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Michael Sepe Independent Consultant
Tracing the History of Polymeric Materials: Celluloid & Film Stock
In this series we delve into a discerning look back into the history of our industry and how we all got here.
Read MoreTracing the History of Polymeric Materials--There's More on Celluloid
The invention of Celluloid got the ball rolling for future innovations in materials and processing.
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Tracing the History of Polymeric Materials: Celluloid
In this series we’ll delve into a discerning look back into the history of our industry and how we all got here.
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Materials: Annealing Tips for Polyamide-imide, Part 7 of 7
PAI is a material capable of achieving levels of performance that even semi-crystalline engineering polymers like PEEK, PPS, and PPA cannot. But you have to be willing to work for that performance, and the annealing process is an essential part of this.
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Materials Part 5: Annealing Tips for Crosslinked Polymers
As with semi-crystalline thermoplastics, annealing can be used in thermosetting polymers to obtain a level of crosslinking that may not be possible within the molding cycle.
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Materials: Annealing Tips for Semi-Crystalline Polymers: Part 4
You can forgo the elevated mold temperatures normally recommended for high-performance semi-crystalline materials. But it’s risky and likely to yield parts that under-perform expectations … assuming that they emerge from the annealing process looking anything like the drawing.
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Part 3 Materials: Annealing Tips for Semicrystalline Polymers
For these polymers, annealing is done to establish a level of crystallinity that cannot be practically obtained within the parameters of a normal molding cycle. Here’s some guidance on setting annealing time and temperature.
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Materials: Annealing Tips for Amorphous Polymers, Part 2
In amorphous polymers, annealing is performed to draw down the internal stresses to a level not achievable within the conditions of a normal molding process. But a few parameters are important to achieving the desired results.
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Materials Part 1: What Annealing Can Do for Your Process
Relatively rapid cooling rates in processing introduce internal stress. If functional problems in use result, annealing may draw down the stress to levels that may not be achievable during processing.
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Fundamentals of Polyethylene – Part 6: PE Performance
Don’t assume you know everything there is to know about PE because it’s been around so long. Here is yet another example of how the performance of PE is influenced by molecular weight and density.
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Fundamentals of Polyethylene – Part 5: Metallocenes
How the development of new catalysts—notably metallocenes—paved the way for the development of material grades never before possible.
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Polyethylene Fundamentals – Part 4: Failed HDPE Case Study
Injection molders of small fuel tanks learned the hard way that a very small difference in density — 0.6% — could make a large difference in PE stress-crack resistance.
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