Effect of Gel and Nonrubber Constituents on the Extrusion Properties of Guayule Rubber

1983 ◽  
Vol 56 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Sergio A. Montes ◽  
M. A. Ponce-Vélez
Keyword(s):  
Experimental Study ◽  
Shear Rates ◽  
Paraffinic Oil ◽  
Induced Crystallization ◽  
Flow Induced Crystallization ◽  
Low Shear

Abstract An experimental study on the effect of gel and nonrubber constituents on the extrusion behavior of guayule rubber (GR) has been carried out. At 140°C, gel increases the viscosity at low shear rates. When GR is properly stabilized, no peptizing effect is imparted by the resin. However, the resin acts as a moderate plasticizer as compared to paraffinic oil. At 120°C, the effect of gel is noticeable at high extrusion rates, increasing the viscosity, suggesting an increase in the tendency for the occurrence of flow-induced crystallization.

Shear induced crystallization and melting of a micellar solution

1993 ◽  
Vol 442 (1914) ◽  
pp. 221-230 ◽  
Keyword(s):  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
Selective Solvent ◽  
Shear Rates ◽  
High Shear Rates ◽  
Couette Cell ◽  
Spherical Micelles ◽  
Induced Crystallization ◽  
Low Shear

Di-block copolymers of polystyrene- b -ethylene-co-propylene in the selective solvent dodecane form highly monodisperse spherical micelles. At concentrations above about 3 wt % these form microdomains with crystalline order, and the type of lattice appears to depend on the shear treatment of the sample. Formation of long range order is enabled by very low shear rates and gives rise in small angle neutron scattering experiments to a pattern of diffraction spots. The formation of the long range order and the melting at high shear rates has been followed in a sequence of SANS experiments carried out on samples contained in a Couette cell.

scholarly journals Flow-Induced Crystallization of PB-1:  From the Low Shear Rate Region up to Processing Rates

2006 ◽  
Vol 39 (26) ◽  
pp. 9215-9222 ◽  
Author(s):  
Jimmy Baert ◽  
Peter Van Puyvelde ◽  
Florentin Langouche
Keyword(s):  
Shear Rate ◽  
Rate Region ◽  
Induced Crystallization ◽  
Flow Induced Crystallization ◽  
Low Shear

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.

Modeling flow-induced crystallization in isotactic polypropylene at high shear rates

2015 ◽  
Vol 59 (3) ◽  
pp. 613-642 ◽  
Author(s):  
Peter C. Roozemond ◽  
Martin van Drongelen ◽  
Zhe Ma ◽  
Martien A. Hulsen ◽  
Gerrit W. M. Peters
Keyword(s):  
Isotactic Polypropylene ◽  
High Shear ◽  
Shear Rates ◽  
High Shear Rates ◽  
Induced Crystallization ◽  
Modeling Flow ◽  
Flow Induced Crystallization

scholarly journals A novel approach to the study of extensional flow-induced crystallization

2021 ◽  
Vol 96 ◽  
pp. 107060
Author(s):  
Juliana Amirdine ◽  
Thouaïba Htira ◽  
Nicolas Lefevre ◽  
René Fulchiron ◽  
Nathalie Mathieu ◽  
...  
Keyword(s):  
Extensional Flow ◽  
Novel Approach ◽  
Induced Crystallization ◽  
Flow Induced Crystallization
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