Abstract
Polyethylene (PE) foams, which constitute a large share of the total production of thermoplastic foams worldwide, are mainly derived from low density PE (LDPE). In this study, linear low-density PE (LLDPE), with its good mechanical properties but inferior foamability, was blended with LDPE by twin-screw compounding at varying mass ratios of 0/100, 5/95, 15/85, 25/75, and 100/0. Differential scanning calorimetry and small amplitude oscillation shear tests confirmed the compatibility of the blends. A high-pressure rheometer was used to measure the rheological properties of the blends under different CO2 pressures with the aid of a homemade fixture. Gotsis’ model was applied to correlate the rheological data for the blends and obtain their characteristic relaxation time and rigid modulus, which were then substituted into the bubble growth and stability model for numerical simulation. Referring to Considère criterion, it was found that the LLDPE/LDPE blends with a mass ratio of 5/95 possessed the best foamability, and the characteristic relaxation time had a significant effect on the foamability. Batch melt foaming experiments also confirmed the simulation results.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
