Drawing of β-Crystal Nucleator-Added PP
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M. Fujiyama
Abstract
Extruded sheets were prepared from homo-isotactic poly-propylenes (PP) with 0 to 10 ppm of quinacridonequinone which is a β-crystal nucleator for PP and the characteristics of drawing behavior and properties of drawn sheets were studied. The sheet without the nucleator consisted of usual α-crystals (hereinafter called α-PP), whereas the sheets with the nucleator contained much β-crystals (hereinafter called β-PP), whose content slightly increased with increasing nucleator content. While the tensile yield stress of the β-PP is lower than that of the α-PP, the drawing stress of the former is higher than that of the latter at the higher strain region after yielding. Even after drawn, the β-crystals remain in the α-crystals with low crystallinity at low drawing temperatures. However, the β-crystals and amorphous phase gradually decrease with increasing drawing temperature, and the α-crystals dominate above 80°C. The resultant tensile modulus and strength of the drawn sheets show maxima at drawing temperatures of 40 to 80°C on a balance between the effects of crystallinity and molecular orientation. The tensile modulus and strength of drawn sheet prepared from the β-PP are higher than those prepared from the α-PP by about 10% at those temperatures. The tensile elongation of drawn sheet prepared from the β-PP is slightly higher than that prepared from the α-PP at low drawing temperatures due to the remained β-crystals.
© 1999, Carl Hanser Verlag, Munich
Articles in the same Issue
- Regular Contributed Articles
- Polymer Processing Problems from Non-Rheological Causes1
- Utilization of Rheology Control to Develop Wood-Grain Patterned PVC/Wood Flour Composites
- Screw Drive Power of Single Screw Plasticating Units With Smooth Barrels
- Design of Dispersive Mixing Devices
- Dynamic Performance of Single-Screws of Different Configurations
- A Comparative Study of Residence Time Distributions in a Kneader, Continuous Mixer, and Modular Intermeshing Co-Rotating and Counter-Rotating Twin Screw Extruders
- Influence of a ‘Rotating Tip’ on the Properties of Tubing Made Using a Cross-Head Tubing Die
- Modelling of Capillary Rheometer Data and Extrapolation of the Viscosity Function into the Linear Viscoelastic Region
- Relationship Between Structure and Spinning Processing of As-Spun PP Fibres
- Rheological and Theoretical Estimation of the Spinnability of Polyolefines
- Drawing of β-Crystal Nucleator-Added PP
- Wave Behavior in the Coating Process of Multilayer Polymeric Materials
- Process Optimization of Thermoforming PP/CaCO3 Composites
- A Stiffness Criterion For Cooling Time Estimation
Articles in the same Issue
- Regular Contributed Articles
- Polymer Processing Problems from Non-Rheological Causes1
- Utilization of Rheology Control to Develop Wood-Grain Patterned PVC/Wood Flour Composites
- Screw Drive Power of Single Screw Plasticating Units With Smooth Barrels
- Design of Dispersive Mixing Devices
- Dynamic Performance of Single-Screws of Different Configurations
- A Comparative Study of Residence Time Distributions in a Kneader, Continuous Mixer, and Modular Intermeshing Co-Rotating and Counter-Rotating Twin Screw Extruders
- Influence of a ‘Rotating Tip’ on the Properties of Tubing Made Using a Cross-Head Tubing Die
- Modelling of Capillary Rheometer Data and Extrapolation of the Viscosity Function into the Linear Viscoelastic Region
- Relationship Between Structure and Spinning Processing of As-Spun PP Fibres
- Rheological and Theoretical Estimation of the Spinnability of Polyolefines
- Drawing of β-Crystal Nucleator-Added PP
- Wave Behavior in the Coating Process of Multilayer Polymeric Materials
- Process Optimization of Thermoforming PP/CaCO3 Composites
- A Stiffness Criterion For Cooling Time Estimation
