Citation: ZHOU Zhaohui, DAI Daorong, ZHANG Rongben. SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS[J]. Chinese Journal of Polymer Science, ;1992, 10(1): 70-74. shu

SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS

Received Date: 5 April 1991

A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane (Pd-DKLCP) has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane (DKLCP), using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature TK and the enthalpy change △H_K from crystal to liquid crystal state and making the temperature range of LC state △T(△T=TCl-TK) widened. All these chelates Pd-DKLCP's do not show TC1 until decomposition at 205℃.It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does.It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd2+ ion with 4d orbital.
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