摘要
以超临界CO2为物理发泡剂通过固态间歇发泡法制备了不同共混比例的聚苯硫醚/聚醚醚酮(PPS/PEEK)微孔材料。采用差示扫描量热法探讨了PPS/PEEK共混物的热性能,通过扫描电子显微镜观察分析了共混组成和饱和压力对微孔材料泡孔结构与分布的影响规律,并对微孔材料的冲击强度、介电常数和动态力学性能进行了研究。结果表明,共混使PPS相和PEEK相的结晶度增大,共混物中的气体饱和浓度随着PEEK组分含量的增加而增大。与纯PPS和PEEK相比,共混物中形成致密的多级泡孔结构。饱和压力越大则微孔材料的泡孔密度越大,且泡孔尺寸越小。微孔发泡使PPS/PEEK共混物的冲击强度增大,介电常数和储能模量降低。
Microcellular foams from polyphenylene sulfide/poly(ether-ether-ketone) (PPS/PEEK) blends with various blend ratios using the solid-state batch foaming technique with supercritical CO2 as a physical-blowing agent. The thermal properties were discussed by using differential scanning calorimetry, and the effects of blend composition and saturation pressure on the cellular structure and distribution were analyzed with the graphs observed by scanning electronic microscopy. The impact strength, dielectric constant and dynamic mechanical properties "of the microcellular foams were also investigated. The results show that blending increase the crystallinities of PPS and PEEK phases. The gas concentration in the PPS / PEEK blends increases with the improved PEEK content. Compared with pure PPS and PEEK, the PPS/PEEK blends exhibit hierarchical cellular structures. The cell density increases and the cell size decreases with the increasing saturation pressure. Microcellular foaming improves the impact strength, and decreases the dielectric constant and storage modulus of PPS/PEEK b/ends.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第6期16-21,共6页
Engineering Plastics Application