal Property, Morphology, Mechanical and Rheological Properties of a Modified Bio-Polymers Prepared by Blending Poly(3-Hydrobutyrate-Co-4-Hydrobutyrate) with Chain Extenders“. Advanced Materials Research 152-153 (Oktober 2010): 924–30. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.924.

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Modified Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] was prepared by melt reactive blending P(3HB-co-4HB) with chain extenders (ADR-4367). Thermal transitions, spherulitic and freeze-fracture morphology, mechanical and rheological properties of the chain extended bio-materials were investigated. The results show that glass transition temperatures and crystallization temperatures increase, crystallinity and diameters of spherulites decrease, there are amorphous parts dispersed among the crystalline phase, and the bio-materials transfer from brittleness to toughness and ductility. Steady shear viscosity of the modified P(3HB-co-4HB) increases by about one order of magnitude, melts of the modified P(3HB-co-4HB) behave more viscoelasticity by storage modulus and loss modulus correlated with oscillatory shear frequency. Addition of ADR-4367 with contents of 4~6 wt% in the blends is enough to branching and coupling the co-polymer chains and brings remarkable effect on improving mechanical properties, steady shear viscosity and viscoelasticity.
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Dissertationen zum Thema "Poly(3-hydroxybutyrate-co-4-hydroxybutyrate); rheological properties; biodegradation"

1

Černeková, Nicole. „Studium reologických vlastností a biodegradace poly (3-hydroxybutyrátu-co-4-hydroxybutyrátu)“. Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444538.

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This diploma thesis deals with the characterization of rheological properties and biodegradation of a poly(3-hydroxy-co-4-hydroxybutyrate), a copolymer produced by a strain of Cupriavidus malaysiensis. The theoretical part focuses on the rheology and degradation of polymers in general. It also contains the basic characteristics of polyhydroxyalkanoates and deals in more details with the description of the studied copolymer, its properties, synthesis, decomposition and possibilities of its applications. In the experimental part, the given copolymer was investigated in its native form and also in the form of copolymer mixtures filaments, which were enriched with additives (stabilizers and plasticizers). In terms of rheology, the samples showed pseudoplastic behaviour, which was slightly limited by the plasticization of the material. The highest thermal stability observed as a function of changes in complex viscosity over time was observed in a sample of a copolymer mixture containing stabilizers and plasticizer Citrofol BII. The plasticization also caused significant changes in thermal properties, especially crystallinity, which decreased compared to the native copolymer. In vitro degradation studies of samples in the form of films prepared by dissolving copolymer mixtures in chloroform were performed in phosphate buffer with lipase, in simulated body fluid and in synthetic gastric juice. The course of the process itself was characterized by the method of determining the molecular weight (SEC-MALLS) and the weight loss over time (gravimetrically). The results showed that the analysed samples are subject to degradation in all used environments. The most considerable molecular weight loss after 105 days (76 %) was observed in the sample containing stabilizers and plasticizer Citrofol BII in the environment of synthetic gastric juice. The most extensive gravimetric weight loss was attributed to the sample with stabilizers and without plasticizers, in the environment of phosphate buffer with lipase, specifically by 79%.
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