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Investigation on the cell nucleation and cell growth in microcellular foaming by means of temperature quenching

机译:温度猝灭研究微孔泡沫中的细胞成核和细胞生长

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The cell nucleation and real-time cell growth with increasing cell growth time in microcellular foaming were investigated by means of temperature quenching in a supercritical CO2 pressure-quench process. Samples of uniform size and shape were saturated in a vessel under conditions of 100 - 180degreesC and 30 MPa, and then depressurized to the atmosphere in 10 s. After depressurization, these samples were removed from the vessel at prescribed intervals, and immediately immersed in an ice-water slurry to obtain foamed samples with various cell growth times. It was found that the nucleation density is closely correlated to the gas absorption capacity of the polymer matrix, so that the final cell density should not be adopted as the nucleation density, as done commonly. The change of cell structure and mass density with increasing cell growth time was dominated by gas diffusion behavior, which was strongly influenced by the temperature. The final cell structure was mainly determined by the cell growth step, where gas diffusion played a key role. The final cell density was in direct proportion to the gas remaining in the substrate, which ranged from 6.0 x 10(9) to 4.7 x 10(6) cells/cm(3). (C) 2004 Wiley Periodicals, Inc.
机译:通过超临界CO2压力淬火过程中的温度淬灭研究了微孔泡沫中细胞成核和实时细胞生长随细胞生长时间的增加。尺寸和形状均匀的样品在100-180℃和30 MPa的条件下浸入容器中,然后在10 s内减压到大气中。减压后,以规定的时间间隔从容器中取出这些样品,并立即浸入冰水浆中,以获得具有不同细胞生长时间的泡沫样品。发现成核密度与聚合物基体的气体吸收能力紧密相关,因此不应像通常那样将最终的细胞密度用作成核密度。随着气体生长时间的增加,细胞结构和质量密度的变化主要受气体扩散行为的影响,而气体扩散行为受温度的强烈影响。最终的细胞结构主要由细胞生长步骤决定,其中气体扩散起着关键作用。最终的电池密度与残留在基板中的气体成正比,范围从6.0 x 10(9)到4.7 x 10(6)个/ cm(3)。 (C)2004年Wiley Periodicals,Inc.

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