Engineering Biopolymers

Endres, Hans‐Josef; Siebert-Raths, Andrea

doi:10.3139/9783446430020

Cited by 99 publications

(59 citation statements)

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“…1 Depending on the isomeric content, the chemical as well as mechanical properties are changing. Additionally, the molecular weight influences the properties of this polar polymer.…”

Section: Pla and Phbv For Packaging Applicationsmentioning

confidence: 99%

“…Due to the longer side chain of PHV in comparison to PHB the melting and glass transmission temperatures are decreased, which leads to a lower crystallinity and better processing behaviour of the extremely thermosensitive PHB-(co)-polymers in an extrusion process. 1,6 Mechanical and barrier properties of both PHB and PHBV are shown in literature. 1,7 The water vapour transmission rate (WVTR) of PHBV-coated paper was revealed to be around four to six times lower than the equivalent of LDPE.…”

Section: Blending Of Polyhydroxybutyrate-co-valerate With Polylactic mentioning

confidence: 99%

“…1,6 Mechanical and barrier properties of both PHB and PHBV are shown in literature. 1,7 The water vapour transmission rate (WVTR) of PHBV-coated paper was revealed to be around four to six times lower than the equivalent of LDPE. 8 This was partly explained as a result of the high polarity of PHBV.…”

Section: Blending Of Polyhydroxybutyrate-co-valerate With Polylactic mentioning

confidence: 99%

“…These base materials show opposing properties in their processing as well as mechanical and barrier properties (regarding water vapour, oxygen and aroma). 1 With the target of combing the mechanical strength of PLA with the high barrier properties of PHBV, blends of these polyesters should be developed. Thereby, the drawbacks of the individual polymers should be compensated.…”

Section: Pla and Phbv For Packaging Applicationsmentioning

confidence: 99%

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Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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Biopolymers for packaging applications offer many advantages and are therefore of increasing interest. In order to develop a sustainable alternative for petrochemical-based polymers the biobased and biodegradable polymers, the focus of this work are polyhydroxybutyrate-co-valerate (PHBV) and polylactic acid (PLA) (and copolymers). Blending of these two biopolymers was reviewed under thermodynamic aspects and backed with own results. Additionally, different ways of improving the miscibility were performed by compatibilisers, peroxides, transesterification catalysts, and by blending PHBV with modified molecular weight. These blends were extruded as cast films, and characterised by means of mechanical and barrier properties. This study analyses the miscibility of PLA and PHB-copolyester (with approximately equal molar masses) and reports on the unusually high barrier properties in PLA and PHBV blends. However, the quality of blending, especially regarding barrier properties to interphase boundaries, depends on the compatibility of the components and the morphology of the blend. Our results suggest that a PHBV content of 20-35 % in PLA is the most suitable blend system in terms of compatibility and high barrier properties.

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“…1 Depending on the isomeric content, the chemical as well as mechanical properties are changing. Additionally, the molecular weight influences the properties of this polar polymer.…”

Section: Pla and Phbv For Packaging Applicationsmentioning

confidence: 99%

Section: Blending Of Polyhydroxybutyrate-co-valerate With Polylactic mentioning

confidence: 99%

Section: Blending Of Polyhydroxybutyrate-co-valerate With Polylactic mentioning

confidence: 99%

Section: Pla and Phbv For Packaging Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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“…For this purpose, three out of the thirteen synthesized DFAs were exemplarily selected and studied in the polycondensation with 1,10-diaminodecane, a renewable diamine derived from sebacic acid, [21,22] using 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as catalyst. In a first attempt, the polymerization of partially renewable DFA 5c was performed using 5.0 mol% TBD and 100 C as initial temperature (Scheme 5).…”

Section: Polymer Synthesismentioning

confidence: 99%

Synthesis of Dimer Fatty Acid Methyl Esters by Catalytic Oxidation and Reductive Amination: An Efficient Route to Branched Polyamides

Czapiewski

Meier

2017

Euro J Lipid Sci & Tech

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A novel and versatile route toward dimer fatty acid methyl esters (dimer FAMEs) via catalytic oxidation and reductive amination is described. The oxyfunctionalization of mono-unsaturated FAMEs bearing different chain lengths (C11, C18, C22) is accomplished by a co-catalyst-free Wacker Oxidation process in a high pressure reactor. The applied catalytic system of palladium(II) chloride in a dimethylacetamide/water mixture enabled the formation of ketoFAMEs in the presence of molecular oxygen as sole re-oxidant. In a first attempt, partially renewable dimer FAMEs are synthesized by reductive amination of keto-FAME (C18) in the presence of various aliphatic and aromatic diamines and sodium triacetoxyborohydride as selective reducing agent. In another approach, the keto-FAMEs directly underwent reductive amination using Raney-Nickel in order to obtain the corresponding aminoFAMEs. Subsequently, the keto-and amino-FAMEs are used for the synthesis of fully renewable dimer FAMEs via reductive amination with sodium triacetoxyborohydride as reducing agent. In order to demonstrate a possible application for these new dimer FAMEs, three out of the thirteen synthesized dimer FAMEs are selected and studied in a polycondensation with renewable 1,10-diaminodecane using TBD as catalyst. The polyamides are obtained in molecular weights (M n ) of up to 33 kDa and are carefully characterized by 1 H-NMR spectroscopy, FTIR, SEC, and DSC analysis. Practical Applications: The described catalytic route to defined dimer fatty acids has potential applications in lubricants, detergents, polymeric materials, and others. Compared to commercially available dimer fatty acids, a molecularly highly defined mixture of regioisomers is obtained, without contamination of monofunctional or trifunctional fatty acid derivatives, which is advantegous for most of the mentioned applications. Especially for polycondensations, the known stoichiometry of exactly two is a considerable benefit.

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Bioplastics

Lackner

2015

Kirk-Othmer Encyclopedia of Chemical Technology

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Bioplastics are biobased polymers with two sustainability concepts: biodegradability and renewability. On the one hand, bioplastics that biodegrade to CO 2 and H 2 O in the environment can be produced, eg, avoiding litter and damage to marine organisms. On the other hand, renewable feedstocks instead of petroleum can be used, for instance, corn, sugarcane, and algae, reducing dependence on crude oil and reducing the impact on the climate. Currently, bioplastics have a market share of ∼1%, yet they experience annual growth rates in excess of 20–30%. This article highlights some key aspects associated with bioplastics, the performance of which can be tailored to meet that of petrochemical polymers or to offer new properties, eg, by blending and additivation. Important bioplastics are TPS (thermoplastic starch), PLA (polylactic acid), PHAs (polyhydroxyalkanoates), and bio‐PE, bio‐PP, and bio‐PET, which contain at least some renewable carbon.

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Engineering Biopolymers

Cited by 99 publications

References 0 publications

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Synthesis of Dimer Fatty Acid Methyl Esters by Catalytic Oxidation and Reductive Amination: An Efficient Route to Branched Polyamides

Bioplastics

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