Ti_(3)C_(2)T_(x)MXene对聚2,5-呋喃二甲酸乙二醇酯的催化成核作用研究

Catalytic and Nucleation Study of Ti_(3)C_(2)T_(x)MXene on Furanic Polyesters

长期以来,聚酯催化剂主要为锑系化合物,存在潜在的重金属污染风险。为开发一种高效环保的聚酯缩聚催化剂,本工作首先对新型二维材料Ti_(3)C_(2)T_(x)MXene与代表性锑系催化剂Sb2O3进行催化对比研究。结果发现,Ti_(3)C_(2)T_(x)MXene对聚2,5-呋喃二甲酸乙二醇酯(PEF)有显著的缩聚催化活性,所得PEF特性黏度可以达到0.74 dL/g。其次,使用差示扫描量热仪(DSC)对两种催化剂制备的PEF聚酯进行热性能与结晶动力学研究,确认了具有异质纳米片结构的Ti_(3)C_(2)T_(x)MXene可以作为成核剂提升PEF的结晶速率。最后,机械性能研究表明,催化剂种类不影响PEF的拉伸模量与拉伸强度,进一步表明Ti_(3)C_(2)T_(x)MXene与PEF的相容性较好。综上,本工作表明Ti_(3)C_(2)T_(x)MXene是PEF的高效催化/成核剂。

Polyester catalysts are mainly antimony-based compounds for a long time,which have potential heavy-metal hazards.To develop an efficient and environmentally friendly polycondensation catalyst,firstly,a comparative catalytic study of the novel two-dimensional material Ti_(3)C_(2)T_(x)MXene and the representative antimony-based catalyst Sb2O3 was conducted.The results showed that Ti_(3)C_(2)T_(x)MXene exhibited significant catalytic activity for the condensation of polyethylene 2,5-furandicarboxylate(PEF)with intrinsic viscosity up to 0.74 dL/g.Secondly,the thermal properties and crystallization kinetics of PEF prepared by both catalysts were investigated using differential scanning calorimetry(DSC).Ti_(3)C_(2)T_(x)MXene with the heterogeneous nanosheet structure was confirmed as a nucleating agent to enhance the crystallization rate of PEF.Finally,the mechanical investigation showed that the catalyst type did not affect the mechanical properties of PEF,indicating the good compatibility of Ti_(3)C_(2)T_(x)MXene with PEF.In summary,this work showed that Ti_(3)C_(2)T_(x)MXene is an efficient catalyst/nucleating agent for PEF.