The synthesis, characterization and third-order nonlinear optical character of poly(2,5-dipropargyloxybenzoate) containing a polar aromatic diacetylene

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• 作者：S ; ra L. Casta&#xf1 ; on ; Miriam F. Beristain ; Alej ; ra Ortega ; Gustavo G&#xf3 ; mez-Sosa ; Eduardo Mu&#xf1 ; oz ; Ana Laura Perez-Martí ; nez ; Takeshi Ogawa ; M. Faisal Halim ; Francis Smith ; Ardie Walser ; Rog
• 关键词：Polar aromatic diacetylene ; Nonlinear optics ; Cross-linking ; Z-Scan ; Free radicals
• 刊名：Dyes and Pigments
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：88
• 期：2
• 页码：129-134
• 全文大小：635 K

文摘

The glass transition temperature of the novel compound, poly(2,5-dipropargyloxybenzoate) containing a polar aromatic diacetylene was 105 °C and differential scanning calorimetry showed two exothermic peaks due to the opening of the hexa-2,4-diynylene-1,6-dioxy group and the aromatic diacetylene group. Two types of free radical were detected in the electron spin resonance spectra of the heated polymer, one formed by cross-linking of the main chain hexa-2,4-diynylene-1,6-dioxy group and another arising from the aromatic chromophore diacetylene. The third-order nonlinear optical susceptibility, χ⁽³⁾, of the polymer film determined using the Z-scan technique was −4.5 ± 1 × 10⁻¹⁰ esu. When the films were irradiated by UV light at 140 °C, they formed micro-cracks due to intense cross-linking.