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Synthesis of high‐molecular weight poly(trimethylene terephthalate) catalyzed by MoO 3 supported Al 2 O 3 ‐TiO 2 catalysts
Author(s) -
Liu Jian,
Bian ShuGuang,
Xiao Min,
Wang ShuanJin,
Meng YueZhong
Publication year - 2009
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.30910
Subject(s) - catalysis , materials science , wetting , aqueous solution , nuclear chemistry , polymer chemistry , terephthalic acid , chemical engineering , chemistry , organic chemistry , composite material , polyester , engineering
Abstract Poly(trimethylene terephthalate) (PTT) is an excellent fiber materials. Although it was synthesized as early as 1940s, obtaining high‐molecular weight PTT suitable for spinning is not easy due to no evident breakthrough in the catalysts for PTT synthesis. Patents and literatures disclosed a lot of the catalysts of preparing PTT, but which are more or less disadvantageous. Based on acid catalytic mechanism of PTT preparation, a series of solid acid as x % MoO 3 /(50% Al 2 O 3 − 50% TiO 2 ) (briefly written as x M/(A − T), x = 0, 10, 15, 20 by weight) were prepared by sol–gel coprecipitation and wetting impregnation methods, and first used for PTT synthesis in this work. When 50% Al 2 O 3 − 50% TiO 2 (briefly written as A − T) was supported by MoO 3 using wetting impregnation technique of (NH 4 ) 6 Mo 7 O 24 .4H 2 O aqueous solution, a lot of Brφnsted acid and Lewis acid sites were formed on x M/(A − T) catalyst surfaces, which was confirmed by the characteristics of their NH 3 ‐TPD (temperature programmed desorption). All the prepared catalysts were highly active ones toward synthesis of PTT. PTT with high‐intrinsic viscosity (IV) was obtained in the presence of trace amount of the catalysts. IV ranging of the PTT synthesized from 0.66 to 0.95 dL g −1 corresponds to weight average molecular weight $ (\overline M_w) $ from 49,197 to 73,004. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010