Stannous oxalate: An efficient catalyst for poly(trimethylene terephthalate) synthesis

• 来源期刊: 中国科学B辑（英文版）
• 年，卷（期）: 2008,（3）
• 页码范围: 257-262
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11426-007-0124-7

摘要

A complete study on the catalytic activity of stannous oxalate for poly(trimethylene terephthalate) (PTT) synthesis via esterification method is carried out by comparison to the well known catalysts (tetrabutyl titanate (TBT), dibutyltin oxide (Bu2SnO), and stannous octoate (SOC)). Their catalytic activity in the esterification process is monitored by measuring the amount of water generated, while intrinsic vis-cosity (Ⅳ) and content of terminal carboxyl groups (CTCG) are used as the index in the polycondensa-tion process. Stannous oxalate shows higher activity than the other catalysts. Decrease in reaction time and improvements in PTT property are observed. The higher catalytic activity of stannous oxalate is attributed to its chelate molecular structure.