期刊
CELLULOSE
卷 20, 期 1, 页码 453-465出版社
SPRINGER
DOI: 10.1007/s10570-012-9802-5
关键词
Sisal; Cellulose acetates films; Cellulose chains, auto-organization; One-pot process
资金
- FAPESP (The State of Sao Paulo Research Foundation, Brazil)
- CNPq (National Research Council, Brazil)
This study was undertaken to evaluate both the properties of cellulose acetate films as a function of their degree of substitution (DS) and the possibility of generating reinforcements during film preparation. Sisal was selected for the entire study, among other reasons, because it is a rapidly growing source of cellulose. Cellulose acetates with various DS values were prepared in a homogeneous medium (dimethylacetamide/lithium chloride as the solvent system) and characterized. In DMAc/LiCl, cellulose and cellulose acetate films (mixed or not mixed with sisal cellulose) were successfully prepared and characterized. The films with high DS values exhibited lower hygroscopicity, a distinct morphology (scanning electron microscopy images), and lower tensile strength. In some cases, the films prepared from acetates/cellulose exhibited higher tensile strength and/or storage modulus than the acetate films. This result suggested a reinforcing action of the auto-organized cellulose chains that enabled the generation of both a film and reinforcement in a one-pot process.
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