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.
SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS
摘要:
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.
English
SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS
Abstract:
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.
扫一扫看文章
计量
- PDF下载量: 0
- 文章访问数: 1750
- HTML全文浏览量: 44
下载:
