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WHY IS RUBBER ELASTIC?
THE MOLECULAR NETWORK
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amorphous amount bonds brittle butyl rubber calculated carbon atoms cellulose chain segments chapter chemical containing corresponding crack cross-linked crystalline polymers crystalline rubber curve density diffraction dimensions direction effect energy equilibrium example extension fibres filaments flow force fracture freezing-point depression geometrical glass-transition temperature glassy polymers heat hence Hooke's law important increase inorganic glasses isotactic kinetic length liquid measured mechanical properties melting modulus molecular orientation molecular weight natural rubber neighbouring nylon observed obtained ordinary original osmotic osmotic pressure perspex physical properties plane polyethylene polymer molecule polymeric polypropylene polystyrene polythene pressure produced proportional rate of crystallization rayon relation repeating unit represented result rotation rubber elasticity rubber-like shear stress shown in fig similar single crystal solid solution specimen strain stretched structure surface synthetic tensile stress Terylene theoretical theory thermal tion transition unit cell unstrained vapour viscose rayon viscosity volume vulcanized rubber X-ray yarn