Flow-induced crystallization of high-density polyethylene: the effects of shear and uniaxial extension

2011 ◽  
Vol 51 (4) ◽  
pp. 315-327 ◽  
Author(s):  
Maziar Derakhshandeh ◽  
Savvas G. Hatzikiriakos
Keyword(s):  
High Density Polyethylene ◽  
Uniaxial Extension ◽  
High Density ◽  
Induced Crystallization ◽  
Flow Induced Crystallization

scholarly journals Development of Inorganic Particle-Filled Polypropylene/High Density Polyethylene Membranes via Multilayer Co-Extrusion and Stretching

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 306
Author(s):  
Pilar Castejón ◽  
Marcelo Antunes ◽  
David Arencón
Keyword(s):  
Calcium Carbonate ◽  
High Density Polyethylene ◽  
High Density ◽  
Porous Membranes ◽  
Inorganic Particle ◽  
Porous Surfaces ◽  
Mineral Fillers ◽  
Induced Crystallization ◽  
Thermal Stability Of ◽  
Flow Induced Crystallization

This work is made to ascertain the effects of mineral fillers, namely calcium carbonate and talc, on the morphology and properties of multilayer polypropylene (PP)/high-density polyethylene (HDPE) porous membranes. Multilayer membranes were prepared using the three-stage Melt-Extrusion, Annealing and Uniaxial Stretching (MEAUS) process. The orientation of PP’s crystalline phase was affected by both the flow-induced crystallization and the heterogeneous nucleation promoted by the fillers. A synergistic effect was observed in the filled samples due to the generation of pores after the stretching-induced lamellae separation and the debonding of mineral fillers from the polymeric matrix. The fillers increased the porous surface, leading to an increase of permeance to air, being this effect more marked at higher filler contents. Talc showed a higher efficiency to create porous surfaces when compared to calcium carbonate. The thermal stability of the membranes increased with filler addition, as well as their stiffness and strength.

scholarly journals Influence of shear-induced crystallization on the electrical conductivity of high density polyethylene carbon nanotube nanocomposites

Polymer ◽  
2012 ◽  
Vol 53 (25) ◽  
pp. 5909-5916 ◽  
Author(s):  
Fangfang Tao ◽  
Leïla Bonnaud ◽  
Dietmar Auhl ◽  
Bernd Struth ◽  
Philippe Dubois ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
High Density Polyethylene ◽  
High Density ◽  
Induced Crystallization

Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene

Polymer ◽  
2009 ◽  
Vol 50 (2) ◽  
pp. 636-644 ◽  
Author(s):  
Yan Wang ◽  
Kun Meng ◽  
Song Hong ◽  
Xuming Xie ◽  
Chenggui Zhang ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
High Density Polyethylene ◽  
High Density ◽  
Induced Crystallization

Flow-Induced Crystallization of High-Density Polyethylene

1995 ◽  
Vol 60 (10) ◽  
pp. 1733-1740 ◽  
Author(s):  
Ivan Fortelný ◽  
Jana Kovářová ◽  
Josef Kovář
Keyword(s):  
High Density Polyethylene ◽  
Molar Mass ◽  
Maximum Temperature ◽  
Capillary Viscometer ◽  
Linear Polyethylene ◽  
Shear Rates ◽  
Melting Temperatures ◽  
Dsc Measurements ◽  
Induced Crystallization ◽  
Flow Induced Crystallization

Crystallization induced by flow in the capillary viscometer was studied for four grades of linear polyethylene. From rheological and DSC measurements it follows that crystallization was induced in all samples under study at temperatures higher than melting temperatures of the same samples crystallized at rest. The maximum temperature of flow-induced crystallization increases with increasing molar mass of polyethylene. Flow-induced crystallization of injection moulding grades of polyethylene only takes place in a limited interval of shear rates. This effect is explained as a consequence of the shear rate distribution in the capillary.

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