DSC and FTIR studies on gellan and polyvinyl alcohol (PVA) blend films.

Sudhamani, S. R. and Prasad, M. S. and Udaya Sankar, K. (2003) DSC and FTIR studies on gellan and polyvinyl alcohol (PVA) blend films. Food Hydrocolloids, 17 (3). pp. 245-250.

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Abstract

A series of gellan/polyvinyl alcohol (PVA) composite cast films of 90-100 mum was prepared by varying gellan content from 33 to 100%, using water as solvent and glycerol as plasticizer. Homopolymer films were also prepared. Films were characterized for thermal properties, intermolecular interactions and mechanical properties. DSC thermograms showed single glass transitions for blended films and melt isotherms shifted towards higher temp. as level of PVA in blends increased. A shift in major signals of IR for OH absorption and varied intensities in FTIR spectra indicated molecular interaction and cross-linking of polymers. Blended films exhibited tensile strength values of 3.5-5.6 MPa and tear strength values of 15-30 g. Percentage elongation at breakage was highest in 1:3 blends of gellan:PVA.

Item Type:	Article
Uncontrolled Keywords:	ANALYTICAL-TECHNIQUES; FILMS-; MECHANICAL-PROPERTIES; MIXING-; PLASTICS-; POLYSACCHARIDES-; SPECTROSCOPY-; BLENDING-; DSC-; FTIR-SPECTROSCOPY; GELLAN-; POLYVINYL-ALCOHOL
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 05 Calorimetric Analysis 600 Technology > 05 Chemical engineering > 08 Plastics Technology
Divisions:	Food Engineering Food Microbiology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	19 Aug 2008 11:30
Last Modified:	30 May 2012 10:55
URI:	http://ir.cftri.res.in/id/eprint/7582

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