Abstract
The study of the phase behavior of alkoxy-substituted phthalocyaninatopolysiloxanes reveals the existence of three different classes of this type of polymer, depending on the side chain length. Short side chain derivatives do not show any phase transition up to the decomposition temperature. Medium side chain derivatives show a transition to a highly viscous liquid-crystalline phase while the long side chain derivatives have an additional fluid mesophase at higher temperatures. In all solid and liquid-crystalline phases the rodlike molecules are packed in a two-dimensional hexagonal lattice with no discontinuous structural variations at the phase transition temperatures
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