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Sava I, Hurduc N, Sacarescu L, Apostol I, Damian V. Study of the nanostructuration capacity of some azopolymers with rigid or flexible chains. HIGH PERFORM POLYM 2012. [DOI: 10.1177/0954008312454151] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Azobenzene polymers have been the subject of intensive research due to their unique and unexpected properties that allow various applications triggered by light. One of their attractive features is the possibility of changing the orientation of azobenzene chain through trans-cis-trans photoisomerization cycles to photoinduce birefringerence and linear dichroism in thin polymer films. The photochromic behavior and surface structuring capacity of rigid or flexible polymers having side azobenzene units have been investigated. The polyimides with side azobenzene units have rigid structure, while polysiloxane chains modified with azobenzene groups and nucleobases are considered materials with flexible structure. During the photochromic studies of the investigated polymers, a mechanism concerning the possibility to generate a fluid phase under UV/VIS irradiation was proposed. The photoisomerisation kinetic by UV-Vis irradiation in the solid state compared with the solution and the cis-trans azobenzene relaxation phenomena were presented. The surface structuring capacity of these polymers was studied using a Nd:YAG laser at 355 nm, at different incident fluencies and pulse numbers.
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Affiliation(s)
- Ion Sava
- Petru Poni Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda, Iasi, Romania
| | - Nicolae Hurduc
- Technical University Gheorghe Asachi, Department of Natural and Synthetic Polymers, Mangeron, Iasi, Romania
| | - Liviu Sacarescu
- Petru Poni Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda, Iasi, Romania
| | - Ileana Apostol
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor str, Bucharest-Magurele, Romania
| | - Victor Damian
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor str, Bucharest-Magurele, Romania
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Sava I, Sacarescu L, Stoica I, Apostol I, Damian V, Hurduc N. Photochromic properties of polyimide and polysiloxane azopolymers. POLYM INT 2008. [DOI: 10.1002/pi.2508] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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