水性聚氨酯/纳米二氧化硅杂化材料的制备及性能

以三羟甲基丙烷(TMP)为内交联剂,合成了一种内交联的水性聚氨酯(WPU)预聚体,以KH550为偶联剂,加入亲水型纳米二氧化硅(A200),通过溶胶-凝胶过程合成了一种水性聚氨酯/纳米二氧化硅杂化材料(PUSi).通过红外光谱(FT-IR)、热重分析(TG)和透射电镜(TEM)等测试对PUSi的结构和性能进行了研究,并...

Preparation and Properties of Polyurethane/Silica Hybrid Emulsion

Polyurethane prepolymer was synthesized with trimethylolpropane(TMP) as crosslinker,and hydrophilic nano-sized silica(A200) was added to the prepolymer with KH550 as coupling agent,then waterborne polyurethane/nano-silica hybrids(PUSi) was obtained by a sol-gel process.Solidified films of the waterborne polyurethane were prepared by casting emulsions on Teflon surfaces.The structure and performance of the PUSi films were studied by Fourier transform infrared spectrum(FT-IR) and thermogravimetric analysis(TGA).The effects of A200 on the particle size and morphology of PUSi hybrid emulsion were studied.FT-IR analysis indicates the formation of chemical bond between waterborne polyurethane(WPU) and A200.TG indicates that A200 can improve thermal stability of PUSi films.As the mass fraction of A200 increases from 0%to 2.5%,the particle size of emulsion increases from 80.3 nm to 152.1 nm,the tensile strength of the films increases from 8.5 MPa to 23.6 MPa,water absorption of films decreases,and the hardness is also improved.