Studies on the Physical and Thermal Properties of the Chitosan/Gelatin Blend

키토산/젤라틴 블랜드 폴리머의 물리적 및 열적 특성에 대한 연구

  • Kim, Byung-Ho (Department of Food and Biotechnology, and Food and Bio-industrial Research Center, Hankyong National University) ;
  • Park, Jang-Woo (Department of Food and Biotechnology, and Food and Bio-industrial Research Center, Hankyong National University)
  • 김병호 (국립한경대학교 식품생물공학과 및 식품생물산업연구소) ;
  • 박장우 (국립한경대학교 식품생물공학과 및 식품생물산업연구소)
  • Published : 2005.02.28


To mass-produce useful biopolymer films, chitosan/gelatin blend films were prepared by solution casting method. Effects of mixing ratio, tensile strength (TS), elongation (E) at break, total color difference (${\Dalta}E$), opacity, water vapor permeability (WVP), oxygen permeability (OP), and thermal properties on chitosan/gelatin blend films properties were investigated. TS, E, ${\Dalta}E$, opacity, WVP, and OP values were 58.24-22.01 MPa, 13.11-24.67%, 1.86-17.45, 0.3104-1.2161 nmO.D./${\mu}m$, $1.6875-1.7225ng{\cdot}m/m^{2}{\cdot}s{\cdot}Pa$, and $2.2380{\times}10^{-7}-2.2975{\times}10^{-7}\;mL{\cdot}{\mu}m/m^{2}{\cdot}s{\cdot}Pa$, respectively. TS of blend films decreased, while E, ${\Dalta}E$, and opacity increased with increasing chitosan content. WVP of blend films did not show any significant relationship with mixing ratio and thickness of blend films. Miscibility of films was examined over entire composition range by thermogravimetric analyzer (TGA) and dynamic mechanical analyzer (DMA). TGA results showed gelatin is more thermally stable than chitosan and some interactions among functional groups of two biopolymers. Glass transition temperature $(T_{2})$ of films as determined by DMA decreased with increasing content of chitosan in the blend. Results of thermal analysis indicate high miscibility among polymer components in the blend.


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