摘要
利用辐射交联技术和超临界二氧化碳发泡技术,成功地制备了具有微孔结构的交联聚乙烯泡沫材料,并使用差示扫描量热仪(DSC)和扫描电子显微镜(SEM)对交联聚乙烯的熔点、结晶度以及泡沫的微孔形貌进行了表征。研究了吸收剂量、发泡温度和饱和压力对泡孔结构的影响。实验发现,吸收剂量为50kGy时交联聚乙烯泡沫具有最精细的泡孔结构;发泡温度越高交联聚乙烯泡沫的孔径越大、孔密度越小;饱和压力越高,泡沫的孔径越小、孔密度越大。聚乙烯经过辐照交联后热稳定性显著提高,发泡温度范围明显增加。
The radiation cross-linked low-density polyethylene （LDPE） foams have been formed by use of supercritical carbon dioxide （scCO2） as a blowing agent at a batch scale. The effect of irradiation with different radiation doses on melt temperature and crystallization of LDPE has been characterized by a differential scanning calorimeter （DSC）. The morphology of resulting microcellular structures has been investigated by scanning eleclron microscopy （SEM）. The effects of radiation dose, lreated temperature and pressure on morphology of the radiation cross-linked LDPE foams are studied in detail. The optimum radiation dose for the foaming of LDPE is found to be 50 kGy. Higher foaming temperature results in larger cell size and lower cell density, while higher saturation pressure leads to smaller cell size and higher cell density. Furthermore, the radiation cross-linked LDPE shows an improved thermal stability and foamability in comparison with the original LDPE.
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
北大核心
2008年第4期193-198,共6页
Journal of Radiation Research and Radiation Processing
关键词
低密度聚乙烯
超临界二氧化碳
辐照
微孔泡沫
Low-density polyethylene, Supercritical carbon dioxide, Radiation, Microcellular foam
