Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
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L. Capt
Abstract
The melting and simultaneous biaxial stretching behavior of three Ziegler-Natta isotactic polypropylene resins of varying isotacticity was studied. DSC melting experiments showed that the crystallinity and melt stability of the crystalline phase depend strongly on tacticity and on the degree of undermelting, ΔT = Tm – T, where Tm is the melting temperature. The level of biaxial yield stress depends on the fraction of residual “unmolten” crystallinity and the crystallite size. For specimens with same thermal history, the post-yield deformation shows strong dependence on the degree of undermelting, ΔT. The deformation homogeneity and the resulting film thickness may be related to the thermal mobility of the chains and the tie chain and entanglement densities.
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© 2005, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- New at International Polymer Processing
- Regular Contributed Articles
- Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
- Non-linear Viscoelastic Behavior of PVC Plastisol
- Algorithms for Two Gate Optimization in Injection Molding
- Viscoelastic Properties of Flexible Organic Fiber Composites
- Mold for Manipulation Microstructure Development
- Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
- Rotational Moulding of PVC Plastisol
- Drawability of As-spun PP Fibres
- Melt Fracture of Linear PE
- Investigation of the Cooling Jets Used in the Blown Film Process
- Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
- Design Sensitivity Analysis for the Optimization of the Injection Molding Process
- Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
- Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- New at International Polymer Processing
- Regular Contributed Articles
- Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
- Non-linear Viscoelastic Behavior of PVC Plastisol
- Algorithms for Two Gate Optimization in Injection Molding
- Viscoelastic Properties of Flexible Organic Fiber Composites
- Mold for Manipulation Microstructure Development
- Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
- Rotational Moulding of PVC Plastisol
- Drawability of As-spun PP Fibres
- Melt Fracture of Linear PE
- Investigation of the Cooling Jets Used in the Blown Film Process
- Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
- Design Sensitivity Analysis for the Optimization of the Injection Molding Process
- Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
- Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
