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Phillips D. Time-resolved fluorescence of excimer-forming polymers in solution. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pi.4980190207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Buruiana EC, Jitaru F, Buruiana T, Olaru N. Polycinnamates and Block Co-polymers Prepared by Atom Transfer Radical Polymerization and Microwave Irradiation. Des Monomers Polym 2012. [DOI: 10.1163/138577210x12634696333398] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- E. C. Buruiana
- a Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Florentina Jitaru
- b Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Tinca Buruiana
- c Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - N. Olaru
- d Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania
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Thi TH, Matsusaki M, Hirano H, Kawano H, Agari Y, Akashi M. Mechanism of high thermal stability of commercial polyesters and polyethers conjugated with bio-based caffeic acid. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24752] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dong XM, Guo JB, Wei J. Photoreaction Behaviors of Two Liquid Crystalline Cinnamoyl Compounds with Different Phase in Solution and Mesomorphic States. CHINESE J CHEM PHYS 2010. [DOI: 10.1088/1674-0068/23/06/719-725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Jiao Y, Guo J, Dong X, Li R, Wei J. Kinetic analysis of solid-state photodimerization reaction of photosensitive monomers and a polymer with cinnamoyl moieties. J Appl Polym Sci 2010. [DOI: 10.1002/app.31890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Thi TH, Matsusaki M, Akashi M. Development of Photoreactive Degradable Branched Polyesters with High Thermal and Mechanical Properties. Biomacromolecules 2009; 10:766-72. [DOI: 10.1021/bm801203g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tran Hang Thi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan, and Faculty of Technology of Organic Chemistry, College of Chemistry, Ministry of Industry and Trade, Tien Kien, Lam Thao, Phu Tho, Vietnam
| | - Michiya Matsusaki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan, and Faculty of Technology of Organic Chemistry, College of Chemistry, Ministry of Industry and Trade, Tien Kien, Lam Thao, Phu Tho, Vietnam
| | - Mitsuru Akashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan, and Faculty of Technology of Organic Chemistry, College of Chemistry, Ministry of Industry and Trade, Tien Kien, Lam Thao, Phu Tho, Vietnam
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Chae B, Lee SW, Jung YM, Ree M, Kim SB. Two-dimensional correlation analysis study of the photo-induced molecular reorientations of photosensitive polyester film containing 1,4-phenylenediacryloyl units in the backbone. APPLIED SPECTROSCOPY 2008; 62:497-502. [PMID: 18498690 DOI: 10.1366/000370208784344361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The photochemical reaction and molecular reorientation of a novel photosensitive polyester, poly[oxy(4-n-butyl-3,5-benzoate)oxy-1,4-phenylenediacryloyl] (PPDA-C4BZ), which contains n-butyl side groups and 1,4-phenylenediacryloyl units (PDA chromophores) in the main chain, are reported in detail. We applied two-dimensional (2D) correlation analysis for the infrared (IR) and ultraviolet (UV) absorption spectra of nanoscaled films of PPDA-C4BZ to establish the sequence of the photo-induced segmental reorientations that result from UV irradiation. The photochemical reaction was found to have a greater effect on the polymer's main chains than on its side groups and to induce the reorientation of the polymer molecules. In particular, a cycloaddition process occurs first in the PDA chromophore units and then the local reorientation of the polymer molecules is induced. Namely, such photodimerization of the PDA chromophores induces the molecular reorientations of the PDA chromophores and the benzoate units in the main chain. The photo-induced molecular reorientations occur in the following sequence: photodimerization --> benzoate units --> PDA chromophores --> n-butyl side groups. In addition, a two-dimensional map of the first derivatives of the UV absorption spectra with respect to the exposure energy provided evidence of the formation of head-to-head aggregates (i.e., H-aggregates) of PPDA-C4BZ molecules.
