有機-無機ハイブリッド低融点ガラス前駆体O=P (OSiMe_3)_x(OH)_<3-x>の合成

概要

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The synthesis of organic-inorganic hybrid precursors for low-melting glass has been proposed. Ln this process, a non-aqueous acid-base reaction of P-OH+Si-Cl→P-O-Si+HCl : was employed using orthophosphoric acid (H_3PO_4,) and trimcthylchlorosilane (Me_3SiCl) as starting materials. The formation of P-O-SiMe_3 linkage and the disappearance of P-OH group were confirmed by ^<29>Si and ^<31>P NMR spectra. The viscosity decrease of the precursors observed at high Si concentrations was caused by the decrease in the number of P-OH, which was correlated to the decrease of the hydrogen bond. By the use of P-O-SiMe_3 linkage, low-melting glasses in the system of Me_3SiO_<0.5>-Me_2SiO-P_2O_5 have also been prepared through the non-aqueous acid-base reaction. The hybrid classes thus obtained exhibited low glass transition temperatures, which changed from 29 to -47℃ as the -SiMe_3 content increased. Termination of the oxide framework by the organic functional groups lowered the network dimension, giving rise to the lower glass transition temperature.
2003-03-01