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首页> 外文期刊>Journal of Applied Polymer Science >Poly(dimethylsiloxane)-toughened syntactic foams
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Poly(dimethylsiloxane)-toughened syntactic foams

机译：聚（二甲基硅氧烷） - 结块局部泡沫

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The potential of preformed elastomers as a toughening agent for epoxy-glass syntactic foam has been explored. Poly(dimethylsiloxane) microspheres were prepared by suspension polymerization. The microsphere dimensions could be varied from 58 to 255 mm by tuning the reaction parameters, particularly the stirring speed and feed concentration. Rheological studies indicated that the introduction of microballoons led to an increase in the viscosity of the resin, with the extent being proportional to the microballoon content. The zero shear viscosity increased from similar to 10(3) mPa s at 30 degrees C to 10(5) mPa s as the microballoon loading was increased to 40%. Syntactic foams containing varying amounts of microballoons (40-60% v/v) were prepared, and an analogous set of toughened foams were also prepared, where a fraction of the microballoons was replaced with poly(dimethylsiloxane) microspheres (3-7%). The effect of increasing dimensions of the elastomeric microspheres on the mechanical properties was also studied. The improvement in properties was more pronounced when the microsphere size was equivalent to that of the constituent microballoons. An improvement of 40% and 185% in flexural strength and flexural toughness was observed upon the introduction of poly(dimethylsiloxane) microspheres of optimal dimensions (diameter similar to 63 mm, 5% loading), without any undesirable increase in foam density. However, the compressive properties remained practically unaltered. (C) 2017 Wiley Periodicals, Inc.
机译：已经探讨了预成型弹性体作为环氧玻璃局部泡沫的增韧剂的潜力。通过悬浮聚合制备聚（二甲基硅氧烷）微球。通过调节反应参数，特别是搅拌速度和进料浓度，微球尺寸可以从58〜255mm变化。流变研究表明，引入微量球菌导致树脂粘度的增加，范围与微金含量成比例。随着微量载荷载荷增加至40％，零剪切粘度从相似的10（3）MPa S类似于10（3）MPa S至10（5）MPa S.制备含有不同量的微球（40-60％v / v）的句法泡沫，还制备了类似的泡沫泡沫，其中将微量硅胶部分替换为聚（二甲基硅氧烷）微球（3-7％） 。还研究了弹性体微球的增加对机械性能的影响。当微球尺寸相当于组分微旋钮的时，性质的改善更加明显。在引入聚（二甲基硅氧烷）的最佳尺寸（直径与63mm，5％负载）的情况下，观察到弯曲强度和抗弯曲韧性的40％和185％的改善，而没有任何不希望的泡沫密度增加。然而，压缩性质仍然仍未妨碍。 （c）2017 Wiley期刊，Inc。

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