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Additional info for High Performance Plastics 2011
In practice, it is common in our company to avoid the use of re-processed branched PPS materials due to the significant changes in melt viscosity during thermal processing, to the point where the material becomes so hard and incompressible that it will scour barrels and screws. Paper 4 Page 4 of 10 pages High Performance Plastics 2011 23-24 February, 2011 – Cologne, Germany Why do we care about these features of linear vs branched PPS resins? Each of the examples shown above directly reflects a change or difference in crystalline morphology, molecular weight, and thermal stability of the melt.
Smaller parts will have smaller surface and heat managing becomes an issue for those parts. Automotive parts will need higher durable temperature use due to improved noise reduction under the hood and higher engine efficiency. Parts in electronics need lead free soldering and common used materials will come to limitations. Which HT Polymer is the right one to design these parts for the future? This question will be answered with the detail look into the balance of properties. With VESTAMID HT plus ( PPA ) and VESTAKEEP (PEEK) from Evonik Degussa GmbH we like to show which of these HT Polymers is better for which specific job.
Very simply, not all PEEK’s are created equal, and in material selection for specific end use, we need to be cognizant of the specific features that are required to solve our problem. In the case shown, if we were for example concerned with higher impact strengths, we might choose the Evonik material. If we desired properties associated with higher tensile modulus, we might evaluate the Gharda product. 2 Tensile Strength @ Break (Mpa) 0 Flexural Strength (Mpa) Elongation at Break (%) Flexural Modulus (Gpa) Tensile Modulus (Gpa) Figure 6 Some typical physical and thermal property characteristics for four commercial PEEK resins, expressed for ease of comparison as percent deviation from the properties of Victrex 450G resin normalized to a value of 1.