Investigation and modeling of moisture sorption behaviour of rice starch/carboxymethyl chitosan blend films

2015 Global Conference on Polymer and Composite Materials

材料科学;化学

Suriyatem, R.^1 ; Rachtanapun, C.^2 ; Raviyan, P.^1 ; Intipunya, P.^1 ; Rachtanapun, P.^3

Division of Food Science and Technology, Chiang Mai University, Chiang Mai

50100, Thailand^1

Department of Food Science and Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok

10900, Thailand^2

Division of Packaging Technology, Chiang Mai University, Chiang Mai

50100, Thailand^3

关键词: Brunauer emmett tellers;    Carboxymethyl chitosan (CMCH);    Equilibrium moisture contents;    Moisture sorption;    Moisture sorption isotherms;    Sorption isotherms;    Water barrier properties;    Water vapor permeability;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/87/1/012080/pdf
DOI  :  10.1088/1757-899X/87/1/012080

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The biopolymer films from rice starch (RS) and carboxymethyl chitosan (CMCh) were developed by solution casting. The effect of the ratios of rice starch to CMCh (100:0, 88:12, 67:33, 50:50, 33:67, 12:88 and 0:100) on water barrier properties and moisture sorption isotherm of blend films was studied. Water vapor permeability of rice starch film and CMCh film were 4.8 and 9.1 g.mm/m2.mHg.day, respectively, while those of the RS/CMCh blend films ranged between 5.0 and 9.1 g.mm/m2.mHg.day. The sorption isotherm of RS/CMCh blend films was determined at 25°C. The sorption behaviour of RS/CMCh blend films could be categorized as type II and type III isotherms. The highest equilibrium moisture content (63.5 g water/100 g dry solid) was obtained in the CMCh film at awof 0.87. For further application of sorption isotherm data, the moisture sorption characteristic of the films can be predicted using empirical models. Lewicki, Peleg, Guggenheim-Anderson-deBoer (GAB), Brunauer-Emmett-Teller (BET), and Oswin models were tested to fit the experimental data. The Peleg equation showed the best fit to the experimental data of the RS/CMCh blend films with r2∼ 0.997 and the lowest % RMS of 6.2-44.3.