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

Gamal El-Hiti,Ahmed Ahmed,Dina Ahmed,Basheer Hamad,Mohammad Alotaibi,Emad Yousif,Hassan Hashim

doi:10.3390/molecules24040803

Gamal El-Hiti, Ahmed Ahmed + Show 5 more

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https://doi.org/10.3390/molecules24040803

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Abstract

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.

Highlights

Plastics have unique chemical and physical properties and low production costs
We aim to report the synthesis of Schiff bases containing melamine as efficient Poly(vinyl chloride) (PVC) photostabilizers as part of our interest in the field of polymers [32,33,34,35,36,37,38,39]
Five Schiff bases containing melamine were utilized as photostabilizers for poly(vinyl chloride) films against irradiation with ultraviolet light

Summary

Introduction

Plastics have unique chemical and physical properties and low production costs. They are produced in huge quantities and are involved in various applications [1]. The chemical industry has come under severe pressure of late to overcome the problems created due to the use of plastics, such as the amount of waste generated, the nature of such waste, and their detrimental effect on the environment. One of the main concerns is how the properties of plastics may be improved for long term use [2]. Poly(vinyl chloride) (PVC) is a common and versatile thermoplastic that is utilized in daily applications ranging from food packaging to medical devices.

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