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Functionalized poly(propylene-co-ethylene) (PPE) made via reactive extrusion dramatically improved the performance of their blends with poly(methyl methacrylate) (PMMA). Adhesion, compatibility, modulus, hardness and scratch resistance were all increased for blends with functional PPEs compared to non-modified PPE, greatly expanding the applications of polyolefins. Three types of functional PPEs including...
Polyethylene (PE) has relatively poor adhesion with polar polymeric materials. In an effort to improve the adhesion between PE and thermoplastic polyurethane (TPU), maleic anhydride (MA), hydroxyl (OH), and secondary amine (NHR) functionalized PEs were blended into nonmodified PE. These functional groups will react with urethane linkages in TPU at the temperature of melt processing. We bonded these...
A visible trend in the area of food packaging is the ever-increasing substitution of thermoplastics for traditional materials such as glass and metal. In general, plastic packaging materials offer less breakage, lighter weight and a degree of design flexibility that glass and metal cannot provide. However, plastic materials are inherently permeable to gases such as oxygen, carbon dioxide and water...
Dynamic plane-stress failure has been observed directly in the transmission electron microscope as a function of temperature using a commercially available cooling/straining holder in conjunction with a copper deformation cartridge. The low-temperature cooling stage permits studies of the ductile-brittle transition when the transition is between +23 and -170°C. A change in deformation mode was observed...
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