Decrosslinking of crosslinked high‐density polyethylene via ultrasonically aided single‐screw extrusion

摘要: A novel environmentally friendly process for decrosslinking of the peroxide crosslinked HDPE (XHDPE) via ultrasonic assisted single (SSE) is developed and its characteristics are established. The specific energy decreases with flow rate increases amplitude, while die pressure amplitude. Application treatment during extrusion enables an increase productivity. Gel fraction, crosslink density, dynamic mechanical properties, thermal behavior virgin HDPE, XHDPE, decrosslinked XHDPE measured. fraction density decreased increasing unique linear relation between normalized gel found, regardless type extruders processing conditions. SEM images reveals that a composite submicron size particles embedded in sol matrix. extracted from exhibits higher complex viscosity level branching than HDPE. An amplitude leads to decrease viscosity, storage loss moduli, tangent XHDPE. properties show weak dependency on At some conditions, close or those POLYM. ENG. SCI., 54:2715–2730, 2014. © 2013 Society Plastics Engineers