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Synthesis and characterization of a new type of levan-graft-polystyrene copolymer

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2016
Authors
Kekez, Branka
Gojgić-Cvijović, Gordana
Jakovljević, Dragica
Pavlović, Vladimir B.
Beškoski, Vladimir
Popović, Aleksandar R.
Vrvić, Miroslav
Nikolić, Vladimir
Article (Published version)
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Abstract
Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could poten...tially have many applications, such as compatibilizers and material for membranes.

Keywords:
Levan / Microbial polysaccharide / Styrene / Graft copolymer
Source:
Carbohydrate Polymers, 2016, 154, 20-29
Publisher:
  • Elsevier Sci Ltd, Oxford
Projects:
  • Simultaneous Bioremediation and Soilification of Degraded Areas to Preserve Natural Resources of Biologically Active Substances, and Development and Production of Biomaterials and Dietetic Products (RS-43004)
  • The study of physicochemical and biochemical processes in living environment that have impacts on pollution and the investigation of possibilities for minimizing the consequences (RS-172001)

DOI: 10.1016/j.carbpol.2016.08.001

ISSN: 0144-8617

PubMed: 27577892

WoS: 000382318800004

Scopus: 2-s2.0-84981520571
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1930
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