Details

Autor(en) / Beteiligte

• Pethrick, Richard A
• Thomas, Sabu
• Sinturel, Christophe
• Thomas, Raju

Titel

Applications

Ist Teil von

• Micro‐ and Nanostructured Epoxy/Rubber Blends, 2014, p.339-362

Ort / Verlag

Weinheim, Germany: Wiley‐VCH Verlag GmbH & Co. KGaA

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• Epoxy resins are widely used in a variety of structural applications where ready assembly of complex structures has to be achieved. In particular, the advantages of adhesive bonds over other fastening methods have led to the wide use of toughened epoxy resins in aerospace manufacture. With the desire to reduce weight in the final structure, epoxy and related curable resins are used in the construction of composite parts. This chapter considers some of the materials that are used in these applications. The photoinduced anisotropy and optical storage properties in several cross‐linked epoxy and urethane‐based azo polymers with different architectures and chromophore contents have been investigated. Push–pull azo chromophores: Disperse Orange‐3 (DO3), Disperse Red 19 (DR19), and Disperse Red 13 were selected as photosensitive reactives. Measurements of the birefringence (Δn) induced with linearly polarized 488 nm light show that the Δn values increase with chromophore weight fraction. Networks with the same chromophore concentration but different backbones exhibit similar levels of induced anisotropy under the same irradiation conditions. The remnant birefringence (RB) and relaxation times are influenced by the molecular weight between cross‐links (Mc) of networks. Cross‐linked epoxy‐based azo polymers containing different alkyl‐chains‐containing compounds and constant chromophore concentration were also synthesized. Their reversible optical storage properties were studied and compared. It was found that the optical response is a direct consequence of the morphologies generated, and because crystallization of the alkyl chains can take place. In summary, playing with the chemical reactants, their stoichiometric ratio, and the presence of modifiers, networks with different structure, and thermal properties can be synthesized. It was possible to develop promising materials with variable optical response, to be used in optical storage devices and other optical applications.