Synthesis and photochemical properties of novel pentamethylated norbornadiene containing polyimides
Identifieur interne : 000080 ( France/Analysis ); précédent : 000079; suivant : 000081Synthesis and photochemical properties of novel pentamethylated norbornadiene containing polyimides
Auteurs : Ahmed Oueslati [Tunisie] ; Hatem Ben Romdhane [Tunisie] ; Vincent Martin [France] ; Fréderic Schiets [France] ; Régis Mercier [France] ; Refaât Chaâbouni [Tunisie]Source :
- Journal of Polymer Science Part A: Polymer Chemistry [ 0887-624X ] ; 2011-05-01.
English descriptors
- KwdEn :
Abstract
A novel pentamethylated norbornadiene (NBD) based dianhydride, α,α′‐bis‐(3,4,5,6,7‐pentamethylcyclopenta‐2,4‐dienyl)meta‐xylene‐1,2‐dianhydride (3), was prepared from α,α′‐bis‐(pentamethylcyclopentadienyl)meta‐xylene (1) and acetylene dicarboxylic acid. The bis‐adduct formed via Diels–Alder reaction afforded tetra‐acid (2), which was chemically cyclodehydrated to lead the targeted dianhydride (3). New polyimides containing NBD moieties in the main chain were prepared from the dianhydride monomer (3) and various aromatic diamines. The chemical structure of the polymers was confirmed by both 1H and 13C NMR analysis. Their Molecular weights were also measured by SEC. All of these polyimides are soluble at room temperature in common organic solvents, such as chloroform, dichloromethane, THF, DMSO, DMF, and NMP, and show good thermal stabilities. The photochemical isomerization of the NBD into quadricyclane (QC) was investigated by UV/vis spectrophotometry from polymer films using visible sunlight as irradiation source. It was found that the kinetic rate of the conversion NBD‐QC which proceeded smoothly is a first kinetic order. The stored energies released by the transformation of QC groups into NBD ones of the irradiated polymer films were also evaluated by DSC measurement and were found to be around 90 kJ mol−1. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Url:
DOI: 10.1002/pola.24626
Affiliations:
- France, Tunisie
- Auvergne-Rhône-Alpes, Gouvernorat de Tunis, Rhône-Alpes
- Solaize, Tunis
- Université de Tunis - El Manar
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ISTEX:039BCCA6650FDBCF267F94BBCB4E4B85943576F4Le document en format XML
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The stored energies released by the transformation of QC groups into NBD ones of the irradiated polymer films were also evaluated by DSC measurement and were found to be around 90 kJ mol−1. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Gouvernorat de Tunis</li><li>Rhône-Alpes</li></region><settlement><li>Solaize</li><li>Tunis</li></settlement><orgName><li>Université de Tunis - El Manar</li></orgName></list><tree><country name="Tunisie"><noRegion><name sortKey="Oueslati, Ahmed" sort="Oueslati, Ahmed" uniqKey="Oueslati A" first="Ahmed" last="Oueslati">Ahmed Oueslati</name></noRegion><name sortKey="Ben Romdhane, Hatem" sort="Ben Romdhane, Hatem" uniqKey="Ben Romdhane H" first="Hatem" last="Ben Romdhane">Hatem Ben Romdhane</name><name sortKey="Chaabouni, Refaat" sort="Chaabouni, Refaat" uniqKey="Chaabouni R" first="Refaât" last="Chaâbouni">Refaât Chaâbouni</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Martin, Vincent" sort="Martin, Vincent" uniqKey="Martin V" first="Vincent" last="Martin">Vincent Martin</name></region><name sortKey="Mercier, Regis" sort="Mercier, Regis" uniqKey="Mercier R" first="Régis" last="Mercier">Régis Mercier</name><name sortKey="Schiets, Frederic" sort="Schiets, Frederic" uniqKey="Schiets F" first="Fréderic" last="Schiets">Fréderic Schiets</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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