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• W11993375 endingPage "70" @default.
• W11993375 startingPage "1" @default.
• W11993375 abstract "In this review the preparation, structure and properties of ultra-high modulus polyolefins are discussed. First, detailed consideration is given to the preparation of ultra-high modulus polyethylene and polypropylene fibres by spinning from dilute solution and by gel-spinning and hot drawing. This is followed by an account of the tensile drawing procedures which have led to the production of high modulus fibres and films in polyethylene, polypropylene and polyoxymethylene. Finally, consideration is given in the production of high modulus solid section products (rod, sheet and tube) in all these polymers by ram extrusion, hydrostatic extrusion and die-drawing. It is concluded that in these different processing routes the overriding consideration is to achieve very high extensional deformation at a molecular level. The structure of the initial isotropic polymer is therefore of key importance, the essential requirement being an adequate but not restrictive number of molecular entanglements, so that the molecular network can be stretched effectively to very high draw ratios and give very high molecular orientation. Molecular weight and morphology are therefore important, together with the drawing conditions which must permit sufficient mobility for the chains to move freely between network entanglements. Following a review of present structural understanding of these highly oriented polymers, a detailed account is presented of mechanical behaviour, including dynamic mechanical relaxations, creep and strength. This is followed by discussion of thermal properties (melting behaviour, thermal conductivity, thermal expansion, shrinkage) and barrier properties (permeability to liquids and gases, solubility). It is of some practical importance that the improvements in stiffness and stength are accompanied by substantial improvements in thermal stability, in barrier properties and in chemical resistance." @default.
• W11993375 created "2016-06-24" @default.
• W11993375 creator A5065189669 @default.
• W11993375 date "1985-01-01" @default.
• W11993375 modified "2023-10-15" @default.
• W11993375 title "The preparation, structure and properties of ultra-high modulus flexible polymers" @default.
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