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A novel and facile method toward a series of yellow water-borne polyurethane was developed by using an intrinsically colored diol in this paper.The yellow aqueous dispersion PCLD-HENA-PU was synthesized based on isophorone diisocyanate(IPDI), polycaprolactonediol(PCLD) and 2,2-dimethylol propionic acid(DMPA) using a yellow diol N,N-bis(2-hydroxyethyl)-4-nitroaniline (HENA) as a chain extender.Due to the complete reaction of OH group in colorant HENA with NCO group in diisocyanate,a series of stable yellow polyurethanes could be obtained conveniently and easily.The structure of PCLD-HENA-PUs was confirmed by means of Fourier transform infrared spectroscopy.The UV-visible absorption analysis showed a blue shift effect of about 7 nm when HENA was blocked into polyurethane chain.The absorption intensity of PCLD-HENA-PUs increased with increasing HENA content.It was found that the tensile strength enhanced from 8.6 to 19.6 MPa with HENA content increased from 0 to 18.0%,while the extensibility decreased from 449 to 300%.The thermal gravimetric analysis presented that the initial decompose temperature began from about 250℃,and had a little increase with increasing the HENA content.
A novel and facile method toward a series of yellow water-borne polyurethane was developed by using an intrinsically colored diol in this paper. The yellow aqueous dispersion PCLD-HENA-PU was synthesized based on isophorone diisocyanate (IPDI), polycaprolactonediol (PCLD) and 2,2-dimethylol propionic acid (DMPA) using a yellow diol N, N-bis (2-hydroxyethyl) -4-nitroaniline (HENA) as a chain extender. in diisocyanate, a series of stable yellow polyurethanes could be obtained conveniently and easily. The structure of PCLD-HENA-PUs was confirmed by Fourier transform infrared spectroscopy. The UV-visible absorption analysis showed a blue shift effect of about 7 nm when HENA was blocked into polyurethane chain. The absorption intensity of PCLD-HENA-PUs increased with increasing HENA content. It was found that the tensile strength enhanced from 8.6 to 19.6 MPa with HENA content increased from 0 to 18.0%, while the extensibil ity decreased from 449 to 300%. The thermal gravimetric analysis presented that the initial decompose temperature began from about 250 ° C, and had a little increase with increasing the HENA content.