高强高模维纶纤维的表面修饰及其在水泥中的分散性

Surface modification of high strength and high modulus vinylon fibre and its dispersion performance in cement

目前高强高模维纶纤维由于缺乏合理的分散方案且分散性不佳,极大地限制了在工程领域的应用。为了解决这一问题,采用聚乙烯醇磷酸酯(TFOPVA)分散剂对高强高模维纶纤维进行表面涂层改性处理,并以此为基础制备维纶纤维/水泥基复合材料。利用X射线光电子能谱仪(XPS)、场发射扫描电子显微镜(SEM)、万能材料试验机、纤维强伸度仪(XQ-1A)等对改性前后的维纶纤维的分散性及其复合材料的力学性能进行测试和表征。结果表明:当TFOPVA上浆质量分数和吸附量分别为1%和5mg/g时纤维分散效果最佳;维纶纤维短丝在水泥基体中的分散系数提高33.3%;TFOPVA处理后的维纶纤维单丝断裂强度增加4.5%,与维纶纤维之间能牢固结合;TFOPVA改性后的维纶纤维/水泥复合材料的抗压强度和抗折强度相比改性前分别提高了27.9%和21.2%。

The application of high strength and high modulus Vinylon fibre in engineering was limited due to the lack of reasonable dispersion scheme and poor dispersion. In order to solve this problem, the surface of high strength and high modulus Vinylon fibre was modified with polyvinyl alcohol phosphate ester(TFOPVA) dispersant. On this basis, Vinylon fibres/cement composites were prepared with cement as matrix. In addition, the dispersion and mechanical properties of Vinylon fibre and composites after TFOPVA sizing agent were investigated by X-ray photoelectron spectrometer(XPS), field emission scanning electron microscope(SEM), universal material testing machine, fibre strength and extensibility meter(XQ-1 A), and so on. The results confirmed that the optimum mass fraction and adsorption capacity were 1% and 5 mg/g, respectively;the dispersion coefficient of Vinylon fibre staple in cement matrix was increased by 33.3% and the monofilament breaking strength of Vinylon fibre was increased slightly by4.5%, which could be firmly bonded with Vinylon fibre. Furthermore, the compression strength and flexural strength of modified Vinylon fibre/cement resin composite increased by 27.9% and 21.2%,respectively as compared with unmodified one.