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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
作者:刘建忠 1 2 张丽辉1 2 李长风1 2 刘加平1 2 
单位:1. 高性能土木工程材料国家重点实验室江苏省建筑科学研究院 南京210008  2. 江苏苏博特新材料股份有限公司 南京211103 
关键词:聚乙烯醇纤维 分散性 荧光分析技术 分散剂 
分类号:TU528
出版年,卷(期):页码:2015,43(8):0-0
DOI:10.14062/j.issn.0454-5648.2015.08.01
摘要:

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415~460 nm 480~540 nm,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;采用同掺法和搅拌时间6 min,再掺入分散剂可使PVA 纤维(长度12 mm、直径27 μm、体积掺量0.3%)FRCC 中的有效利用率较基准提高了32.9%.

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 To clarify the dispersive characterization of fibers in polyvinyl alcohol (PVA) fiber cement composites, the fluorescencecharacteristics and image of PVA fibers in the PVA fiber cement composites were determined by fluorescence spectrometer andfluorescence microscope coupled with image-processing software, respectively. The influences of mixing method, aspect ratio andvolume fraction of fibers and dispersing agent on the dispersion of PVA fibers were investigated. The experimental results show thatthe optimum wavelength ranges of excitation and emission wave of PVA fibers are 415 -460 nm and 480 -540 nm, respectively. Thus,a GFP filter can be chosen for fluorescence image analysis. Also, the dispersion of PVA fibers was quantitatively evaluated by thedistribution coefficient and effective utilization percentage in the fluorescence microscopy technique based on fluorescence imageanalysis. Compared to the control sample in the absence of a dispersing agent, the effective utilization percentage of fibers with 12mm length, 27 μm diameters and 0.3% volume fraction in the PVA fiber cement composites in the presence of a dispersing agent afterthe synchronous mixing for 6 min is increased by 32.9%.

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基金项目:
国家自然科学基金重点项目(51438003);江苏省科技计划青年基金项目(BK20141012)。
作者简介:
第一作者:刘建忠(1976—),男,博士,教授级高级工程师。
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