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Thermoplastic softening behavior of organically modified polyoxotitanates: Effects of the amount of water and benzoylacetone for hydrolyzing alkoxides
Author(s) -
Oda Shinya,
Kozuka Hiromitsu,
Uchiyama Hiroaki
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42653
Subject(s) - softening , materials science , hydrolysis , thermoplastic , polymer chemistry , softening point , permeation , polymerization , titanium , composite material , organic chemistry , chemistry , polymer , metallurgy , biochemistry , membrane
ABSTRACT Organically modified polyoxotitanates were prepared by hydrolyzing titanium tetra‐ n ‐butoxide in the presence of benzoylacetone (BzAc) in solution at Ti(OC 4 H 9 ) 4 : BzAc : H 2 O : CH 3 COCH 3 mole ratios of 1 : (1 or 2) : (1 or 10) : 20. The solutions were concentrated at 80°C and dried at 140°C in N 2 flow, producing transparent and yellow materials of BzAc‐modified polyoxotitanate. The materials had refractive indices of ∼1.7 and exhibited thermoplastic softening at temperatures below 70°C. Low contents of BzAc and high contents of H 2 O 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 H 2 O contents in solution. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42653.