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Synthesis of methyldopa–tin complexes and their applicability as photostabilizers for the protection of polyvinyl chloride against photolysis

Naoom, Noor, Yousif, Emad, Ahmed, Dina S., Kariuki, Benson M. ORCID: https://orcid.org/0000-0002-8658-3897 and El-Hiti, Gamal A. ORCID: https://orcid.org/0000-0001-6675-3126 2022. Synthesis of methyldopa–tin complexes and their applicability as photostabilizers for the protection of polyvinyl chloride against photolysis. Polymers 14 (21) , 4590. 10.3390/polym14214590

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Abstract

Polyvinyl chloride (PVC) is a ubiquitous thermoplastic that is produced on an enormous industrial scale to meet growing global demand. PVC has many favorable properties and is used in various applications. However, photodecomposition occurs when harsh conditions, such as high temperatures in the presence of oxygen and moisture, are encountered. Thus, PVC is blended with additives to increase its resistance to deterioration caused by exposure to ultraviolet light. In the current research, five methyldopa–tin complexes were synthesized and characterized. The methyldopa–tin complexes were mixed with PVC at a concentration of 0.5% by weight, and thin films were produced. The capability of the complexes to protect PVC from irradiation was shown by a reduction in the formation of small residues containing alcohols, ketones, and alkenes, as well as in weight loss and in the molecular weight of irradiated polymeric blends. In addition, the use of the new additives significantly reduced the roughness factor of the irradiated films. The additives containing aromatic substituents (phenyl rings) were more effective compared to those comprising aliphatic substituents (butyl and methyl groups). Methyldopa–tin complexes have the ability to absorb radiation, coordinate with polymeric chains, and act as radical, peroxide, and hydrogen chloride scavengers.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Additional Information: License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Type: open-access
Publisher: MDPI
Date of First Compliant Deposit: 17 November 2022
Date of Acceptance: 27 October 2022
Last Modified: 17 Nov 2022 13:35
URI: https://orca.cardiff.ac.uk/id/eprint/154280

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