การศึกษาการเตรียมและวิเคราะห์สมบัติของฟิลม์ผสมของเฮกซะโนอิลไคโตซานและพอลิแลคไทค์ : รายงานผลการวิจัย

• 主要作者: รัตนา รุจิรวนิช
• 格式: Research Report
• 語言: Thai
• 出版: จุฬาลงกรณ์มหาวิทยาลัย 2005
• 主題: ฟิล์มพลาสติก; โพลิเมอร์; ไคโตแซน
• 在線閱讀: https://digiverse.chula.ac.th/Info/item/dc:15172
• 機構: Chulalongkorn University

Hexanoyl chitosan (H-chitosan) was synthesized to obtain the organic solvent soluble chitosan derivatives. H-chitosan was synthesized directly by repeating reachted chitosan with hexanoyl chloride in the mixture of anhydrous pyridine and chloroform to obtain products with various degrees of hexanoylation [Degree of substitution = 2.06, 3.78, 3.91 and 3.92 for the number of repeated reaction = 1, 2, 3 and 4, respectively]. The chemical structures of hexanoyl chitosan were characterized by FT-IR, H-NMR, and elemental analysis. The obtained H-chitosan exhibited much improvement in the solubility in organic solvents such as chloroform, dichloromethane and tetrahydrofuran. Thermal analysis results indicated lower thermal stability of H-chitosan than that of chitosan. WAXD indicated that lower packing of chitosan main chains in H-chitosan. The thermal stability and crystallinity of H-chitosan were lower than those of chitosan due to the loss of intra- and inter-molecular hydrogen bonds and large substituents group resulting in poor packing of H-chitosan main chains. Blend films of H-chitosan and polylactide (PLA) were prepared by the solution-casting technique from the corresponding blend solutions in chloroform. TGA, DSC, SEM, and WAXD results indicated that the blend products exhibited partial miscibility between H-chitosan and PLA molecules in the amorphous phase at low H-chitosan contents (i.e. [is less than or equal to] 40 wt.%) and became more immiscible when H-chitosan content increased. As proved by constancy of melting temperature and the observation of phase separation. The enzymatic degradation of the blend films was also studied. It was concluded form this study that proteinase K highly degraded H-chitosan/PLA blend films, while lysozyme an lipase had little or no affects on the degradation of the blend films.