明胶-壳聚糖共混复合膜的逾渗研究
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摘要
为探讨明胶-壳聚糖复合膜的性能,确定复合体系的逾渗阈值,为生产实践提供依据。试验以共混的方法制备了明胶-壳聚糖复合膜,测定了壳聚糖质量分数不同(0～21%)时复合膜的抗拉强度(2.3～12.5 MPa)、断裂伸长率(203.1%～108.2%)和热缩性(3.7%～1.9%)。当添加壳聚糖到一定量时,复合膜的抗拉强度、断裂伸长率和热缩性均发生突变。结果表明,明胶-壳聚糖共混复合膜存在逾渗现象,逾渗阈值为壳聚糖质量分数约15%。
Gelatin/chitosan composite membranes were prepared by blending method. The tensile strength(2.3-12.5 MPa),elongation at break(203.1%-108.2%) and heat shrinkability(3.7%-1.9%) of the composite films with different mass fraction of chitosan(0-21%) were determined. It is found that, the tensile strength, elongation at break and thermal shrinkage value of the composite films changed abruptly at same time when the chitosan was added to a certain amount. The results show that there is a percolation phenomenon in the blend membrane of gelatin/chitosan, and the percolation threshold is mass fraction of chitosan about 15%.
Gelatin/chitosan composite membranes were prepared by blending method. The tensile strength(2.3-12.5 MPa),elongation at break(203.1%-108.2%) and heat shrinkability(3.7%-1.9%) of the composite films with different mass fraction of chitosan(0-21%) were determined. It is found that, the tensile strength, elongation at break and thermal shrinkage value of the composite films changed abruptly at same time when the chitosan was added to a certain amount. The results show that there is a percolation phenomenon in the blend membrane of gelatin/chitosan, and the percolation threshold is mass fraction of chitosan about 15%.
引文
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[2]VIGOLOB,COULONC,MAUGEYM,etal.An experimental approach to the percolation of sticky nanotubes[J].Science, 2015, 309(5736):920.
[3] SABERI A A. Percolation description of the global topography of earth and the moon[J]. Physical Review Letters, 2013,110(17):2368-2373.
[4] KALISKY T, COHEN R. Width of percolation transition in complex networks[J]. Physical Review E Statistical Nonlinear&Soft Matter Physics, 2006, 73(2):80-98.
[5] CARDY J. Turbulence:The power of two dimensions[J].Nature Physics, 2006, 2(2):67-68.
[6] DOTSENKO V S, WINDEY P, HARRIS G, et al. Critical and topological properties of cluster boundaries in the 3D model[J]. Physical Review Letters, 1993, 71(6):811.
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[14]孙昌梅,曲荣君,王春华.基于壳聚糖及其衍生物的金属离子吸附剂的研究进展[J].离子交换与吸附, 2004, 20(2):184-186.
[15]陈水平,汪玉庭.壳聚糖多孔微球负载PdCl2选择性催化氢化氯代硝基苯的研究[J].功能高分子学报, 2003, 16(1):6212-6216.
[16]杨帅帅,李海朝,黄丽娟.增塑剂改性明胶膜的制备与表征[J].食品工业科技, 2017(21):84-87.