Unusual thermal relaxation of viscosity-and-shear-induced strain in poly(ether-ketones) synthesized in highly viscous polyphosphoric acid/P2O5 medium

Baek, Jong‐Beom; Park, Soo‐Young; Price, Gary E.; Lyons, Christopher B.; Tan, Loon‐Seng

doi:10.1016/j.polymer.2004.12.022

Cited by 36 publications

(39 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also demonstrated the functionalization of electron deficient vapor-grown carbon nanofiber (VGCNF) [25] and grafting of meta-polyetherketone or mPEK onto VGCNF by an in situ Friedel-Crafts polymerization of an AB monomer, 3-phenoxybenzoic acid, in the same medium [26]. Because of viscous character of PPA medium, prepared polymers displayed unusual thermal relaxation of viscosity-and-shearinduced strain [27]. We expect that PPA is a mild and lessdestructive reaction medium and plays two important roles for the effective and thus uniform covalent attachment on the surface of carbon nanomaterials.…”

Section: Introductionmentioning

confidence: 97%

Multiwalled carbon nanotubes and nanofibers grafted with polyetherketones in mild and viscous polymeric acid

Lee

Keum

et al. 2006

Polymer

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 97%

Multiwalled carbon nanotubes and nanofibers grafted with polyetherketones in mild and viscous polymeric acid

Lee

Keum

et al. 2006

Polymer

Self Cite

View full text Add to dashboard Cite

“…Poly(aryl ether ketone)s (PAEKs), including poly(ether ether ketone) (PEEK), poly(ether ketone ketone) (PEKK), and poly(ether ether ketone ketone) are a family of high‐performance engineering thermoplastics, known for their excellent thermal, mechanical, and electrical properties . This class of advanced materials is currently receiving much attention for potential applications in aerospace, automobile, electronics, and other high technology fields . Poly(aryl ether ketone)s (PAEKs) can be prepared via two approaches, the nucleophilic and the electrophilic aromatic substitution polycondensation .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of poly(aryl ether ketone)s containing both biphenylene moieties and sulfone linkages in the main chain

et al. 2015

View full text Add to dashboard Cite

Two monomers, 4,4 0 -bis(4-phenoxybenzoyl)biphenyl (BPOBBP) and 4,4 0 -diphenoxydiphenyl sulfone (DPODPS), were conveniently synthesized via simple synthetic procedures from readily available materials. A series of novel poly(aryl ether ketone)s containing both biphenylene moieties and sulfone linkages in the main chain were synthesized by the modified electrophilic Friedel-Crafts acylation copolycondensation of isophthaloyl chloride (IPC) with a mixture of BPOBBP and DPODPS, over a wide range of BPOBBP/DPODPS molar ratios. The resulting polymers were characterized by Fourier transform infrared spectroscopy (FT-IR), wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA), etc. The results indicated that the copolymers with 30 to 35 mol% DPODPS were semicrystalline and had remarkably increased glass transition temperatures (T g s) over the conventional poly(ether ether ketone) (PEEK) and poly(ether ketone ketone) (PEKK) due to the incorporation of biphenylene units and sulfone linkages in the main chain. The copolymers with 30 to 35 mol% DPODPS had not only high T g s of 176 to 177 C, but also moderate melting temperatures (T m s) of 334 to 337 C, having good potential for the melt processing. The semicrystalline copolymers II to V had tensile strengths of 99.8 to 103.1 MPa, Young's moduli of 2.26 to 2.79 GPa, and elongations at break of 16.8 to 26.5% and exhibited outstanding thermal stability and good resistance to organic solvents. POLYM. ENG. SCI., 55:2140-2147, 2015

show abstract

“…Choi et al [69] reported a self-controlled synthesis of hb-PAEKs from diphenyl ether (or 1,4-diphenoxybenene, B 2 ) and trimesic acid (A 3 ) via the Friedel-Crafts reaction. Baek and coworkers developed optimized conditions for Friedel-Crafts acylation in poly(phosphoric acid)/phosphorus pentoxide (PPA/P 2 O 5 ) medium for the preparation of hb-PAEKs [70,71]. Martinez and Hay [72,73] proposed the efficient synthesis and characterization of hb poly(aryl ether sulfone)s with a K 2 CO 3 /Mg(OH) 2 catalyst system for nucleophilic aromatic substitution.…”

Section: Synthesis Of Aromatic Hyperbranched Polymersmentioning

confidence: 99%

Aromatic Hyperbranched Polymers: Synthesis and Application

Ghosh

Banerjee

Voit

2014

Porous Carbons – Hyperbranched Polymers – Polymer Solvation

View full text Add to dashboard Cite

Hyperbranched (hb) polymers have been receiving increasing attention because of their unique architecture that results in an interesting set of unusual chemical and physical properties. Over the past decade quite a number of excellent reviews on hb polymers have been published by different research groups, covering various aspects of this class of polymers. This review will highlight the work on aromatic hb polymers of the last decade, emphasizing general synthetic strategies and recent development of alternative synthetic strategies, and discussing various aspects of hb polymers to demonstrate their wide range of applications.

show abstract

Unusual thermal relaxation of viscosity-and-shear-induced strain in poly(ether-ketones) synthesized in highly viscous polyphosphoric acid/P2O5 medium

Cited by 36 publications

References 14 publications

Multiwalled carbon nanotubes and nanofibers grafted with polyetherketones in mild and viscous polymeric acid

Multiwalled carbon nanotubes and nanofibers grafted with polyetherketones in mild and viscous polymeric acid

Synthesis and properties of poly(aryl ether ketone)s containing both biphenylene moieties and sulfone linkages in the main chain

Aromatic Hyperbranched Polymers: Synthesis and Application

Contact Info

Product

Resources

About