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Quantitative molecular characterization of cold-drawn semi-crystalline polymers. Case of polyethylene terephthalate |
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| Affiliation: | Laboratoire de Structure et Propriétés de l''Etat Solide, L.A. 234, Université des Sciences et Techniques de Lille, 59655 Villeneuve d''Aseq, Cedex, France;Escuela Técnica Superior de Ingeniería Aeronáutica y del Espacio, Universidad Politécnica de Madrid, Plaza Cardenal Cisneros, 3, 28040-Madrid, Spain |
| Abstract: | The influence of pre-orientation on the natural draw ratio achieved in necking has been studied for poly(ethylene terephthalate). The results are analysed with the aid of the non-Gaussian theory of rubber elasticity assuming that the amorphous phase behaves as a network formed by entanglements of chains. A model for separating the influence of amorphous and strain-induced crystalline regions on deformation is proposed and compared with the pseudo-affine model. |
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