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Ferreira Q, Ribeiro PA, Oliveira ON, Raposo M. Long-term stability at high temperatures for birefringence in PAZO/PAH layer-by-layer films. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1470-1477. [PMID: 22335565 DOI: 10.1021/am201722x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Optical memories with long-term stability at high temperatures have long been pursued in azopolymers with photoinduced birefringence. In this study, we show that the residual birefringence in layer-by-layer (LbL) films made with poly[1-[4-(3-carboxy-4 hydroxyphenylazo)benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) alternated with poly(allylamine hydrochloride) (PAH) can be tuned by varying the extent of electrostatic interactions with film fabrication at different pHs for PAH. The dynamics of both writing and relaxation processes could be explained with a two-stage mechanism involving the orientation of the chromophores per se and the chain movement. Upon calculating the activation energies for these processes, we demonstrate semiquantitatively that reduced electrostatic interactions in films prepared at higher pH, for which PAH is less charged, are responsible for the longer stability at high temperatures. This is attributed to orientation of PAZO chromophores via cooperative aggregation, where the presence of counterions hindered relaxation.
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Affiliation(s)
- Quirina Ferreira
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa (FCT/UNL), 2829-516 Caparica, Portugal
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Dall'Agnol FF, Oliveira, ON, Giacometti JA. Influence from the Free Volume on the Photoinduced Birefringence in Azocompound-Containing Polymers. Macromolecules 2006. [DOI: 10.1021/ma052604z] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fernando F. Dall'Agnol
- Departamento de Física, Universidade Estadual do Centro Oeste (Unicentro), R. Simeão Camargo Varela de Sá, 03, Guarapuava, CP 3010 85040-080, Brazil; Instituto de Física de São Carlos, USP, CP 369, 13560-970, São Carlos, SP, Brazil; and Faculdade de Ciências e Tecnologia, UNESP, CP 467, 19060-900, Presidente Prudente, SP, Brazil
| | - O. N. Oliveira,
- Departamento de Física, Universidade Estadual do Centro Oeste (Unicentro), R. Simeão Camargo Varela de Sá, 03, Guarapuava, CP 3010 85040-080, Brazil; Instituto de Física de São Carlos, USP, CP 369, 13560-970, São Carlos, SP, Brazil; and Faculdade de Ciências e Tecnologia, UNESP, CP 467, 19060-900, Presidente Prudente, SP, Brazil
| | - José A. Giacometti
- Departamento de Física, Universidade Estadual do Centro Oeste (Unicentro), R. Simeão Camargo Varela de Sá, 03, Guarapuava, CP 3010 85040-080, Brazil; Instituto de Física de São Carlos, USP, CP 369, 13560-970, São Carlos, SP, Brazil; and Faculdade de Ciências e Tecnologia, UNESP, CP 467, 19060-900, Presidente Prudente, SP, Brazil
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8
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Tawa K, Kamada K, Kiyohara K, Ohta K, Yasumatsu D, Sekkat Z, Kawata S. Photoinduced Reorientation of Azo Dyes Bonded to Polyurethane Studied by Polarized FT-IR Spectroscopy. Macromolecules 2001. [DOI: 10.1021/ma002009r] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keiko Tawa
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Kenji Kamada
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Kenji Kiyohara
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Koji Ohta
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Daisuke Yasumatsu
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Zouheir Sekkat
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
| | - Satoshi Kawata
- The special division for Human Life Technology, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Fields and Reactions, PRESTO, JST, Japan; Institute of Photonics, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; and School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco
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