Processing Stabilization of Poly(3-Hydroxybutyrate)/Poly(Lactic Acid) Blends with Oligomeric Carbodiimide
| Autor: | Veronika Melčová, Jiří Tocháček, Premysl Mencik, Radek Prikryl |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering technology industry and agriculture Poly-3-hydroxybutyrate 02 engineering and technology Reactive extrusion 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Lactic acid chemistry.chemical_compound chemistry Mechanics of Materials Organic chemistry General Materials Science 0210 nano-technology Carbodiimide |
| Zdroj: | Materials Science Forum. 955:7-12 |
| ISSN: | 1662-9752 |
| Popis: | Reactivity of five reactive agents with two biopolyesters, poly (3-hydroxybutyrate) (PHB) and poly (lactic acid) (PLA), was studied in situ during processing in laboratory kneader with simultaneous recording of a melt torque. Among them only Raschig, an oligomeric carbodiimide based additive, was proven to enhance melt viscosity of both. In order to find out the most efficient level of this additive for stabilizing of both polymers and PHB/PLA (70/30 w/w) blend, different concentrations were studied by means of melt torque monitoring, rheology time tests and gel permeation chromatography. Results showed the same trend for neat polymers and their blend. Addition of more than 0.5 % wt. did not have any further positive effect on molecular weight or complex viscosity of the melt. Higher amount is not consumed during the reaction and is left in the sample. Therefore, this amount was used for processing stability studies on PHB/PLA blends by subsequent extrusion cycles. Melt volume-flow rate of extruded samples was obtained and results showed lower values for all stabilized blends comparing to the first extrusion sample of non-stabilized blend. At the same, stability of the blends is secured up to the third extrusion cycle. |
| Databáze: | OpenAIRE |
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