Glass transition temperature chromophore content

Composites with a glass transition temperature below the temperature of measurement, with varying chromophore content respond in comparable response times of 200-500 ms. 

R. Bittner, C. Brauchle, and K. Meerholz. Influence of the glass-transition temperature and the chromophore content on the grating buildup dynamics of poly(A-vinylcarbazole)-based photorefractive polymers. App/. Opt., 37 (14) 2843-2851, May 1998. 

X is hexyl. The authors report that the typical tree-like macromolecular architecture of these molecules gives rise to a unique behavior in the glass transition temperature as well as in nonlinear optical properties. The nonlinear optical response shows a continuous increase in function depending on the chromophore content. In this way, the nonlinear optical properties can be increased in a way that is not possible with other chromophore-functionalized polymer materials.By attaching chromophores as side chains to the rigid non bendable backbone a treelike structure with flexible branches forms. 

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