多巴胺改性与超声分散处理对PET纤维及其水泥基材料性能的影响研究
Study on effects of dopamine modification and ultrasonic dispersion treatment on the properties of PET fiber and its cement-based materials
关键词：
表面改性；超声分散；聚对苯二甲酸乙二醇酯（PET）纤维；多巴胺；水泥基材料；力学性能
Key words：
Surface modification; Ultrasonic dispersion; Polyethylene terephthalate (PET) fiber; Dopamine; Cement-based material; Mechanical property
刊期：
2026年第3期
DOI：
10.19761/j.1000-4637.24110568
文章编号：
基金项目：
广东省自然科学基金-面上项目（2023A1515012136）；深圳市科技计划基础研究-面上项目（JCYJ20230808105109018）。
作者：
龙武剑1，赵泰淇1，罗启灵1， *，平 扬2
单位：
1.深圳大学 土木与交通工程学院，广东 深圳 518061；2.中电建中电建生态环境集团有限公司，广东 深圳 518102
摘要
摘 要：配制了浓度为2 g/L的盐酸多巴胺改性溶液，并配合超声分散法对聚对苯二甲酸乙二醇酯（Polyethylene terephthalate，PET）纤维进行了表面改性处理，研究了浸泡改性时间（0、24、48、72 h）和超声分散处理对PET纤维及其水泥基材料性能的影响。结果表明：随着浸泡改性时间的延长，PET纤维表面的多巴胺沉积量增多，亲水性增强，掺改性PET纤维水泥基材料的力学性能提升；在浸泡改性基础上，辅以超声分散处理，可有效提高PET纤维的亲水性，增强其与水泥基体的界面结合力，进而提高水泥基材料的抗压和抗折强度。研究成果可为表面改性技术的应用及纤维增强混凝土性能的优化提供参考。
Abstract: In order to investigate the effects of different modification times and ultrasonic dispersion treatment on the microstructure and functional properties of hydrochloride dopamine modified polyethylene terephthalate (PET) fibers, and further analyze their improvement effect on the properties of cement-based materials, a hydrochloride dopamine-modified solution with a concentration of 2 g/L was prepared, and the surface modification treatment was carried out on PET fibers using ultrasonic dispersion method. The effects of immersion modification time (0, 24, 48, 72 h) and ultrasonic dispersion treatment on the properties of PET fiber and its cement-based materials were investigated. The results show that, as the immersion modification time increases, the dopamine deposition on the surface of PET fiber increases, the hydrophilicity is enhanced, and the mechanical properties of cement-based materials doped with modified PET fiber are improved. Additionally, supplementary ultrasonic dispersion treatment further enhances the hydrophilicity of PET fiber and strengthens the interfacial bonding with the cement matrix, thereby improving the compressive strength and flexural strength of the cement-based materials. The research results can provide reference for the application of surface modification technology and the optimization of fiber reinforced concrete performance.
结论
（1）改性时间和超声波处理显著影响PET纤维的表面形貌。随着改性时间的延长，PET纤维的颜色变深，表面形成更多的多巴胺沉积，表面粗糙度增大；超声波处理可促进多巴胺在纤维表面均匀分布，改善纤维表面性能。
（2）改性处理显著提升了PET纤维的亲水性。其中，MF72纤维的亲水性最佳，超声分散+浸泡改性的CMF24纤维的亲水性次之，MF48纤维的亲水性最差，表明适当延长改性时间或辅以超声波处理均能有效增强纤维的亲水性。
（3）不同PET纤维改性方式均提升了水泥基材料的抗压、抗折强度，且提升幅度随着改性时间的延长和超声分散处理的引入而增加。
（4）总体而言，72 h浸泡改性最有利于提升PET纤维的表面性能，提升其与水泥基体的界面结合力，从而提高水泥基材料的力学性能。另外，超声波处理能够促进多巴胺均匀沉积，是一种高效的辅助改性方法，这为PET纤维在混凝土工程中的应用提供了一定的技术支持。
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引用本文
龙武剑,赵泰淇,罗启灵,等.多巴胺改性与超声分散处理对PET纤维及其水泥基材料性能的影响研究[J].混凝土与水泥制品,2026,53(3):42-46. LONG W J,ZHAO T Q,LUO Q L,et al.Study on effects of dopamine modification and ultrasonic dispersion treatment on the properties of PET fiber and its cement-based materials[J].China Concrete and Cement Products,2026,53(3):42-46 (in Chinese).
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