Enhanced thermal stability of poly(vinyl alcohol) in presence of melanin

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• 作者：Weifu Dong (1)
  Yang Wang (1)
  Chiguang Huang (1)
  Shuangfei Xiang (1)
  Piming Ma (1)
  Zhongbin Ni (1)
  Mingqing Chen (1)
  
• 关键词：Poly(vinyl alcohol) ; Thermal stability ; Degradation ; Melanin
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：115
• 期：2
• 页码：1661-1668
• 全文大小：565 KB
• 作者单位：Weifu Dong (1)
  Yang Wang (1)
  Chiguang Huang (1)
  Shuangfei Xiang (1)
  Piming Ma (1)
  Zhongbin Ni (1)
  Mingqing Chen (1)
  
  1. The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
  
• ISSN：1572-8943

文摘

A novel method was developed to enhance the thermal stability of PVA by using natural and synthetic melanins from oxidation of dopamine. Thermogravimetric (TG) curves indicated that the synthetic melanin changed the thermal degradation behaviors of PVA and largely improved the decomposed temperature by 80-10?°C in nitrogen when incorporation of synthetic melanin with low content (0.5- mass%). The thermal degradation kinetics suggested the activation energies of PVA/synthetic melanin blends were much higher than these of pure PVA. Isothermal TG curves conformed that the PVA/synthetic melanin blends exhibited more thermal stability than pure PVA. Moreover, the chemical structure changes of macromolecular after degradation were characterized by using fourier transform infrared and the results suggested that elimination reaction on the first degradation step did not took place for the PVA/synthetic melanin blends at 270?°C.