Blends of recycled LDPE and LDPE were prepared by the twin-screw extruder at different ratios. Recycled LDPE was used as matrix in this work, LDPE was used to improve the properties of RLDPE. Thermal and rheological properties of the blends were carefully evaluated and compared with pure LDPE. DSC measurements indicates that the RLDPE/LDPE blends are miscible in the crystalline phase and LDPE can increase the crystallization of the blends. Rheological analysis shows that virgin LDPE will promote the normal flow of RLDPE and improve the mobility of chain segments in flow. Consequently, the rheological and processing properties of the blends have improved compared to RLDPE. The blends show potential applications in high-value products.
Hollow microspheres with less than 1 millimeter in diameter and several micrometers in wall thickness are attractive for hydrogen storage and transportation. The hollow microspheres can be made by drop tower technique, microencapsulation and vapor deposition methods. By immersion in high pressure hydrogen for a period of time at elevated temperature, the hollow microspheres can be filed with hydrogen gas at pressures up to one hundred MPa. The hydrogen mass fraction can be varied from 1% to 10% for hollow microspheres with different membrane hoop stress at failure.
Blends of recycled LDPE and LLDPE were prepared by the twin-screw extruder at different ratios. Recycled LDPE was used as matrix in this work, LLDPE was used to improve the properties of RLDPE. Virgin LDPE was used in this study as a contrast. Rheological properties of the blends were carefully evaluated by a Haake rheometer and compared with pure LDPE. Rheological analysis shows that virgin LLDPE will promote the normal flow of RLDPE in the a large content and hinder the mobility of chain segments when in a small content of LLDPE. Consequently, the blends show potential applications in high-value products.
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