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Affiliation(s)
- Boknam Chae
- Department of Chemistry, Laboratory for Vibrational Spectroscopy, National Research Lab for Polymer Synthesis and Physics, Polymer Research Institute, Pohang University of Science & Technology, Pohang, Republic of Korea
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Al-Ani KE, Akasheh T, Yousef YA. Decay Lifetimes of Para-Substituted Polystyrene in Solid Films and in Dichloromethane. INT J POLYM MATER PO 2007. [DOI: 10.1080/00914030600873519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Furumi S, Kidowaki M, Ogawa M, Nishiura Y, Ichimura K. Surface-Mediated Photoalignment of Discotic Liquid Crystals on Azobenzene Polymer Films. J Phys Chem B 2005; 109:9245-54. [PMID: 16852105 DOI: 10.1021/jp050106m] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes a simple strategy for the formation of photoaligned and micropatterned discotic liquid crystal (DLC) film on the surface of photoirradiated azobenzene-containing polymer thin film. The key material for the surface-mediated photoalignment of the DLCs was poly[4-(4-cyanophenylazo)phenyl methacrylate] (pMAzCN). Optical anisotropy was generated in a pMAzCN film by oblique exposure to nonpolarized light which resulted in angle-selective photoisomerization and reorientation of the azobenzenes. Subsequent annealing of the film at 240 degrees C enhanced the photoaligned state of the p-cyanoazobenzenes due to strong intermolecular dipole-dipole interaction and semicrystalline nature of the pMAzCN. This combination of photoirradiation and subsequent annealing of the pMAzCN film made it possible to realize the surface-assisted orientation control of a DLC molecule, which displays both columnar (Col) and discotic nematic (N(D)) phases over 152 degrees C. When the pMAzCN film was exposed to linearly polarized light from the surface normal, the DLC molecules showed homeotropic orientation with the director perpendicular to the substrate surface. In the contrast, oblique irradiation of the pMAzCN film with nonpolarized light gave rise to tilted DLC orientation with well-ordered optical birefringence at the N(D) phase. Rapid cooling from the N(D) phase produced a well-aligned glassy N(D) state at room temperature, which was adequately stable for 10 months even though no covalent cross-linking among the DLCs was performed. The spatial orientation of photoaligned DLCs in both their bulk film and in their interface region was characterized by means of optical birefringence, X-ray diffraction, and fluorescence measurements. At the N(D) phase, the DLC molecules were aligned in a hybrid manner such that their tilt angles varied throughout the thickness of DLC film. The direction of tilted DLCs was opposite to the propagation of the actinic nonpolarized light. The photoaligned DLC films exhibited polarized fluorescence emission with an s-polarized/p-polarized intensity ratio of 4.1, despite the nonpolarized excitation of only DLC at outmost surface. These results indicate that the three-dimensionally aligned azobenzene moieties of the pMAzCN thin film were transferred to the tilted DLC molecules at air/DLC interface. Finally, we demonstrated micrometer-scale photopatterned orientation of DLC molecules on the pMAzCN surface by oblique nonpolarized irradiation of the film through a photomask.
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Affiliation(s)
- Seiichi Furumi
- Materials Engineering Laboratory (MEL), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
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Gupta P, Trenor SR, Long TE, Wilkes GL. In Situ Photo-Cross-Linking of Cinnamate Functionalized Poly(methyl methacrylate-co-2-hydroxyethyl acrylate) Fibers during Electrospinning. Macromolecules 2004. [DOI: 10.1021/ma048844g] [Citation(s) in RCA: 128] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pankaj Gupta
- Departments of Chemical Engineering & Chemistry, Polymer Materials & Interfaces Laboratory, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
| | - Scott R. Trenor
- Departments of Chemical Engineering & Chemistry, Polymer Materials & Interfaces Laboratory, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
| | - Timothy E. Long
- Departments of Chemical Engineering & Chemistry, Polymer Materials & Interfaces Laboratory, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
| | - Garth L. Wilkes
- Departments of Chemical Engineering & Chemistry, Polymer Materials & Interfaces Laboratory, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
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Komatsu T, Sakuragi H, Nagasawa J, Nakanishi F. Photochemical behaviour of poly(vinyl alcohol) bearing p-phenylenediacrylate groups. POLYMER 1998. [DOI: 10.1016/s0032-3861(97)00520-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Rughooputh S, Phillips D, Bloor D, Ando D. Spectroscopic studies of polydiacetylene solutions and glasses. Glasses of a hydrogen-bonding polymer. Chem Phys Lett 1985. [DOI: 10.1016/0009-2614(85)85100-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Rughooputh S, Phillips D, Bloor D, Ando D. Spectroscopic studies of polydiacetylene solutions and glasses. Chem Phys Lett 1984. [DOI: 10.1016/0009-2614(84)80289-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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