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研究

The Preparation and Characterization of waterborne polyurethane modified by 4,4-Diaminodiphenylethylene-2,2-disulfonic acid

摘要:

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、热重分析等手段对聚氨酯进行了结构表征与性能测试。FT-IR、DLS分析表明，4,4-二氨基二苯乙烯-2,2-二磺酸（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w（DSD酸）%=2%时，SWPU乳液的平均粒径适中(72.80 nm)。XRD、UV-vis、荧光光谱结果表明，SWPU具有明显结晶性；SWPU具有一定的紫外吸收且发生了红移；SWPU发出较强的蓝色荧光且发生浓度猝灭。与WPU相比，SWPU的力学性能及热稳定性明显提高，当w（DSD酸）%=3%时，最大拉伸强度为48.43 Mpa，断裂伸长率为366.42%；最大分解温度由301.48 ℃提高到328.05 ℃。

Abstract:

A series of waterborne polyurethane prepolymer were prepared by sophorone diisocyanate (IPDI) and polycaprolactone glycol (PCL1000) as the main raw materials, dimethylol propionic acid (DMPA) as hydrophilic chain extender. The waterborne polyurethane (SWPU) with fluorescence was obtained by 4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid (DSD acid) as chain extender. Structure and properties of polymer were characterized by FT-IR, DLS, XRD, UV-Vis, Fluorescence spectra, Tensile testing and TGA&DTG. FTIR, DLS analysis showed that DSD acid had been introduced into the molecular chain of SWPU, with the increase of the mass fraction of DSD acid, the particle size of emulsion decreases firstly and then increases. When w (DSD acid) =2%, the particle size of SWPU emulsion was 72.80 nm. The results of XRD, UV-vis and fluorescence spectra showed that SWPU had obvious crystallinity, SWPU had certain ultraviolet absorption and red shift, SWPU emit strong blue fluorescence and concentration quenching. Compared with the WPU, the thermal stability of SWPU latex film the tensile strength and the maximum decomposition temperature had improved obviously. When w (DSD acid) =3%, the maximum tensile strength was 48.43 Mpa and the elongation at break was 366.42%, the maximum decomposition temperature from 301.48 ℃ to 328.05 ℃.