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聚乙烯醇纤维在水泥基复合材料中的分散性表征及调控

DOI: 10.14062/j.issn.0454-5648.2015.08.07

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Abstract:

为了建立聚乙烯醇(PVA)纤维在水泥基复合材料(FRCC)中的分散性表征技术和调控方法,采用荧光光谱仪和荧光显微镜+图像分析软件分别对PVA纤维的荧光特性及其在FRCC中的荧光图像进行获取和分析,再研究搅拌工艺、纤维长径比及体积掺量、分散剂对PVA纤维分散性的影响。结果表明PVA纤维最佳激发和发射波长范围分别为415~460nm及480~540nm,荧光图像获取时应选择绿色荧光蛋白(GFP)滤波器;基于荧光图像分析,建立荧光分析技术,利用纤维分散系数和有效利用率两个评价指标对PVA纤维的分散性能进行定量表征;采用同掺法搅拌6min后,再掺入分散剂可使PVA纤维(长度12mm、直径27μm、体积掺量0.3%)在FRCC中的有效利用率较基准提高了32.9%。

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