Key relationships between molecular structure and final properties are reported for standard flow high grades of commercially-available polyetheretherketone (PEEK) resins that differ primarily in weight distribution. Despite similar chemistry composition, the size-dependent structural differences associated with PEEK this study shown to influence crystallization rate, crystallinity, melt rheology during processing, which subsequently affects mechanical properties, including strength,...

Additive manufacturing is poised to enable the next biomedical revolution, where customized, patient-specific tools, therapies, pharmaceuticals, and even replacement organs are taking strides in research development space. Polymeric materials capable of making inroads a wide variety applications, recent years growing number being used with additive techniques. This review highlights some emerging classes polymers examples their use focus on delineation 'hard' versus 'soft' specific...

Abstract This study describes a detailed analytical characterization of polyaryletherketone (PAEK) polymers used in extrusion‐based additive manufacturing. The results provide key observations and highlight differences between commercially available the PAEK family, specifically polyetheretherketone (PEEK) polyetherketoneketone (PEKK). Results suggest that inherent their molecular structure lead to notable terms viscoelastic, thermal physical properties. Similarly, direct comparison...

Abstract CO 2 ‐assisted polymer processing is proposed as an alternative route for intractable and high molecular weight polymers based on the plasticization effects of its direct effect melting behavior semicrystalline polymers. A modified system was used to process a variety in presence high‐pressure . The includes extruder that allow pressures created by injection new design feed section allows given mass interact with before during extrusion process. inherent shear mixing specific...

This article reports the synthesis and characterization of four arm star‐shaped poly(styrene‐ b ‐[(butadiene) 1−x ‐(ethylene‐ co ‐butylene) x ]‐ ‐styrene) (SBEBS) copolymers. A series SBEBS copolymers with different compositions elastomeric block were produced by hydrogenating a given ‐butadiene‐ (SBS) copolymer using catalyst prepared from bis( η 5 ‐cyclopentadienyl)titanium(IV) dichloride n ‐butyllithium. The was accomplished proton nuclear magnetic resonance spectroscopy ( 1 H NMR),...

Abstract The drawing behavior of ultrahigh molecular weight polyethylene fibers in supercritical carbon dioxide (scCO 2 ) is compared to that air at different temperatures. temperature substantially influences the properties air, whereas scCO , a constant draw stress and tensile strength are observed. Differential scanning calorimetry shows an apparent development hexagonal phase along with significant increase crystallinity air‐drawn samples increasing temperature. existence this not...

Journal Article High Performance Polymers in Additive Manufacturing Processes: Understanding Process, Structure and Property Get access Manuel Garcia-Leiner, Garcia-Leiner Exponent, Inc. Polymer Science Materials Chemistry, Bowie, MD, USA Search for other works by this author on: Oxford Academic Google Scholar Daniel P Dennies, Dennies Corrosion Engineering, Irvine, CA, Atif Yardimci Biomedical Chicago, IL, Microscopy Microanalysis, Volume 21, Issue S3, 1 August 2015, Pages 127–128,...