Investigating the Water Reabsorption Kinetics of Modified BacterialCellulose by In-situ and Ex-situ Methods

The natural polymer obtained from Bacterial Cellulose (BC) has been studied and noticed as a newproduct due to its unique characteristics, including biocompatibility and biodegradability in medicaland cosmetic products. For better use of BC, some of its characteristics such as increased reabsorptionand flexibility were modified by in situ and ex situ modification methods. The purpose of this researchis to investigate the kinetic models of reabsorption of modified bacterial cellulose to be an alternativeto non-biodegradable commercial materials available in the market. The best BC sample modified byin situ method with Polyethylene glycol(PEG) and Glycerol was selected to reabsorb ۶.۹۸۱ times in۲۴ hours dried in an oven and ۲۵.۳۳ times reabsorbed dried in freeze dryer and to increase furtherreabsorption The optimized sample with in situ modification method with Citric acid(CA), PEG,disodium phosphate(Na۲HPO۴), sodium bicarbonate(NaHCO۳) materials reached reabsorption of۹.۳۸۴۶ times in ۲۴ hours and reabsorption of ۲۸.۶۴ times when dried in a freeze dryer. According tothe obtained results, the kinetic model was checked in the first two hours of reabsorption for theoptimal sample, i.e. BC sample modified by in-situ and ex-situ methods for both oven-dried andfreeze-dryer methods, and according to the correlation coefficient (R۲=۰.۹۹۷۴ and R۲=۰.۹۹۵۹ ovendriedand freeze-dried, respectively) first-order pseudo-Fickian diffusion kinetic model was selectedfor the optimal sample.

کلیدواژه ها:

Natural Polymer ، Bacterial cellulose composite ، kinetics ، in-situ and ex-situ modification