聚对苯二甲酸异山梨醇/乙二醇共聚酯及其熔纺纤维性能

Properties of Polyisosorbide/ethylene Terephthalate Copolyester and Its Melt-Spun Fiber

通过三元共聚将生物基异山梨醇(Is)引入到聚对苯二甲酸乙二醇酯(PET)的分子链中,制备了系列聚对苯二甲酸异山梨醇/乙二醇共聚酯(PEIT)。进一步熔融纺丝获得了PEIT纤维。利用核磁共振波谱仪、凝胶渗透色谱、差示扫描量热仪、热重分析仪、X射线衍射仪及纤维强力仪分析研究了PEIT共聚酯的结构和性能。结果表明,Is刚性单元显著提高了PEIT的玻璃化转变温度(T g),保持了共聚物良好的热稳定性;同时破坏了分子链的规整性,使其结晶度有所降低。PEIT具有良好的可纺性,Is摩尔分数为5%时,PEIT纤维具有优异的力学性能,断裂强度较PET纤维增加了45%;仅当Is摩尔分数高于40%时,可拉伸性下降。

Bio-based isosorbide(Is)was introduced into the molecular chains of polyethylene terephthalate(PET)through ternary copolymerization to prepare a series of polyethylene terephthalate/ethylene glycol copolyesters(PEIT).PEIT fibers were further prepared by melt spinning.The structure and properties of polyester were investigated by nuclear magnetic resonance spectrometer(NMR),gel chromatography(GPC),differential scanning calorimeter(DSC),thermogravimetric analysis(TG),X-ray diffractometer(XRD)and fiber strength analysis.The results show that the Is rigid units significantly increase the glass transition temperature(T g)of PEIT and maintain the good thermal stability of the copolymer;meanwhile,the regularity of the molecular chains is destroyed,the crystallinity is reduced.PEIT has good spinnability.When the Is molar fraction is 5%,PEIT fibers have excellent mechanical properties,and the breaking strength is 45%higher than that of PET fiber;only when the Is molar fraction is higher than 40%,the stretchability is decreased.