Internal Stresses, Dimensional Instabilities and Molecular Orientations in PlasticsPresents the results of an investigation conducted at the former TNO Central Laboratory between 1968 and 1973, and also includes more recent data from the literature and the results of ground-breaking research. Increasing demands on precision injection molding, from more stringent requirements, with respect to dimensional and shape stability, to attempts to build Computer Aided Design programs that link processing conditions and product properties, have necessitated a book such as this. Topics discussed range from linear viscoelastic theory to the origin of cooling stresses, to the definition of orientation. |
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according to Eq amorphous polymers anisotropy annealing behaviour birefringence calculated changes Chapter CHMA clamp conditions above Tg Consequently consider cooling stresses creep compliance curve dashpot decrease deformation conditions deformation temperature degree of orientation denotes dimensional instability effect equal equation factor Figure frozen-in entropic stresses frozen-in strain frozen-in twist function given in Fig glass temperature glass transition glass-rubber transition glassy polymer heat conductivity heating increases internal stresses isothermal large frozen-in linear m²/N measured molecular N/m² negative thermal expansion obtain parameter plot PMMA predicted PVC-Et-VA quenched ratio recovery residual stress rigid PVC rubber elasticity sample shear modulus shift shown in Fig shrinkage stress simple shear sin² specimen stretching Struik surface T₁ Table temp temperature T1 tests thermal expansion thermal stresses thermal twisting thermorheological simplicity torque torsion angle unloading volume-relaxation Young's modulus zero Δη
References to this book
Structure Development During Polymer Processing António M. Cunha,Stoyko Fakirov No preview available - 2000 |