期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 115, 期 6, 页码 3401-3408出版社
WILEY-BLACKWELL
DOI: 10.1002/app.30910
关键词
synthesis of PTT; MoO3 supported Al2O3-TiO2 catalysts; polycondensation; polyesters
资金
- China High-Tech Development 863 Program [2007AA03Z217]
- Guangdong Province Sci Tech Bureau [2006B12401006, 06300332, 2007A090302040]
- Guangzhou Sci and Tech Bureau [2005U13D2031, 2007Z2D2031]
- Foshan Sci and Tech Bureau
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% MoO3/50% Al2O3-50% TiO2) (briefly written as xM/(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%, Al2O3-50% TiO2 (briefly written as A -T) was supported by MoO3 using wetting impregnation technique of (NH4)(6)Mo7O24.4H(2)O aqueous solution, a lot of Bronsted acid and Lewis acid sites were formed on xM/(A-T) catalyst surfaces, which was confirmed by the characteristics, of their NH3-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 ((M) over bar (w)) from 49,197 to 73,004. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115: 3401-3408, 2010
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