Structure development and property changes in high-density polyethylene/calcium carbonate blends during pan-milling

✍ Scribed by H. Huang

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 247 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991107)74:6<1459::aid-app19>3.0.co;2-d

✦ Synopsis

A new self-designed mechanochemical reactor, inlaid pan-mill, was used in studying high density polyethylene (HDPE) and calcium carbonate (CaCO 3 ) blends. The effects of CaCO 3 on the crushing and structure of HDPE matrix and the properties of HDPE/CaCO 3 blends were investigated. Scanning electron microscopy, Fourier transformed IR spectroscopy, dynamical mechanical testing analysis, capillary rheometer, and Instron material testing system were used to characterize the structure of HDPE and evaluate the properties of HDPE/CaCO 3 blends. The introduction of calcium carbonate during milling improved milling efficiency, and time needed for each cycle was greatly reduced. Oxygen-containing groups on HDPE chains, which were produced during milling, increased interfacial interactions and improved the dispersion and distribution of calcium carbonate particles in HDPE/CaCO 3 blends. Rheological, thermal, and mechanical properties were also improved. The elongation at break of milled blends with high concentrations of calcium carbonate was significantly higher than that of unmilled blends.