4,4’-二氨基二苯乙烯-2,2’-二磺酸改性水性聚氨酯的制备及性能

Preparation and Properties of Waterborne Polyurethane Modified by 4,4’-Diaminodiphenylethylene-2,2’-disulfonic Acid

以异佛尔酮二异氰酸酯（IPDI）及聚己内酯二元醇（PCL1000）为主要原料,二羟甲基丙酸（DMPA）为亲水扩链剂,制得了一系列水性聚氨酯预聚体。利用4,4＇-二氨基二苯乙烯-2,2＇-二磺酸（DSD酸）作为扩链剂进行改性,得到荧光水性聚氨酯（SWPU）。采用FTIR、DLS、XRD、UV-Vis、荧光光谱、力学性能分析、热重分析对荧光聚氨酯进行了结构表征与性能测试。FTIR、DLS分析表明：DSD酸已引入到聚氨酯分子链中,随着DSD酸质量分数的增加,乳液粒径先减小后增大,当DSD酸质量分数为2%时,制备的SWPU2乳液粒径最小（44.61nm）。XRD、UV-Vis、荧光光谱结果表明：SWPU有紫外吸收且发生了红移,发出较强的蓝紫色荧光并发生浓度猝灭。与WPU相比,SWPU的力学性能及热稳定性明显提高,SWPU2荧光强度最强为434568.94 a.u.,胶膜的最大拉伸强度为48.43 MPa,断裂伸长率为389.40%;最大分解温度也由301.48℃提高到328.05℃。

A series of waterborne polyurethane prepolymers were prepared by using isophorone diisocyanate （IPDI） and polycaprolactone glycol （PCLIO00） as main raw materials, dimethylol propionic acid （DMPA） as hydrophilic chain extender. Waterborne polyurethanes （SWPU） with fluorescence were obtained with 4,4＇-diaminodiphenylethylene-2,2＇-disulfonic acid （DSD acid） as chain extender. The structure and properties of polymer were characterized by FTIR, DLS, XRD, UV-Vis, fluorescence spectra, tensile testing and thermogravimetric analysis （TGA）. The FTIR and DLS analysis showed that DSD acid were introduced into the molecular chain of SWPU, with the increase of mass fraction of DSD acid, the particle size of emulsion firstly decreased and then increased. When the mass fraction of DSD acid was 2%, the particle size of the resultant SWPU2 emulsion was 44.61 nm. The results ofXRD, UV-Vis and fluorescence spectra displayed that the prepared SWPU had an absorption to ultraviolet-visible and the absorption wavelength exhibited red shift, SWPU could emit strong blue fluorescence and the concentration quenching effect was observed. Compared with that of waterborne polyurethane （WPU）, the thermal stability, the tensile strength and the maximum decomposition temperature of SWPU2 latex film obviously improved. The strongest fluorescence intensity was 434568.94 a.u., the maximum tensile strength was 48.43 MPa and the elongation at break was 389.40%. Furthermore, the maximum decomposition temperature increased from 301.48 ℃ to 328.05℃.