Structure and Thermomechanical Properties of Stretched Cellulose Films

作者：Kim Jae Woo; Park Sunkyu^*; Harper David P; Rials Timothy G

来源：Journal of Applied Polymer Science, 2013, 128(1): 181-187.

DOI：10.1002/app.38149

• cellulose
• stretching
• orientation
• thermomechanical properties
• alpha-relaxation

Regenerated and stretched cellulose films were investigated for structure and thermomechanical properties as a potential packaging material. Cellulose films were cast from lithium chloride/N, N-dimethylacetamide and were stretched up to 30% in a dynamic mechanical analyzer sample holder. Wide-angle X-ray diffraction analysis indicated that the orientation factor was significantly increased due to stretching. In addition, the stretched films have a higher resistance to the thermal decomposition from thermo gravimetric analysis. The increased orientation of cellulose crystalline structure by the stretching process also increased the storage modulus of cellulose films characterized by dynamic mechanical analysis, which suggest that mechanical properties of cellulose films could be tuned during the stretching process. The alpha(2)and alpha(1) relaxations were found at 240 and 300 degrees C, respectively, which are attributed to the micro-Brownian motion of segments in amorphous region, and activation energies for relaxations were determined with the stretching levels.

• 出版日期2013-4-5