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Physics Coursework In today's society we are always striving to be the biggest, fastest, strongest and most importantly loudest at everything we do. Now with the invention of the composite Hexacone the latter is certain to be achieved. Many audio engineers have now decided to manufacture speaker cones out of the aforementioned Hexacone in order to reach volumes which are unable to be achieved by paper, aluminium or polypropylene which are the commonly found in speakers today. Hexacone is used because of its very stiff and rigid properties. This is due to the fact that it is a composite made from two very strong materials in their own right. Hexacone is composed of two layers of Kevlar sandwiching a honeycomb core of Nomex. ...read more.


Its chemical name is paraphenylene terephthalamide and is made up from benzene rings, which are rings of carbon atoms joined by hydrogen molecules. Half the bonds in the rings are double bonded creating very strong strings of atoms. Kevlar's structure consists of copolymer chains that are hydrogen bonded in a plane that is pleated and aligned radially. When the fibre is pulled along its axis it stretches before the load is applied directly to the bonds in the sheet plane. Another reason for Kevlar's high strength and stiffness is in the way the material is spun, during the process of wet spinning liquid crystals form in the spinning solution and with its stiff linear molecules it causes a high degree of molecular orientation. ...read more.


This is because when the material is exposed to flame, it expands and thickens creating a protective barrier between the skin and the flame. In the context of Hexacone, Nomex is manufactured as a honeycomb core and is made from Nomex paper. Honeycomb structures are the choice core in many different applications and most famously in aviation. The interior of body on planes use honeycomb structures because it can maintain high stiffness while being very lightweight at the same time, and they are used in speaker cones to prevent any deformation at high volumes. The honeycomb is saturated with a synthetic resin called phenolic resin. This saturation process creates a crystalline cell structure within the aramid paper that improves its mechanical properties. ...read more.

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