Previous Experimental Polymer Rheology Versus Flow Induced Crystallization
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H. Janeschitz-Kriegl
Experimental results, which have mostly been obtained with the aid of flow birefringence, are quoted. For a series of polystyrenes insights are obtained into the adjustment times for steady flow. For shear rates of practical interest these times are extremely short compared with the times showing up in the relaxation time spectrum. The question arises, whether this spectrum can still be of influence. Measurements on polyethylenes are quoted, which are in agreement. But this means that, fortunately, in capillary rheometry mostly the steady state viscosity is measured. This statement also holds for duct flow, which has often been used for the investigation of shear induced crystallization, in particular on polypropylenes. The linear stress optical rule is recalled. It reflects the persistence of an internal equilibrium, which breaks down only at high enough shear rates. This equilibrium seems to hold for the random flight statistics of chain segments connecting entanglements. The mentioned adjustment times are already short, before the said break down occurs.
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© 2013, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Climatic Ageing of Components of Polymer Based Electrochromic Devices
- Previous Experimental Polymer Rheology Versus Flow Induced Crystallization
- Studies on the Effect of Pellet Size on Positive Conveying in Helically Grooved Single Screw Extruders
- Distortion of Interfaces in a Multilayer Polymer Co-extrusion Feedblock
- Preparation and Characterization of PES and PA Composite Membranes for Air Separation at Low Pressures
- Impact of Feed Opening Width and Position on PVC Extrusion Process Effectiveness
- Irradiation Strategy for Laser Transmission Welding of Thermoplastics Using High Brilliance Laser Source
- Polytetrafluoroethylene Paste Extrusion: A Fibrillation Model and Its Relation to Mechanical Properties
- Improving Weld Line Strength of Fiber Reinforced Plastics By Means of A “Flow Disruptor”
- Application of the Network Simulation Method to Flat Dies with Inverted Prelands
- In Situ Polymerization of PET in the Presence of Pristine and Organo-modified Clays
- Rapid Communications
- Accurate Bio-scaling Processing of Micro Structured Shark Skin Based on Swelling of Polydimethylsiloxane
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Climatic Ageing of Components of Polymer Based Electrochromic Devices
- Previous Experimental Polymer Rheology Versus Flow Induced Crystallization
- Studies on the Effect of Pellet Size on Positive Conveying in Helically Grooved Single Screw Extruders
- Distortion of Interfaces in a Multilayer Polymer Co-extrusion Feedblock
- Preparation and Characterization of PES and PA Composite Membranes for Air Separation at Low Pressures
- Impact of Feed Opening Width and Position on PVC Extrusion Process Effectiveness
- Irradiation Strategy for Laser Transmission Welding of Thermoplastics Using High Brilliance Laser Source
- Polytetrafluoroethylene Paste Extrusion: A Fibrillation Model and Its Relation to Mechanical Properties
- Improving Weld Line Strength of Fiber Reinforced Plastics By Means of A “Flow Disruptor”
- Application of the Network Simulation Method to Flat Dies with Inverted Prelands
- In Situ Polymerization of PET in the Presence of Pristine and Organo-modified Clays
- Rapid Communications
- Accurate Bio-scaling Processing of Micro Structured Shark Skin Based on Swelling of Polydimethylsiloxane
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei Kakou Abstracts
