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International Journal of Biological Macromolecules

International Journal of Biological Macromolecules

IF: 7.7
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Effect of calcium stearate as a lubricant and catalyst on the thermal degradation of poly(3-hydroxybutyrate)

Published:1 November 2021 DOI: 10.1016/j.ijbiomac.2021.09.030 PMID: 34517031
Denis Mihaela Panaitescu , Marius Stelian Popa , Valentin Raditoiu , Adriana Nicoleta Frone , Liviu Sacarescu , Augusta Raluca Gabor , Cristian Andi Nicolae , Mircea Teodorescu

Abstract

Poly(3-hydroxybutyrate) (PHB) is a promising substitute to petroleum-based polymers in packaging and biomedical applications provided that its melt processability and degradability are improved. A new method to control the properties of PHB by using cheap calcium stearate (CS) as a lubricant and decomposition catalyst in melt-mixed PHB-CS compounds was first used. CS is composed of a metallic cation, which promotes PHB degradation, and a hydrophobic anion that improves the compatibility with PHB and processability. An environmentally friendly melt mixing technique was employed to obtain the PHB-CS compounds. Incorporation of 0.5 or 5?wt% CS reduced the melt viscosity and molecular weight of PHB, decreased the melting temperature with up to 5?°C, the crystallization temperature with more than 25?°C, and the degradation temperature with 15 and 40?°C, respectively. In small amounts (0.05?wt%), CS improved the processability and mechanical properties of PHB. In higher amount (0.5?wt%), CS slightly improved the Young's modulus, reduced the tensile strength and enhanced degradation. A better control of thermal and mechanical properties of PHB is, thus, possible by using different CS amount and processing conditions. These results are relevant for PHB application in the context of the global transition to biodegradable packaging.

Substances (4)

Related products
Procduct Name CAS Molecular Formula Supplier Price
Calcium stearate 1592-23-0 C36H70CaO4 614 suppliers $5.00-$1341.00
CITRATE SYNTHASE 9027-96-7 C6H5O7-3 44 suppliers $69.60-$770.00
BIOPOL 29435-48-1 (C4H8O3)x 41 suppliers $175.00-$1030.00
POLY(3-HYDROXYBUTYRIC ACID) 26063-00-3 C12H18O6X2 16 suppliers $96.00-$1500.00

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