温度对石墨/明胶共混复合膜性能的影响

Effect of Temperature on Properties of Graphite / Gelatin Functional Membrane

摘要:

以明胶为基体，甘油为增塑剂，石墨为增强相，制备易溶解的生物大分子功能性复合膜，通过共混的方法制备一系列的石墨/明胶复合膜，并测试复合膜在不同温度下各浓度复合膜的抗拉强度、断裂伸长率、吸水性、水蒸气透过率、SEM等的性能来判断膜的性能。抗拉强度整体趋势随着石墨含量的增加呈现为先增加后减小的趋势，在35 ℃（抗拉强度范围在49 MPa~85 MPa）和-10 ℃（23 MPa~40 MPa）时较大但断裂伸长率较低，35 ℃（断裂伸长率范围在13%~34%）和-10 ℃（5%~55%）；断裂伸长率趋势随着石墨含量的增加先增加后减少的趋势，在10 ℃（70%~112%）和0 ℃（48%~110%）时较好，但抗拉强度在10 ℃（6 MPa~10 MPa）和0 ℃（0.5 MPa~6 MPa）时较差；吸水性中随着温度的升高，空白样的吸水率受温度影响增加最快，同温度下随着石墨含量的增加吸水率降低，吸水率起到了抑制的作用；温度越高WVP越大，少量石墨加入（0.5%、3%、5%）对WVP有利；水溶性：35 ℃>25 ℃>5 ℃>15 ℃，高温有利于溶解，低温有利有疏水保护层的形成。

Abstract:

Gelatin/chitin composite membranes were prepared by blending method. Tensile strength, elongation at break, water adsorption, WVP and SEM were used to characterize the samples prepared in different temperature. The results indicated that the tensile strength increased firstly and then decreased with graphite content increased. The tensile strength of the samples prepared at 35 ℃ (49 MPa~85 MPa) and -10 ℃ (23 MPa~40 MPa) were better than others. The elongation at break increased firstly and then decreased with graphite content increasing. The elongation at break of the samples prepared at 10 ℃ (70%~112%) and 0 ℃ (48%~110%) were better than others. The water absorption rate of the control sample increased faster than others. The water adsorption rate decreased with graphite content increased at the same temperature. WVP increased with temperature. For WVP, the graphite concentrations（0.5%、3%、5%）were better than others. For water solubility, the order of the temperature was 35 ℃ >25 ℃ >5 ℃ >15 ℃.