超声振动对闪光铝颜料填充HDPE复合材料流变行为和性能的影响

Effect of Ultrasonic Vibration on Rheological Behavior and Properties of Sparkling Aluminum Pigments Filled HDPE Composites

以改进的超声波辅助的转矩流变仪作为聚合物超声处理装备,测量高密度聚乙烯/闪光铝片颜料(HDPE/Al)复合材料的流变行为,并研究超声波强度对HDPE/Al复合材料的流变行为、晶体结构、结晶度和热稳定性的影响。结果表明,超声波能提高HDPE/Al复合材料的流动速率,降低表观剪切黏度与口模压力;超声波强度越大,表观剪切黏度与口模压力的下降越显著,越有利于促进聚合物熔体的流动,当超声波强度为300 W,流变仪转速为5r/min时,表观黏度下降了61%,而口模压力下降了58%;超声处理提高了HDPE/Al复合材料的结晶度并细化了晶体片层的厚度;超声波强度在200W时能够显著提高HDPE/Al复合材料的热稳定性。

The rheological behavior of high-density polyethylene （HDPE） composites （HDPE/A1） filled with sparkling aluminum pigments （AI） was measured by self-improved ultrasonically aided torque rheometer. The effects of ultrasonic intensity on rheological behavior, crystal structure, crystallinity and thermal stability of HDPE/AI composites were investigated. The results show that ultrasonic vibrations increase the flow rate of HDPE/A1 composites, and decrease the apparent shear viscosity and die pressure. The apparent shear viscosity and die pressure significantly decrease as the intensity of the ultrasonic increases. A stronger ultrasonic intensity is benefit for promoting the flow of the polymer melt. When the screw rotational speed is 5 r/min and the ultrasonic intensity is 300 W, the apparent shear viscosity decreases by 61%, while the die pressure reduces by 58%. Ultrasonic oscillations could improve the crystallinity and decrease the lamella thickness of crystals. Ultrasonic vibrations could also significantly increase the thermal stability of composites at the ultrasound intensity of 200 W.