Internal Stresses, Dimensional Instabilities and Molecular Orientations in Plastics

摘要: Part 1 Dimensional instabilities due to volume relaxation: general outline of relaxation volume-relaxation data for a number polymers consequences optical and electrical properties methods reduce the effects. 2 instability stresses acting during processing: linear viscoelastic theory behaviour amorphous non-isothermal recovery large frozen-in deformation at temperatures below Tg shrinkage stresses. 3 Residual thermal rapid inhomogeneous cooling: origin cooling elementary method calulating in (generalized Aggarwala-Saibel theory) refinements test chilled flat plates calculations some other geometries. 4 Molecular orientations processing definition orientation distinction with (frozen-in) strains discussion classical picture on anisotrophy effects oriented solid experiments samples tensile strain experiemtns simple shear shearing effect twist twisting relation between conditions degree entropic