挤压
聚酰胺
滑石
复合材料
超临界流体
材料科学
复合数
塑料挤出
结晶
膨胀率
反应挤出
等温过程
流变学
化学工程
化学
物理
有机化学
工程类
热力学
作者
Menglong Xu,Huan Liu,Yukai Ge,Changzhi Zhao,Linfeng Wei,Dongdong Hu,Tao Liu,Ling Zhang,Liang Zhao,Chul Park
标识
DOI:10.1016/j.supflu.2023.105953
摘要
In this study, by introducing the long-chain branched (LCB) structure into the polyamide 6 (PA6) matrix, low-density microcellular PA6 composite foams with favorable cell morphology were prepared using supercritical CO2 extrusion foaming. PA6/talc composites with varying degrees of LCB were prepared using a twin-screw extruder. Rheological tests showed that the LCB-4.0 T sample with an ultra-high LCB degree had more apparent strain-hardening behavior and higher instantaneous elongational viscosity of 4.40 × 108 Pa·s. Isothermal crystallization tests revealed that LCB-4.0 T had lower crystallization rate. The effect of the degree of LCB on the gas solubility of CO2 in the PA6 composites was also examined. The foamability of the PA6/talc composites was verified via continuous extrusion foaming. High-performance PA6 composite foams with an average cell size as low as 66.7 µm, cell density as high as 2.53 × 107 cells/cm3, expansion ratio as high as 11.8, and foaming temperature window as wide as 16 °C were successfully obtained.
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