000052140 001__ 52140
000052140 005__ 20181203015820.0
000052140 0247_ $$2doi$$a10.1002/1521-3935(20020501)203:8<1106::AID-MACP1106>3.0.CO;2-F
000052140 037__ $$aARTICLE
000052140 245__ $$aFluorescent star-shaped polystyrenes: "Core-first" synthesis from perylene-based ATRP initiators and dynamic mechanical solid-state properties
000052140 269__ $$a2002
000052140 260__ $$c2002
000052140 336__ $$aJournal Articles
000052140 520__ $$aThis paper describes the synthesis of two novel tetra 2-bromoisobutyric acid-substituted perylene fluorophores and their use as initiators for the atom transfer radical polymerization of styrene. Different star-shaped polystyrenes covering a wide range of molecular weights were prepared by variations in the initial molar ratio between styrene and the perylene chromophores. Bulk properties of the star polymers were investigated by X-ray scattering, differential scanning calorimetry, and dynamic mechanical measurements. These studies revealed that the polystyrene arms effectively suppress the aggregation of the perylene chromophores and indicated that, especially at low degrees of polymerization, the rigid-core moiety significantly affects the segmental dynamics of the arms. Spin-casting of the polystyrene stars afforded optically transparent films, which displayed high fluorescent quantum yields. Due to the covalent linkage between the polystyrene chains and the perylene chromophore, the dye-contents of such films can be much higher than those achievable by dissolution of the corresponding low-molar-mass perylene dye in a polystyrene matrix. In addition, the polystyrene arms are likely to reduce the mobility of the chromophore within a polystyrene matrix. These features make these fluorescent star-shaped polymers of interest to improve the migration fastness of colored polystyrene samples.
000052140 700__ $$0240029$$g156848$$aKlok, H.-A.
000052140 700__ $$aBecker, S.
000052140 700__ $$aSchuch, F.
000052140 700__ $$aPakula, T.
000052140 700__ $$aMüllen, K.
000052140 773__ $$j203$$tMacromolecular Chemistry and Physics$$k8$$q1106-1113
000052140 909C0 $$xU10342$$0252017$$pLP
000052140 909CO $$pSTI$$particle$$ooai:infoscience.tind.io:52140
000052140 937__ $$aLP-ARTICLE-2002-004
000052140 970__ $$a29/LP
000052140 973__ $$sPUBLISHED$$aEPFL
000052140 980__ $$aARTICLE