【摘要】 以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇、2,2-二羟甲基丙酸、酸性媒介黑T(EBT)或1,4-丁二醇(BDO)等为主要原料,经自乳化法分别合成制备出TDI型水性聚氨酯EBT-PU和BDO-PU。Fourier变换红外光谱分析证实了EBT-PU和BDO-PU的结构。研究发现由于EBT接入聚氨酯分子链时引起助色团-OH消失以及EBT中偶氮基生色团与萘环等整体共轭体系受到影响,528nm处的UV-Vis吸收峰出现了44nm的红移。虽然EBT-PU和BDO-PU分子链中软硬段都不相容,但EBT共轭结构较BDO的脂肪链结构对软硬段不相容性影响更大。实验证实EBT-PU染料是一非晶聚合物,EBT的共轭结构可使EBT-PU热稳定性得到明显改善。更多还原

【Abstract】 A noval waterborne polyurethane dye EBT-PU and a reference BDO-PU were synthesized using toluene diisocyanate,polyoxypropylene glycol,2,2-dimethylol propionic acid and eriochrome black T(EBT) or 1,4-butanediol(BDO) by self-emulsification method.The structure of EBT-PU and BDO-PU was confirmed by Fourier transform infrared spectroscopy.It was found that the maximum absorption of 528nm in UV-Visible spectrum appeared a bathochromic shift of 44nm because of the disappearance of auxochrome-OH and the change of conjugate system for EBT during the reaction between EBT and-NCO group.Although the soft and hard segments in chains of EBT-PU and BDO-PU are incompatible,the conjugate structure of EBT has a big effect on the incompatibility comparing to the aliphatic chain of BDO.The experimental result shows that EBT-PU is an amorphous polymer,and the conjugate structure of EBT can introduce a distinct improve for the thermal stability of EBT-PU.更多还原