Bifunctional coupling agents for improved mechanical properties in fiberglass/polyethylene composites

关键词 Composite materials;Glass fibers;Polyethylenes;Tensile properties;Chemical bonds;Fourier transform infrared spectroscopy;Nuclear magnetic resonance spectroscopy;Decomposition;Ultraviolet radiation;Molecules;Extrusion摘　　要Two bifunctional compounds, 12-azido-1-diazo-2-dodecanone (A) and 1-diazo-17-octadecene-2-one (B), show an ability to act as coupling agents in fiberglass/polyethylene composites.Under appropriate conditions the diazoketone functional groups in both A and B react with hydroxyl groups on a fiberglass surface, whereas the azide group in A and the alkene group in B form bonds with the plastic matrix during processing.FTIR and NMR spectroscopy were used to study the decomposition of each of these compounds under heat and UV light.Each treatment resulted in a relatively fast decomposition of the diazoketone functional group, along with a slower reaction of the azide and alkene groups.Thus it was possible to react the diazoketone end of these compounds with a fiberglass surface, without affecting the azide or alkene functional groups on the other ends of the molecules.In samples of treated fiberglass containing compounds A or B and mixed by extrusion with polyethylene, the mechanical properties of the composites had improved properties over composites containing untreated samples of fiberglass.With A as the coupling agent, both the tensile properties and Izod impact showed changes that indicated that a bifunctional bridge was formed between the fiberglass and polyethylene phases.

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