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用预聚物分散 -原位聚合法合成了聚氨酯脲 -丙烯酸酯(PUA)水分散液。用ATR -FTIR和ESCA技术表征了PUA水分散液在玻璃基材上成膜后的表面结构和组成 ,测定了不同液体在PUA膜表面上的接触角及PUA膜的耐磨性。结果表明,PUA成膜时与空气接触面和与玻璃接触面的表面组成和耐磨性接近于聚氨酯脲(PUU)的表面特性。此外 ,在PUA膜中PUU和聚丙烯酸酯的组成呈“双向梯度”分布 ,即在沿膜的2个表面方向PUU的含量均逐渐增加 ,而聚丙烯酸酯的含量逐渐降低。根据观察到的实验现象 ,探讨了PUA水分散液的成膜机理。
Polyurethaneurea - acrylate (PUA) aqueous dispersions were synthesized by prepolymer dispersion - in situ polymerization. The surface structure and composition of PUA aqueous dispersions on glass substrates were characterized by ATR-FTIR and ESCA techniques. The contact angles of PUA films and the abrasion resistance of PUA films were measured. The results show that the surface composition and abrasion resistance of PUA at the contact surface with air and with glass are similar to the surface properties of PUU. In addition, the composition of PUU and polyacrylate in PUA film showed a “two-way gradient” distribution, that is, the content of PUU gradually increased along the two surfaces along the membrane, while the content of polyacrylate gradually decreased. According to the observed experimental phenomena, the film forming mechanism of PUA aqueous dispersion was discussed.