Synthesis and properties of two kinds of nonlinear optical interpenetrating polymer networks

Xie, Hongfeng; Huang, Xu-Dong; Guo, Jun‐Shi

doi:10.1002/(sici)1097-4628(19960425)60:4<537::aid-app7>3.0.co;2-p

“…Such distortions lead to a decrease of the intramolecular charge transfer upon excitation that explains the increase of the electron transition energy and the hypsochromic shift of the absorption band. This spectral behaviour is consistent with spectral phenomena observed in other crosslinked polymer systems 18,19 .…”

Section: Spectral Properties Of P-na and Dgeba-p-na In Crosslinked Nesupporting

confidence: 90%

“…The relaxation behaviour of the secondorder NLO properties of the polymers films were studied by monitoring the decay of the order parameter (Φ) as a function of time at 25 °C. The order parameter can be calculated according to equation 18 :…”

Section: Second-order Nlo Properties and Temporal Stability Of The Pomentioning

confidence: 99%

Second-Order Polarizability and Temporal Stability of Epoxy Polymers Doped with Chromophore and with Chromophore Moieties in the Main Chain

Mishurov

¹

,

Roshal

²

,

Brovko

³

2015

Polymers and Polymer Composites

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Second-order nonlinear optical (NLO) properties and temporary stability of epoxy polymers based on diglycidyl ether of bisphenol A (DGEBA) both doped with p-nitroaniline (p-NA) and functionalized linear polymer DGEBA with p-NA moieties (attached to the bearing main chain) in the main chain (DGEBA-p-NA) have been investigated. Second-order polarizabilities of both p-NA and functionalized linear polymer DGEBA-p-NA were determined by a solvatochromic method. It was shown that this method could be successfully applied to determine the molecular second-order polarizabilities of both low-molecular mass chromophores and polymers with chromophore moieties attached to the chains. The relaxation behaviour of the doped and functionalized poled epoxy polymers has been studied. The crosslinked functionalized polymer DGEBA-p-NA exhibits the highest second-order NLO properties and temporal stability.

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“…In an azocarbazole-based polyimide, 10 the remnant of birefringence is very stable at about 97%, even after annealing at 240°C for 1 h. However, crosslinking has been investigated to enhance the stability of the nonlinear optical (NLO) properties. Crosslinking with sol-gel, 14,15 thermal or photochemical, 16 -20 or interpenetrating polymer networks [21][22][23][24] has already been carried out with poling in an electric field. The second harmonic generation coefficient of the poled crosslinked NLO polymers containing azobenzene has been main-tained for a long term even at high temperatures after the electric field has been removed.…”

Section: Introductionmentioning

confidence: 99%

Effect of crosslinking on the photoinduced orientation of azo groups in thin polymer films

Takase¹,

Natansohn²,

Rochon³

2001

J. Polym. Sci. B Polym. Phys.

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A series of amorphous copolymers containing disperse red 1 and crosslinkable acrylic groups were prepared. The crosslinked polymers were prepared in thin films by thermal polymerization of the acrylic groups in the copolymers. The orientation induced by irradiation with a linearly polarized laser was measured as birefringence at several temperatures, and the effect of crosslinking on the photoinduced orientation was investigated. Crosslinking enhanced the stability of the photoinduced birefringence. In particular, crosslinking helped to maintain the birefringence both at high temperatures and after the linearly polarized laser was turned off. The birefringence dynamics was analyzed with biexponential curve fitting. Crosslinking influenced not only the birefringence levels but also its rate of growth. The growth rate of the photoinduced birefringence decreased by crosslinking, whereas the relaxation was not significantly affected. Although crosslinking restrained the mobility of the azo chromophores, a certain fraction could orient or move randomly even in highly crosslinked polymer networks.

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“…In an azocarbazole‐based polyimide,10 the remnant of birefringence is very stable at about 97%, even after annealing at 240 °C for 1 h. However, crosslinking has been investigated to enhance the stability of the nonlinear optical (NLO) properties. Crosslinking with sol–gel,14, 15 thermal or photochemical,16–20 or interpenetrating polymer networks21–24 has already been carried out with poling in an electric field. The second harmonic generation coefficient of the poled crosslinked NLO polymers containing azobenzene has been maintained for a long term even at high temperatures after the electric field has been removed.…”

Section: Introductionmentioning

confidence: 99%

Effect of crosslinking on the photoinduced orientation of azo groups in thin polymer films

Takase

¹

,

Natansohn

²

,

Rochon

³

2001

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

A series of amorphous copolymers containing disperse red 1 and crosslinkable acrylic groups were prepared. The crosslinked polymers were prepared in thin films by thermal polymerization of the acrylic groups in the copolymers. The orientation induced by irradiation with a linearly polarized laser was measured as birefringence at several temperatures, and the effect of crosslinking on the photoinduced orientation was investigated. Crosslinking enhanced the stability of the photoinduced birefringence. In particular, crosslinking helped to maintain the birefringence both at high temperatures and after the linearly polarized laser was turned off. The birefringence dynamics was analyzed with biexponential curve fitting. Crosslinking influenced not only the birefringence levels but also its rate of growth. The growth rate of the photoinduced birefringence decreased by crosslinking, whereas the relaxation was not significantly affected. Although crosslinking restrained the mobility of the azo chromophores, a certain fraction could orient or move randomly even in highly crosslinked polymer networks. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 1686–1696, 2001

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Synthesis and properties of two kinds of nonlinear optical interpenetrating polymer networks

Cited by 19 publications

References 0 publications

Second-Order Polarizability and Temporal Stability of Epoxy Polymers Doped with Chromophore and with Chromophore Moieties in the Main Chain

Second-Order Polarizability and Temporal Stability of Epoxy Polymers Doped with Chromophore and with Chromophore Moieties in the Main Chain

Effect of crosslinking on the photoinduced orientation of azo groups in thin polymer films

Effect of crosslinking on the photoinduced orientation of azo groups in thin polymer films

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