Improvement of physical properties of crosslinked alginate and carboxymethyl konjac glucomannan blend films

Chaobo Xiao, Lihui Weng, Lina Zhang

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Blend films from carboxymethyl konjac glucomannan and sodium alginate in different ratios were prepared by blending 4 wt % sodium alginate aqueous solution with 2 wt % konjac glucomannan aqueous solution. After crosslinking with 5 wt % calcium chloride aqueous solution, the blend films formed a structure of semi-interpenetrating networks. The structure and physical properties of both uncrosslinked and crosslinked films were characterized by Fourier transformed infrared spectra (FTIR), differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and tensile tests. The results indicated that the mechanical properties and the thermal stability of the films were improved by blending sodium alginate with carboxymethyl konjac glucomannan due to the intermolecular hydrogen bonds between sodium alginate and carboxymethyl konjac glucomannan. The crosslinked blend films with Ca2+, compared with uncrosslinked blend films, exhibited further improved physical properties due to the formation of a semi-IPN structure. Furthermore, the degree of swelling of the crosslinked films was also investigated.

Original languageEnglish (US)
Pages (from-to)2554-2560
Number of pages7
JournalJournal of Applied Polymer Science
Volume84
Issue number13
DOIs
StatePublished - Jun 24 2002

Keywords

  • Blend films
  • Carboxymethyl konjac glucomannan
  • Crosslinking
  • Sodium alginate

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