Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Effect of Relative Humidity on MechanicalProperties of Blended Chitosan-Methylcellulose Film

Pornchai Rachtanapun and Panchat Wongchaiya
* Author for corresponding; e-mail address: p.rachta@chiangmai.ac.th
Volume: Vol.39 No.1 (JANUARY 2012)
Short Communication
DOI:
Received: 28 September 2010, Revised: -, Accepted: 10 July 2011, Published: -

Citation: Rachtanapun P. and Wongchaiya P., Effect of Relative Humidity on MechanicalProperties of Blended Chitosan-Methylcellulose Film, Chiang Mai Journal of Science, 2012; 39(1): 133-137.

Abstract

The  effects  of  relative  humidity (RH)  on  the  mechanical  properties  of  polymer  films  obtained  by  blending  of  chitosan-methylcellulose  were  investigated. The  film  samples  were  conditioned  at  various % RH  for  at  least  48 h  and  then  the  mechanical  properties  were  analyzed. The  blended  film  achieved  an  optimum  tensile  strength (20.86 mPa) at  45.9% RH  and  elongation  at  break (52.4%) at  76.2% RH. Thermal  properties  and  morphologies  of  the  blended  films  were  also  studied. Melting  points  of the  chitosan  and  methylcellulose  films  as  examined  by  differential  scanning  calorimetry (DSC)  were  115°C  and  118°C, respectively. After  blending  of  chitosan and  methylcellulose  the  melting  point  of  the  blended  film  was  lower  than  that  of  the  individual film  and  the  blended  film  had  only  one  peak  at  110°C. This  phenomenon  shows  that  the  blended  chitosan-methylcellulose  film  forms  a  homogeneous  mixture. Scanning  electron  microscopy (SEM)  was  used  to  characterize  the  morphology  of  the  films. SEM  images  confirmed  the  homogeneous  nature  of  the  blended  films.

Keywords: biopolymer, chitosan, methylcellulose, blended polymer film, relative humidity

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