Microscale Polymer Processing

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https://www.repository.cam.ac.uk/handle/1810/196407

The micro-scale polymer processing project was a collaborative project co-ordinated by the IRC in Polymer Science and Technology at the University of Leeds. It brought together a large number of scientists and industrial collaborators in order to study how molecular variables influence polymer processing. The work carried out by the Polymer Fluids Group as part of the project included:

Investigation of flow induced crystallisation in polymer melts.
The rheological behaviour and visualisation of 2-phase polymer flows. In particular the behaviour of filled polymer systems.
Experimental investigation of the flow behaviour of polymers including flow instabilities.

The images and videos collected for this project can be viewed here.

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Now showing 1 - 20 of 25

Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 4.4mm/s, 175C
(2008-09-05T14:24:39Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 4.4 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 1.32mm/s, 175C
(2008-09-05T14:16:34Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.32 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 2.64mm/s, 175C
(2008-09-05T14:08:45Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 2.64 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 2.2mm/s, 175C
(2008-09-05T14:05:20Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 2.2 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 2.2mm/s, 155C
(2008-09-05T14:02:03Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 2.2 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 1.76mm/s, 175C
(2008-09-05T13:58:23Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.76 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 1.76mm/s, 155C
(2008-09-05T13:55:09Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.76 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 1.32mm/s, 155C
(2008-09-05T13:23:45Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.32 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.88mm/s, 175C
(2008-09-05T11:12:40Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.88 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.88mm/s, 155C
(2008-09-05T11:09:20Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.88 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.44mm/s, 175C
(2008-09-04T15:58:06Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.44 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.44mm/s, 155C
(2008-09-04T15:51:50Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.44 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.22mm/s, 175C
(2008-09-04T15:44:59Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.22 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.22mm/s, 155C
(2008-09-04T15:39:48Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.22 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.088mm/s, 175C
(2008-09-04T15:34:54Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.088 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.088mm/s, 155C
(2008-09-04T15:30:56Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.088 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.044mm/s, 175C
(2008-09-04T14:40:30Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.044 mm/s at 175C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
HDPE (CM1) optical birefringence pattern in cross-slot flow, piston speed 0.044mm/s, 155C
(2008-09-04T11:11:17Z) Hassell, David
The optical birefringence pattern obtained from lightly branched high density polyethyene (HDPE - produced by metallocene catalysis polymerisation) flowing in a cross-slot multi-pass rheometer cell. Experiment carried out on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 0.044 mm/s at 155C. The geometry generates a flow field with an extensional component at the centreline. If the no slip condition at a solid surface is satisfied, the side walls are high shear rate regions. The experiments were carried out to evaluate the material behaviour in extensional flow. At low extensional rates, an almost Newtonian stress profile is exhibited.
Open Access
Polystyrene PS648 outlet optical birefringence pattern, piston speed 1.4mm/s
(2008-08-27T16:16:25Z) Hassell, David
The optical birefringence pattern obtained from polystyrene PS648 flowing through a narrow slit. Experiment conducted on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.4 mm/s at 170C. Video shows the outlet flow (from top to bottom).
Open Access
Polystyrene PS648 inlet optical birefringence pattern, piston speed 1.4mm/s
(2008-08-27T16:11:36Z) Hassell, David
The optical birefringence pattern obtained from polystyrene PS648 flowing through a narrow slit. Experiment conducted on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.4 mm/s at 170C. Video shows the inlet flow (from bottom to top).

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