Atom Transfer Radical Polymerization (ATRP) has been applied to synthesize liquid crystalline methacrylic polymers having three-arms star structure, starting from a central core of C3 symmetry. By just changing the duration of the polymerization process, macromolecules having distinct average chain lengths with low polydispersity values and well defined end-groups have been obtained. All the obtained star-shaped polymers, characterized by differential scanning calorimetry and polarized optical microscopy, exhibit smectic and nematic liquid-crystalline phases on heating, with transition temperatures strongly dependent on the average polymerization degree, and high cleaning points.
L. Angiolini, T. Benelli, L. Giorgini, F. Paris, E. Salatelli, T. Zuccheri (2007). Synthesis by ATRP and properties of liquid crystalline three-armed star polymers containing azobenzene chromophores. INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS, 56, 789-801 [10.1080/00914030601163449].
Synthesis by ATRP and properties of liquid crystalline three-armed star polymers containing azobenzene chromophores
ANGIOLINI, LUIGI;BENELLI, TIZIANA;GIORGINI, LORIS;SALATELLI, ELISABETTA;ZUCCHERI, TOMMASO
2007
Abstract
Atom Transfer Radical Polymerization (ATRP) has been applied to synthesize liquid crystalline methacrylic polymers having three-arms star structure, starting from a central core of C3 symmetry. By just changing the duration of the polymerization process, macromolecules having distinct average chain lengths with low polydispersity values and well defined end-groups have been obtained. All the obtained star-shaped polymers, characterized by differential scanning calorimetry and polarized optical microscopy, exhibit smectic and nematic liquid-crystalline phases on heating, with transition temperatures strongly dependent on the average polymerization degree, and high cleaning points.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
