Establishing a new method of foaming process using ultrasonic

本研究旨在阐明超声辐照对泡沫的影响。超临界二氧化碳溶解在样品中。在热水中（温度略低于PS的Tg）通过超声波照射进行发泡，使有效的超声波传播到样品中。我们使用非晶聚苯乙烯（a- ps）作为样品，因为超声波会影响结晶。凹形振动器可以将超声波聚焦在样品上，与平面振动器相比，凹形振动器提高了细胞数密度。凹形振动器的使用使不同大小的细胞在层中排列。

This study is to clarify the influence of ultrasonic irradiation on foaming.The supercritical carbon dioxide was dissolved into the sample.Foaming was carried out in the hot water (temperature was slightly lower than Tg of PS) by irradiating ultrasonic in order to propagate effective ultrasonic to the sample.We used amorphous polystyrene (a-PS) as a sample because ultrasonic can affect the crystallization. The concave vibrator which can focus ultrasonic wave on the sample enhanced cell number density in comparison with the planar vibrator.The use of concave vibrator caused arrangement of cells with different size in laminae.