Unexpected efficiency of cyclic amidine catalysts in depolymerizing poly(ethylene terephthalate)

被引：78

作者：

Fukushima, Kazuki ^{[1
,2
]}

Coady, Daniel J. ^{[1
]}

Jones, Gavin O. ^{[1
]}

Almegren, Hamid A. ^{[3
]}

Alabdulrahman, Abdullah M. ^{[3
]}

Alsewailem, Fares D. ^{[3
]}

Horn, Hans W. ^{[1
]}

Rice, Julia E. ^{[1
]}

Hedrick, James L. ^{[1
]}

机构：

[1] IBM Almaden Res Ctr, San Jose, CA 95120 USA

[2] Yamagata Univ, Dept Polymer Sci & Engn, Yonezawa, Yamagata 9928510, Japan

[3] King Abdul Aziz City Sci & Technol, Petrochem Res Inst, Riyadh 11442, Saudi Arabia

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2013年 / 51卷 / 07期

关键词：

degradation; monomer; organocatalysis; polyesters; RECYCLED PET; GLYCOLYSIS; PRODUCTS; WASTE; TEREPHTHALATE; KINETICS; RESIN;

D O I：

10.1002/pola.26530

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This article describes studies on the catalytic activity of several nitrogen-based organic catalysts for the depolymerization of poly(ethylene terephthalate) (PET), in which a few cyclic amidines work more effectively than a potent, bifunctional guanidine-based catalyst 1,5,7-triazabicyclo-[4,4,0]-dec-5-ene (TBD) in the presence of short chain diols that play a role in activation of carbonyl groups through hydrogen bonding. Further studies prove that the catalytic efficiency at the above specific conditions depends only on the extent of activation of a hydroxyl group rather than simply the pKa of the bases. For glycolysis with excess short-chain alkanediols, 1,8-diazabicyclo[5.4.0]undec-7-ene is the best catalyst. In contrast, TBD shows outstanding catalytic activity in depolymerizations of PET with mono-alcohols and longer-chain diols. (c) 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013, 51, 1606-1611

引用

页码：1606 / 1611

页数：6

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