Permeability and Mechanical Properties of Zein and Gluten-Based Films

Zein과 Gluten 포장지의 수증기투과도와 기계적 특성

Permeability and mechanical properties of degradable films prepared with zein and gluten were measured. Tensile strength of zein-based films was ranged from 30.1 MPa to 138.5 MPa and the strength of gluten-based films was $37.1{\sim}98.6\;MPa$. This strength was increased with increase of thickness in both films. Water solubility of zein-based films, 1.3%, was lower than those of the gluten-based films and the cellulose-based films. The range of water vapor permeability was $0.0711{\sim}0.1778\;g\;mm/m^{2}\;hr\;mmHg$ for zein-based films and $0.2134{\sim}0.2972\;g\;mm/m^{2}\;hr\;mmHg$ for gluten-based films. The permeabilty of the films was also increased with thickness.

Zein과 gluten을 이용하여 시험제조한 분해성 포장지의 기능성을 조사하였다. Zein과 gluten 포장지의 인장강도는 각각 $30.1{\sim}138.5\;MPa$, $37.1{\sim}98.6\;MPa$ 범위를 나타냈으며 제조된 포장지의 두께가 두꺼워질수록 인장강도는 증가하였다. 용해도는 zein 포장지가 1.3%로서 gluten 포장지 및 셀룰로오스 포장지의 용해도에 비하여 상대적으로 낮게 나타났다. 한편, 수증기투과도는 zein 포장지의 경우 $0.0711{\sim}0.01778\;g\;mm/m^2\;hr\;mmHg$, gluten 포장지의 경우 $0.2134{\sim}0.2972\;g\;mm/m^{2}\;hr\;mmHg$였으며 인장강도와 마찬가지로 제조된 포장지의 두께가 두꺼워질수록 증가하였다.