The Morphology and Performance of Poly(Vinyl Chloride) Containing Melamine Schiff Bases against Ultraviolet Light

Molecules

BasheerA. Hamad¹  Emad Yousif¹  AhmedA. Ahmed¹  DinaS. Ahmed²  GamalA. El-Hiti³  Hassan Hashim⁴  MohammadHayal Alotaibi⁵  Ahmed Ahmed⁶ 

[1]Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 64021, Iraq

[2]Department of Medical Instrumentation Engineering, Al-Mansour University College, Baghdad 64021, Iraq

[3]Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia

[4]Department of Physics, College of Science, Al-Nahrain University, Baghdad 64021, Iraq

[5]National Center for Petrochemicals Technology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia

[6]Polymer Research Unit, College of Science, Al-Mustansiriyah University, Baghdad 10052, Iraq

关键词: poly(vinyl chloride);    melamine;    Schiff bases;    ultraviolet irradiation;    carbonyl group index;    photostabilization;    weight loss;   

DOI  :  10.3390/molecules24040803

来源: DOAJ

【 摘 要 】

Five Schiff bases derived from melamine have been used as efficient additives to reduce the process of photodegradation of poly(vinyl chloride) films. The performance of Schiff bases has been investigated using various techniques. Poly(vinyl chloride) films containing Schiff bases were irradiated with ultraviolet light and any changes in their infrared spectra, weight, and the viscosity of their average molecular weight were investigated. In addition, the surface morphology of the films was inspected using a light microscope, atomic force microscopy, and a scanning electron micrograph. The additives enhanced the films resistance against irradiation and the polymeric surface was much smoother in the presence of the Schiff bases compared with the blank film. Schiff bases containing an ortho-hydroxyl group on the aryl rings showed the greatest photostabilization effect, which may possibly have been due to the direct absorption of ultraviolet light. This phenomenon seems to involve the transfer of a proton as well as several intersystem crossing processes.

【 授权许可】

Unknown