Stannous-acetylacetonate was prepared efficiently and characterized by ^1H NMR and FT-IR. Its catalytic activity for poly（trimethylene terephthalate） （PTT） synthesis was investigated. By this catalyst, the degree ...Stannous-acetylacetonate was prepared efficiently and characterized by ^1H NMR and FT-IR. Its catalytic activity for poly（trimethylene terephthalate） （PTT） synthesis was investigated. By this catalyst, the degree of esterification of pure terephthalic acid was up to 91.7% after reaction at 260 ℃ for 2 h, while the intrinsic viscosity and content of terminal carboxyl groups of the corresponding PTT polymerized at 260 ℃, 60 Pa for 2 h was 0.8816 dL/g and 17 mol/t,respectively. Stannous-acetylacetonate was more active and promising than tetrabutyl titanate and stannous octoate for PTT synthesis.展开更多
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 titana...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 viscosity (IV) and content of terminal carboxyl groups (CTCG) are used as the index in the polycondensation 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.展开更多
以聚对苯二甲酸(PTA)、1,3-丙二醇(1,3-PDO)与1,4-环己烷二甲醇(CHDM)制备具有低结晶性能的聚对苯二甲酸1,3-丙二醇-co-1,4-环己烷二甲酯(PTTG)作为第三组分,采用熔融挤出法制备易于染色的低结晶度丙烯腈-丁二烯-苯乙烯塑料(ABS)/聚对...以聚对苯二甲酸(PTA)、1,3-丙二醇(1,3-PDO)与1,4-环己烷二甲醇(CHDM)制备具有低结晶性能的聚对苯二甲酸1,3-丙二醇-co-1,4-环己烷二甲酯(PTTG)作为第三组分,采用熔融挤出法制备易于染色的低结晶度丙烯腈-丁二烯-苯乙烯塑料(ABS)/聚对苯二甲酸1,3-丙二酯(PTT)/PTTG三元共混复合材料。通过差示扫描量热仪、热重分析、扫描电子显微镜和电子万能试验机考察了PTTG的质量分数对ABS/PTT/PTTG复合材料的热稳定性、断面形貌、相容性及力学性能的影响。研究结果表明,随着PTTG共聚酯含量增加,ABS/PTT/PTTG复合材料的熔融温度和结晶性能逐渐降低,结晶度由48.08%降低到24.42%,PTTG对ABS/PTT复合材料具有明显的增容作用,同时材料的热稳定性也逐渐提高。当PTTG的质量分数达到25%时,有较为明显的屈服现象,复合材料断面发生韧性断裂,呈现韧性断裂特征;拉伸强度和弯曲强度随着PTTG含量的增加逐渐降低,当PTTG的质量分数达到25%时,复合材料的缺口冲击强度达到4.4 k J/m~2,较ABS/PTT复合材料提高了29.41%。展开更多
文摘Stannous-acetylacetonate was prepared efficiently and characterized by ^1H NMR and FT-IR. Its catalytic activity for poly（trimethylene terephthalate） （PTT） synthesis was investigated. By this catalyst, the degree of esterification of pure terephthalic acid was up to 91.7% after reaction at 260 ℃ for 2 h, while the intrinsic viscosity and content of terminal carboxyl groups of the corresponding PTT polymerized at 260 ℃, 60 Pa for 2 h was 0.8816 dL/g and 17 mol/t,respectively. Stannous-acetylacetonate was more active and promising than tetrabutyl titanate and stannous octoate for PTT synthesis.
基金Supported by the National High Technology Research and Development Program of China 863 Plan (Grant No. 2003AA321010) the Innovation Research Fund of Graduate University, Chinese Academy of Sciences (2006)
文摘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 viscosity (IV) and content of terminal carboxyl groups (CTCG) are used as the index in the polycondensation 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.
文摘以聚对苯二甲酸(PTA)、1,3-丙二醇(1,3-PDO)与1,4-环己烷二甲醇(CHDM)制备具有低结晶性能的聚对苯二甲酸1,3-丙二醇-co-1,4-环己烷二甲酯(PTTG)作为第三组分,采用熔融挤出法制备易于染色的低结晶度丙烯腈-丁二烯-苯乙烯塑料(ABS)/聚对苯二甲酸1,3-丙二酯(PTT)/PTTG三元共混复合材料。通过差示扫描量热仪、热重分析、扫描电子显微镜和电子万能试验机考察了PTTG的质量分数对ABS/PTT/PTTG复合材料的热稳定性、断面形貌、相容性及力学性能的影响。研究结果表明,随着PTTG共聚酯含量增加,ABS/PTT/PTTG复合材料的熔融温度和结晶性能逐渐降低,结晶度由48.08%降低到24.42%,PTTG对ABS/PTT复合材料具有明显的增容作用,同时材料的热稳定性也逐渐提高。当PTTG的质量分数达到25%时,有较为明显的屈服现象,复合材料断面发生韧性断裂,呈现韧性断裂特征;拉伸强度和弯曲强度随着PTTG含量的增加逐渐降低,当PTTG的质量分数达到25%时,复合材料的缺口冲击强度达到4.4 k J/m~2,较ABS/PTT复合材料提高了29.41%。
