Synthesis of New Thiophene Derivatives and Their Use as Photostabilizers for Rigid Poly(vinyl chloride)
Joint Authors
El-Hiti, Gamal A.
Yousif, Emad
Balakit, Asim A.
Ahmed, Ahmed
Smith, Keith
Source
International Journal of Polymer Science
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-01-13
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Five new thiophenes, namely, N-[(3-bromo-2-methylthiophen-5-yl)methylene]-4-methoxyaniline (4a), N-[(3-bromo-2-methylthiophen-5-yl)methylene]-3,4-dimethoxyaniline (4b), N-[(3-bromo-2-methylthiophen-5-yl)methylene]-3,4-dimethylaniline (4c), 3-[(3-bromo-2-methylthiophen-5-yl)methyleneamino]-2-methylquinazolin-4(3H)-one (4d), and 3-[(3-bromo-2-methylthiophen-5-yl)methyleneamino]-2-isopropylquinazolin-4(3H)-one (4e), have been synthesized.
All of these materials brought about a reduction in the level of photodegradation of poly(vinyl chloride) (PVC) films containing the synthesized thiophenes (0.5%; by weight).
The results obtained showed that the extent of photostabilization of PVC in the presence of an additive was in the order 4e > 4d > 4b > 4a > 4c.
For the most favorable additive (4e), the rate of appearance of infrared absorption bands of degradation products was reduced by around two-thirds, while the quantum yield of chain scission was calculated to be reduced by a factor of more than one thousand.
It is suggested that the additives may help stabilize PVC by direct absorption of UV radiation and dissipation of the energy as heat or that electrostatic attraction between the additives and PVC may assist transfer of energy from excited state PVC to the additive, from where it can be dissipated.
American Psychological Association (APA)
Balakit, Asim A.& Ahmed, Ahmed& El-Hiti, Gamal A.& Smith, Keith& Yousif, Emad. 2015. Synthesis of New Thiophene Derivatives and Their Use as Photostabilizers for Rigid Poly(vinyl chloride). International Journal of Polymer Science،Vol. 2015, no. 2015, pp.1-10.
https://search.emarefa.net/detail/BIM-1066790
Modern Language Association (MLA)
Balakit, Asim A.…[et al.]. Synthesis of New Thiophene Derivatives and Their Use as Photostabilizers for Rigid Poly(vinyl chloride). International Journal of Polymer Science No. 2015 (2015), pp.1-10.
https://search.emarefa.net/detail/BIM-1066790
American Medical Association (AMA)
Balakit, Asim A.& Ahmed, Ahmed& El-Hiti, Gamal A.& Smith, Keith& Yousif, Emad. Synthesis of New Thiophene Derivatives and Their Use as Photostabilizers for Rigid Poly(vinyl chloride). International Journal of Polymer Science. 2015. Vol. 2015, no. 2015, pp.1-10.
https://search.emarefa.net/detail/BIM-1066790
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1066790