Thermal Stability and Degradation of Chitosan Modified by Cinnamic Acid

• 作者: Adel Zak El-Sonbati Dina Mohamed Diaa Bader Mohamed Mohamed Al-Halawany Mostafa Amin Diab
• 来源期刊: 高分子化学期刊(英文)
• 学科: 化学
• 关键词: N-Cinnamoyl CHITOSAN Preparation THERMAL STABILITY and DEGRADATION Mechanism of DEGRADATION
• 年，卷（期）: 2012,（1）
• 页码范围: 14-20
• 页数: 7页
• 分类号: O6

摘要

The reaction of chitosan with cinnamic acid gave the corresponding N-cinnamoyl chitosan (NCC) polymer. The chem-ical structure of the modified polymer was characterized by IR, 1H-NMR and elemental analysis. Thermogravim- etric analysis reveals that the thermal stability of chitosan polymer is greater than NCC polymer. The activation energies of thermal degradation of chitosan and NCC polymers were determined using Arrhenius relationship. Thermal degradation of NCC polymer was studied and the products of degradation were identified by GC-MS technique. It seems that the mechanism of degradation of NCC polymer is characterized by elimination of low-molecular weight radicals. Combination of these radicals and random scission mechanism along the backbone chain are the main source of the degradation products.