CAJ | 학술논문

使用超临界CO2流体作为发泡剂在不同条件下制得一系列微孔聚碳酸酯(PC)。通过扫描电子显微镜观察分析了各种制备工艺参数对微孔PC泡孔结构和分布的影响。结果表明，饱和阶段的时间超过3.5 h时，试样中的CO2基本达到饱和；饱和阶段压力的增加会使泡孔直径减小，泡孔密度增大；而发泡温度的增加和发泡时间的延长则会使泡孔直径增大，泡孔密度减小。当完全发泡时，试样的泡孔结构在厚度方向上有明显区别：试样表皮部分未发泡，有致密的表皮结构；试样表层附近泡孔直径较小，泡孔密度较大；试样中心处的泡孔直径较大，泡孔密度较小。
사용초림계CO2류체작위발포제재불동조건하제득일계렬미공취탄산지(PC)。통과소묘전자현미경관찰분석료각충제비공예삼수대미공PC포공결구화분포적영향。결과표명，포화계단적시간초과3.5 h시，시양중적CO2기본체도포화；포화계단압력적증가회사포공직경감소，포공밀도증대；이발포온도적증가화발포시간적연장칙회사포공직경증대，포공밀도감소。당완전발포시，시양적포공결구재후도방향상유명현구별：시양표피부분미발포，유치밀적표피결구；시양표층부근포공직경교소，포공밀도교대；시양중심처적포공직경교대，포공밀도교소。
A series of microcellular polycarbonate foam were prepared using supercritical CO2 as the foaming agent under different preparation conditions.The effects of process parameters on the cell structure and cell distribution were analyzed with the graphs observed by scanning electron microscopy.The results show that CO2 is almost saturated in the specimen when the time of saturation stage is more than 3.5 h.With the pressure of saturation stage increasing,the cell diameter is reduced and the cell density is increased.Differently,when the foaming temperature or the foaming time increases,the cell diameter is increased and the cell density is reduced.The completely foamed specimen has a significant difference of the cell structure in the thickness direction.The scarfskin of the specimen is unfoamed with dense epidermal structure,and the surface layers of the specimen have larger cell diameter and smaller cell density than the central layer.