Synthesis and thermal characterization of xylan-graft-polyacrylonitrile

Cüneyt H. Ünlü, N. Simge Öztekin, Oya Galioǧlu Atici*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

In this study emulsion polymerization of acrylonitrile using xylan from agricultural waste material (corn cob) and cerium ammonium nitrate was investigated in terms of catalyst acid. Stock ceric solutions were prepared using either nitric or perchloric acid as catalyst. Optimum conditions were determined using different parameters such as reaction time, temperature, and component concentrations. Nitric acid catalyzed reactions resulted in maximum conversion ratio (96) at 50 °C, 1 h where ceric ion, acrylonitrile, xylan, and catalyst concentrations were 21.7 mmol l-1, 0.5 mol l -1, 0.2 (w/v), and 0.1 mol l-1, respectively. However, 83 conversion was obtained with perchloric acid catalysis at 27 °C, 1 h where concentrations were 5.4 mmol l-1, 0.8 mol l-1, 0.5 (w/v), and 0.2 mol l-1, respectively. Copolymer synthesis using perchloric acid was realized at milder conditions than using nitric acid. Thermal analyses of obtained polymers were conducted to characterize copolymers. Results showed that calculated activation energy, maximum degradation temperature, and heat of thermal decomposition changed relying mainly on molecular weight.

Original languageEnglish
Pages (from-to)1120-1126
Number of pages7
JournalCarbohydrate Polymers
Volume90
Issue number2
DOIs
Publication statusPublished - 1 Oct 2012

Keywords

  • Ceric ammonium nitrate
  • Graft copolymer
  • Polyacrylonitrile
  • Thermal characterization
  • Xylan

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