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The depression of both characteristic temperatures is believed to be induced simply by the disruption of crystalline morphology (size, perfection, quantity) with increased branching. Note that at 1 mol% branching agent, no discernible crystallization was observable by DSC methods. This observation is supported by experience in the molding of branched PPS products, in which molded articles can be prepared (intentionally or accidentally) which exhibit effectively no thermoplastic behavior and show very poor physical property balance.

Monomer to polymer in reaction system 2. Polymer post-reaction processing (devol, drying, melt filtering, pelletizing) 3. Reinforcement / fillers / additives. 4. Melt forming working shape. Figure 5 Sequence of steps from conversion of monomer to polymer all the way to end use article fabrication. Each of these steps contributes to the final property balance of the part in the finished article to varying degrees. In semi-crystalline materials such as the PAEK’s we are referring to here, this is especially true since the mechanical properties are strongly impacted by the crystallinity established in the material, both from a bulk crystallinity level and the size and distribution of crystallites within the polymer matrix.

Additionally, performance requirement definition from the end user application space passed down the supply chain to the academicians and researchers will provide tangible goals for the applied research into this family of important engineering polymers. From a materials science perspective, it is therefore important to understand the principle contributing features of the polymer structures themselves, as well as how such features may be impacted through the process of polymerizing monomers all the way to placing a finished part into a service application.

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