Preparation and Optical Limiting Properties of Polyurethane Containing Long Conjugated Chromophores

Abstract

Two functional polyurethanes (P1 and P2) bearing a large p electron conjugated chromophoric pendant were synthesized and characterized by FT-IR, 1 H-NMR and UV-Vis absorption spectra. Their optical limiting properties were evaluated. The results show that P1 and P2 show novel optical limiting properties, which are assigned to a long p electron conjugated chromophoric pendant. It was found that their optical limiting properties were affected simultaneously by solution concentration and P2 displays a better optical limiting property than P1 at the same solution transmittance, although that P1 has larger x (3) (4.28 Â 10 211 esu) than P2 (0.87 Â 10 211 esu), and their optical limiting mechanism is investigated.

Molecular Hybrid Optical Limiting Materials from Polyhedral Oligomer Silsequioxane: Preparation and Relationship between Molecular Structure and Properties

“…It can be found that higher concentration (lower transmittance) solution exhibits better performances. Similar results were also found by Kojima's and our previous publications . Solution with higher concentration has more molecules per unit volume, thereby absorbing the energy of the harsh laser more efficiently.…”

“…Similar results were also found by Kojima's 48 and our previous publications. 49 Solution with higher concentration has more molecules per unit volume, thereby absorbing the energy of the harsh laser more efficiently.…”

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

“…Water-soluble organic polymeric dyes were also found to possess third-order nonlinearity. Thin films of polymers 433 and 434 (Chart ) showed nonlinear absorption in the IR with a TPA coefficient of 55 and 18 cm/GW, respectively. , Functional polyurethanes 435a , b were synthesized, and their OL properties were evaluated. , These were ascribed to the presence of long π-electron conjugated chromophoric pendants. Polymer 435b displayed better OL properties than 435a at the same value of linear transmittance, although 435a had a larger χ (3) (4.28 × 10 –11 esu) than 435b (0.87 × 10 –11 esu) from RSA mechanism.…”

“…959,960 Functional polyurethanes 435a,b were synthesized, and their OL properties were evaluated. 961,962 These were ascribed to the presence of long π-electron conjugated chromophoric pendants. Polymer 435b displayed better OL properties than 435a at the same value of linear transmittance, although 435a had a larger χ (3) (4.28 × 10 −11 esu) than 435b (0.87 × 10 −11 esu) from RSA mechanism.…”

Synthesis and characterization of strongly two photon absorbing and photoswitchable azo molecules

“…(2) and 4-((4-(bis(2-hydroxyethyl)amino)phenyl)diazenyl) benzaldehyde (3) were synthesised by the methods of Su et al [21] and Ledoux et al [22] respectively. Tetraethyl ((9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl)bis(methylene))bis(phosphonate) was synthesised by an adaptation of the method of Mongin et al [23], while tetraisopropyl ((2-((2-ethylhexyl)oxy)-5-methoxy-1,4-…”