Thermoplasticity of sol-gel-derived titanoxanes chemically modified with benzoylacetone
Thermoplasticity of sol-gel-derived titanoxanes chemically modified with benzoylacetone
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DOI：
10.1007/s10971-014-3304-x
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发表时间：
2014-06-01
影响因子：
2.5
通讯作者：
Kozuka, Hiromitsu
中科院分区：
文献类型：
--
作者：
Oda, Shinya;Uchiyama, Hiroaki;Kozuka, Hiromitsu
Titanium tetra-n-butoxide was hydrolyzed in the presence of benzoylacetone (BzAc), and the solution obtained was concentrated and served for spin-coating or dropping on substrates, followed by successive drying at 120, 200 and 250 A degrees C. The dried products were transparent and amorphous, and the infrared absorption and Raman spectroscopic studies showed that BzAc forms chelate rings. Thermomechanical analysis showed that the 120 and 200 A degrees C-dried products showed steep, thermoplastic shrinkage at around 30 and 70-85 A degrees C, respectively, whereas the 250 A degrees C-dried product did not show thermoplasticity. Thus as the drying temperature was increased, the thermoplasticity appeared at a higher temperature and finally disappeared. These changes in thermoplasticity with drying temperature were concluded to result from the progress of condensation between titanoxane polymers and/or clusters, which was evidenced in gel permeation chromatographic analysis.
