On photochromic transformations of polymers

Kardash, N. S.; Krongauz, Valeri; Zaitseva, Ye.L.; Movshovich, A.V.

doi:10.1016/0032-3950(74)90574-7

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…The values obtained are rather high for photoisomerization in the literature. [27][28][29][30][31][32][33][34][35] In these determinations, all side reactions have been neglected. In particular, due to the slow rate constants…”

Section: Resultsmentioning

confidence: 99%

Coupling between Photochromism and Second-Harmonic Generation in Spiropyran- and Spirooxazine-Doped Polymer Films

Atassi¹,

Delaire²,

Nakatani³

1995

J. Phys. Chem.

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The photochemical ring opening of spiropyrans in polymethylmethacrylate (PMMA) host films in the presence of a high-voltage electric field (2-5 MV/cm) leads to a photo-orientation of photomerocyanines. Since photomerocyanines have rather high first-order hyperpolarizabilities, this photo-orientation leads to secondharmonic generation (SHG). The second-order susceptibility & of PMMA films doped with 6-nitro-1',3',3'-trimethylspiro[2H-l-benzopyran-2,2'-indoline] (25% w/w) has been measured at 10 p m N . If a PMMA film doped with spiropyran and preoriented by corona poling at 90 "C is irradiated in the UV, an SHG signal of photomerocyanine is also observed as a result of a memory effect of the orientation of spiropyran molecules. The photoswitching of this nonlinear optical property can be inverted by visible light irradiation. Only partially reversible switching is observed because of a gradual light-induced disorientation of photomerocyanine dipoles.Photochemical quantum yields of the spiropyran * photomerocyanine reaction have also been determined in PMMA for one system. Dipole moments and hyperpolarizabilities of closed and open forms have been calculated by semiempirical and finite field methods for an analogous system.

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Section: Resultsmentioning

confidence: 99%

Coupling between Photochromism and Second-Harmonic Generation in Spiropyran- and Spirooxazine-Doped Polymer Films

Atassi¹,

Delaire²,

Nakatani³

1995

J. Phys. Chem.

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“…For example, MMA and SMA have comparable reactivities. 18 The spectrum of the polymer solution in MTHF (Figure 5) differs markedly from the spectrum of SMA. It has two absorption maxima, at ~500 and ~560 nm, and only barely visible shoulders near 600 and 640 nm.…”

Section: Resultsmentioning

confidence: 97%

Crystallization of poly(spiropyran methacrylate) with cooperative spiropyran-merocyanine conversion

Krongauz¹,

Goldburt²

1981

Macromolecules

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“…Figure3. Dependence of Tg on the spirooxazine content in the polymers: circles 1 and 2, linear polymer substituted, respectively, by spirooxazines VI and VII; circle 3, cyclic polymer with spirooxazine VII; circle 4, the unsubstituted linear polysiloxane.…”

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confidence: 99%

Steric effects in photochromic polysiloxanes with spirooxazine side groups

Zelichenok¹,

Buchholtz²,

Yitzchaik³

et al. 1992

Macromolecules

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Synthesis and properties of linear and cyclic polysiloxanes with photochromic spirooxazine side groups were investigated. The photochromic groups were connected to the main chains through a flexible (CH2)" spacer. The number of photochromic groups that can be incorporated in the polymer by a polymer analogous reaction is restricted for the short spacer (CH2)3 to ~50%, while the photochromic groups with the longer spacer (CH2)e can be added to practically each polymer unit. The rates of the thermal decoloration reactions are also determined by the spacer lengths and the spirooxazine content. At high content, a deviation from first-order kinetics was observed for the color decay. The effects are explained by the steric interactions of the bulky photochromic groups. Computer simulation of the molecular movement in the macromolecules confirmed the explanation.

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On photochromic transformations of polymers

Cited by 7 publications

References 1 publication

Coupling between Photochromism and Second-Harmonic Generation in Spiropyran- and Spirooxazine-Doped Polymer Films

Coupling between Photochromism and Second-Harmonic Generation in Spiropyran- and Spirooxazine-Doped Polymer Films

Crystallization of poly(spiropyran methacrylate) with cooperative spiropyran-merocyanine conversion

Steric effects in photochromic polysiloxanes with spirooxazine side groups

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