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The Mystery of Physical Aging: Part 2
Dimensional and property changes depend on the size of the part, molecular weight of the resin, and processing conditions.
Columns Published: 11/24/2014
MATERIALS: The Mystery of Physical Aging: Part 1
In polymers, aging is commonly considered essentially synonymous with oxidation. But there are important differences between this type of chemical aging and less commonly recognized physical aging. Let’s unlock the mystery.
Columns Published: 10/23/2014
MATERIALS: Don’t Guess Your Way through Root Cause Analysis: Part 2
The huge chasm between the laboratory and manufacturing discipline usually does not lend itself to problem-solving. It can be improved with clear communication between the analysis laboratory and the people bringing the problem to the lab.
Columns Published: 9/22/2014
MATERIALS: Don’t Guess Your Way Through Root Cause Analysis
More than 50 different polymer test techniques can be used to find root causes of problems. Of these, five or six are fairly common. Use them to take the guesswork out of why a product failed.
Columns Published: 8/25/2014
MATERIALS: Performance in Polyethylene: Density Matters: Part II
Remembering the case of the failed gas tanks.
Columns Published: 7/28/2014
MATERIALS: Performance in Polyethylene: Density Matters
In polyethylene, density provides another mechanism to control properties. But it must be specified properly.
Columns Published: 6/19/2014
MATERIALS: Melt Flow Rate Testing—Part 10
Two areas where the melt flow rate test it is not useful are related to processing.
Columns Published: 4/23/2014
Melt Flow Rate Testing—Part 9
Understanding the value of melt-volume rate.
Columns Published: 3/21/2014
Melt Flow Rate Testing—Part 7
Here is why the melt flow test is not universal.
Columns Published: 1/23/2014
Melt Flow Rate Testing—Part 6
Once degradation has been established, the discussion inevitably turns to how it happened. It might be expected that the answer to this question is widely known. Not so. The good news is that the influences that cause polymer degradation during proc...
Columns Published: 12/29/2013

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