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


Paper Type 
 Short Communication
Title 
 Effect of Relative Humidity on MechanicalProperties of Blended Chitosan-Methylcellulose Film
Author 
 Pornchai Rachtanapun and Panchat Wongchaiya
Email 
 p.rachta@chiangmai.ac.th
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.
Start & End Page 
 133 - 137
Received Date 
 2010-09-28
Revised Date 
Accepted Date 
 2011-07-10
Full Text 
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Keyword 
 biopolymer, chitosan, methylcellulose, blended polymer film, relative humidity
Volume 
 Vol.39 No.1 (JANUARY 2012)
DOI 
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.
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