A theory of necking in semi-crystalline polymers

Characterization of Semi-crystalline Polymers Using MRI

H single point magnetic resonance imaging (SPI)[1],[2],[3] has been introduced in the literature as a method for determining relaxation characteristics of semi-crystalline polymers and for extracting MRI images from such samples. The work presented in the literature to date demonstrates the applicability of this technique. In this work, SPI has been applied to the direct observation of stress-i...

Multiscale Modeling of the Deformation of Semi-crystalline Polymers

A computational model for processing of semi-crystalline polymers: The effects of flow-induced crystallization

A computational model for the combined processes of quiescent and flowinduced crystallization of polymers is presented. This modelling should provide the necessary input data, in terms of the structure distribution in a product, for the prediction of mechanical properties and shapeand dimensional-stability. Rather then the shear rate as the driving force, a viscoelastic approach is proposed, wh...

A Phase Field Technique for Modeling and Predicting Flow Induced Crystallization Morphology of Semi-Crystalline Polymers

Abstract: Flow induced crystallization of semi-crystalline polymers is an important issue in polymer science and engineering because the changes in morphology strongly affect the properties of polymer materials. In this study, a phase field technique considering polymer characteristics was established for modeling and predicting the resulting morphologies. The considered crystallization process...

Rheology of liquid crystalline polymers

Concepts which may be used in interpreting the complex rheology of liquid crystalline polymers are reviewed. Some of them are taken from the nematodynamics of low molecular weight liquid crystals as described by the Leslie—Ericksen theory, others are intrinsic to the viscoelasticity of ordinary polymers. Tentatively, these concepts are used to construct an explanation of the band texture which ...