Thermoplastic softening behavior of organically modified polyoxotitanates: Effects of the amount of water and benzoylacetone for hydrolyzing alkoxides
Thermoplastic softening behavior of organically modified polyoxotitanates: Effects of the amount of water and benzoylacetone for hydrolyzing alkoxides
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DOI：
10.1002/app.42653
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发表时间：
2015-11-05
影响因子：
3
通讯作者：
Uchiyama, Hiroaki
中科院分区：
文献类型：
--
作者：
Oda, Shinya;Kozuka, Hiromitsu;Uchiyama, Hiroaki
Organically modified polyoxotitanates were prepared by hydrolyzing titanium tetra-n-butoxide in the presence of benzoylacetone (BzAc) in solution at Ti(OC4H9)(4) : BzAc : H2O : CH3COCH3 mole ratios of 1 : (1 or 2) : (1 or 10) : 20. The solutions were concentrated at 80 degrees C and dried at 140 degrees C in N-2 flow, producing transparent and yellow materials of BzAc-modified polyoxotitanate. The materials had refractive indices of similar to 1.7 and exhibited thermoplastic softening at temperatures below 70 degrees C. Low contents of BzAc and high contents of H2O in solution led to higher softening temperatures of the materials, indicating the tunability of the softening temperature. Gel permeation chromatographic analyses showed that the higher softening temperatures originated mainly from polymerized species of higher molecular weights that were generated by hydrolysis and condensation reactions promoted by the low BzAc and high H2O contents in solution. (C) 2015 Wiley Periodicals, Inc.
