陈锡荣,张伟,闫一凡,张艳霞,张敬畅.纳米TiO2-TBOT复合催化生物可降解脂肪-芳香族共聚酯合成的研究[J].分子催化,2007,(6):561-565
纳米TiO2-TBOT复合催化生物可降解脂肪-芳香族共聚酯合成的研究
Synthesis Study of Biodegradable Aliphatic-Aromatic Copolyesters with Nano TiO2 -TBOT Catalyst
投稿时间:2007-02-05  修订日期:2007-04-25
DOI:
中文关键词:  二氧化钛,催化剂,聚酯,共聚酯,生物降解
英文关键词:Titanium dioxide,Catalyst,Polyester,Copolyester,Biodegradation
基金项目:中国石油化工股份有限公司科技开发项目(205081),国家教育部博士点基金(20050010014).
陈锡荣  张伟  闫一凡  张艳霞  张敬畅
北京化工大学现代催化研究所,中国石油化工股份有限公司北京化工研究院,中国石油化工股份有限公司北京化工研究院,中国石油化工股份有限公司北京化工研究院,北京化工大学现代催化研究所 北京100029中国石油化工股份有限公司北京化工研究院,北京100013,北京100013,北京100013,北京100013,北京100029
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中文摘要:
      以TiCl4为原料,采用溶胶-凝胶法制备了纳米级的TiO2,并用XRD和TEM等手段进行了表征,并以TiO2-TBOT(钛酸四丁酯)为催化剂,1,4-丁二醇、己二酸和对苯二甲酸二甲酯为原料制备了聚己二酸丁二醇酯和对苯二甲酸丁二醇酯的共聚物,对共聚物的相对分子质量、断裂拉伸强度和断裂伸长率进行了测试,以各反应的时间长短、共聚酯的分子量的高低和力学性能对催化剂性能进行了考察.并采用堆肥埋片法,以失重率作为降解性指标,考察了含芳香组分为40%、50%和60%摩尔分数的三种共聚酯的生物降解性.结果表明,纳米TiO2与TBOT的复合催化剂具有良好的催化性能,当TBOT/TiO2比例为1.2时,所制备共聚酯的重均分子量达到82000.在脂肪族聚酯中引入摩尔分数为40%~60%的芳香族组分,所制备的共聚酯具有较好的力学性能和生物降解性;且随着所含芳香组分的增多,生物降解性变差.
英文摘要:
      Nanosized TiO2 was prepared from TiCl4 by sol-gel method.The structural properties of the particles were characterized by means of XRD and TEM techniques.Aliphatic-aromatic copolyesters based on butanediol,adipic acid and terephthalic acid were synthesized by condensation in TiO2-TBOT catalyst.Weight-average molecular weight and some properties were measured to explain the catalyst activity of TiO2-TBOT.Biodegradation behaviors of the copolyesters were tested by composting with weight loss rate.It can be concluded that the molecular weight and material properties of the copolyester were enhanced by using TiO2-TBOT catalyst,and weight-average molecular weight of the copolyester exceeds 80000 with the composite catalyst as the optimum molar ratio of n(TBOT)/n(TiO2)is 1.2.And within a range of approximation 40%-60 mol% terephthalic acid in the acid components such as copolymers showed good biodegradability and material properties and better degradability depended on the lower aromatic composition.
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