羟（甲、乙、丙）基纤维素/明胶共混复合膜的制备和性能研究

Preparation and Properties of HMC, HEC, and HPC/Gelatin Composite Membrane

中文关键词:  明胶  纤维素  共混复合膜  力学性能  热稳定性

Key Words:gelatin  cellulose  blend membrane  mechanical properties  thermal stability

中文摘要:

      以明胶为基体，甘油为增塑剂，羟甲基纤维素（HMC）、羟乙基纤维素（HEC）、羟丙基纤维素（HPC）分别为增强相，通过添加不同量的羟（甲、乙、丙）基纤维素，分别制备不同含量的羟（甲、乙、丙）基纤维素/明胶共混复合膜；采用扫描电子显微镜、智能电子拉力试验机、差示扫描量热仪和热缩试验仪对共混复合膜的表面形貌、力学性能和热稳定性进行表征。结果表明，随着共混复合膜中纤维素含量的增加，各复合膜的断裂伸长率和抗拉强度呈先提高后降低的趋势 ；达到最大抗拉强度时，各共混复合膜中羟基纤维素的含量分别为HMC 1%（38.4 MPa）、HEC 1%（35.3 MPa）、HPC 0.5%（32.1 MPa）；各共混复合膜热稳定性均提高，而热缩率降低。添加羟基纤维素可增强共混复合膜的力学性能和热稳定性，但不同羟基纤维素作为增强相时，增强效果存在一定差距。

Abstract:

      The gelatin composite membrane was prepared by blending method using gelatin as basis material， glycerinum as plasticizer and reinforcing with hydroxymethyl cellulose （HMC） or hydroxyethyl cellulose （HEC） or hydropropyl cellulose （HPC）. Scanning electron microscope （SEM）， intelligent electronic tensile testing machine， thermal differential scanning instrument and temperature retraction apparatus were used to characterize the prepared composite membranes. The results indicated that the elongation at break and tensile strength of composite membranes tended to increase at first and then decrease with the increasing of cellulose content. The composite membranes had the optimum tensile strength when the cellusose contents were 1% （HMC， 38.4 MPa）， 1% （HEC， 35.3 MPa） and 0.5% （HPC， 32.1 MPa）， respectively. The thermal stability of the composite membranes was improved and the heat shrinkable rate decreased. The addition of cellulose enhanced the mechanical properties and thermal stability of composite membranes， however different cellulose had certain difference in reinforcing efficiency.