Article ID Journal Published Year Pages File Type
1497570 Optical Materials 2007 7 Pages PDF
Abstract
We have investigated the correlation between the macroscopic physical properties and the microscopic molecular structure for linear rod-like polyamides with different linking structure of nonlinear optical chromophores by in situ corona poling and optical second harmonic generation. These polymers consist of a wholly aromatic rigid backbone poly(p-phenylene terephthalamide), PPTA and nonlinear optical chromophores of various sizes. Though all polymers with different linking structure of chromophores possess similar α- and β-glass transition temperatures, their bulk physical properties greatly depend on the microscopic linking structure. Especially the polyamide F-DCVA with a flexibly linked bulky chromophore exhibits a high internal stress due to a thermal contraction of the rigid polyamide backbone, which at room temperature can overcome the orientational force of the externally applied electric field.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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