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第一章建筑密封剂功能、分类及技术要求第二章建筑密封剂的制备 1.建筑密封剂的主要组成建筑密封剂是以聚合物为基础的高填充复合材料,常用的聚合物有橡胶沥青、改性沥青,聚丁烯、聚异丁烯和丁基橡胶,氯磺化聚乙烯、聚丁橡胶,聚丙烯酸酯、聚乙烯-醋酸乙烯酯共聚物,聚氨酯橡胶、聚硫橡胶、聚硅氧烷橡胶等。可单独使用、并用,或用其他合成树脂改性。填充剂大多采用价格低廉的矿物粉,如碳酸钙、陶土、滑石粉、云母粉、膨润土等,也用炭黑、二氧化钛、白炭黑等填充补强。其他组成还有增粘剂、增塑剂、触变剂、稳定剂、着色剂、溶剂及固化(硫化)剂。密封剂组成,随聚合物不同而异。 2.建筑密封剂制造工艺 相似文献
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The persistent photoconductivity (PPC) of amorphous Hg0.78Cd0.22Te: In films has been studied under illumination by super-bandgap light (a He-Ne laser, hν=1.96 eV, 30 mW/cm2) and sub-bandgap light (1000 K Blackbody source, the largest photon energies hνp=0.42 eV, 8.9 mW/cm2) in the range of 80-300 K. The persistent photoconductivity effect increases with increase in illumination intensity and illumination time. However, it decreases with increase in working temperature. The non-exponential decay of photoconductivity implies the presence of continuous distribution of defect states in amorphous Hg0.78Cd0.22Te: In films. These results indicate that the decay of photoconductivity is not governed by the carrier trapped in the intrinsic defects, but it may be due to light-induced defects under light illumination. 相似文献
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