38. Poly[(2,2',5',2''-tetramethoxy-p-terphenyl-5,5''-ylene)propylene]: Synthesis and Physical Properties of a Novel Amorphous Regularly Segmented Conjugated Polymer

DEL ROSSO, P. G.; ALMASSIO, M. F.; ARAMENDÍA, P.; ANTOLLINI, S. S.; GARAY, R. O.

EUROPEAN POLYMER JOURNAL

Elsevier Ltd.

Lugar: Amsterdam, The Netherlands; Año: 2007 vol. 43 p. 2584 - 2593

0014-3057

A new regularly segmented conjugated polymer with methoxy-substituted p-terphenylene units tethered by their meta positions along the polymer main chain was synthesised using the Suzuki cross-coupling reaction. The small size of the connector and lack of long lateral chains lead to a high density of rigid electrooptically active moieties in the structure. However, this molecular architecture produces a very soluble and amorphous polymer with relatively high Tg. The optical properties of samples with different degrees of polymerisation were investigated using UV-visible absorption, steady state and time-resolved photoluminescence emission spectroscopies. Their absorption and emission properties are rather insensible to Mn after reaching a modest DP, to the aggregation state, either solution or neat film, and to annealing. The contorted polymer chain forms a very stable morphology and substantially hinders interactions between chromophores, thus diminishing the formation of aggregated species that are commonly observed in other electrooptically active polymers.