Synthesis of poly(p‐phenylene) macromonomers and multiblock copolymers

Abstract

Rigid‐rod poly(4′‐methyl‐2,5‐benzophenone) macromonomers were synthesized by Ni(0) catalytic coupling of 2,5‐dichloro‐4′‐methylbenzophenone and end‐capping agent 4‐chloro‐4′‐fluorobenzophenone. The macromonomers produced were labile to nucleophilic aromatic substitution. The molecular weight of poly(4′‐methyl‐2,5‐benzophenone) was controlled by varying the amount of the end‐capping agent in the reaction mixture. Glass‐transition temperatures of the macromonomers increased with increasing molecular weight and ranged from 117 to 213 °C. Substitution of the macromonomer end groups was determined to be nearly quantitative by 1H NMR and gel permeation chromatography. The polymerization of a poly(4′‐methyl‐2,5‐benzophenone) macromonomer [number‐average molecular weight (Mn) = 1.90 × 103 g/mol; polydispersity (Mw)/Mn = 2.04] with hydroxy end‐capped bisphenol A polyaryletherketone (Mn = 4.50 × 103 g/mol; Mw/Mn = 1.92) afforded an alternating multiblock copolymer (Mn = 1.95 × 104 g/mol; Mw/Mn = 6.02) that formed flexible, transparent films that could be creased without cracking. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3505–3512, 2001

A Novel Polyamide 12/Al-Cu-Fe Quasicrystal Composite

“…t J is the creep compliance of modified Burgers model, 1 J is the creep compliance of element 1 (spring 1), 2 J is the creep compliance of Kelvin-Voigt model with a spring (spring 2) and a dashpot in parallel, 1 E is the modulus of spring 1, 2 E is the modulus of spring 2, 2 η is the viscosity of the dashpot, t is the time of applying stress. The retardation time is τ, which is the time required for the Kelvin-Voigt model to deform to 63.21% of its total deformation.…”

“…Polymer/quasicrystal composites represent one promising application of quasicrystals. Polyphenylene sulfide (PPS), poly (aryletherketone) (PAEK) and poly (etherketoneketone) (PEKK) have been investigated as matrices of polymer/Al-Cu-Fe quasicrystal composites [1][2][3][4]. It was discovered that quasicrystal Al-Cu-Fe particles enhanced the wear resistance of the polymers significantly.…”

Phenylene dendrimers and novel hyperbranched polyphenylenes as light emissive materials for blue OLEDs

“…Wide band gaps allowing emission of blue light (400-450 nm) are typical for polyphenylenes. Linear polyphenylenes (PPP) [2][3][4][5], including polyfluorenes [6] have been studied widely as luminescent materials. The insolubility of PPP necessitates the incorporation of the substituents.…”

Successive Chain‐Growth Condensation Polymerization for the Synthesis of Well‐Defined Diblock Copolymers of Aromatic Polyamide and Aromatic Polyether

“…There are several reports on the synthesis of block copolymers composed exclusively of rigid or semi‐rigid condensation oligomers or polymers,5–12 and these block copolymers appear to have unique and intriguing characteristics because of strong intermolecular interactions. For example, Jenekhe and co‐workers synthesized poly(2,5‐benzoxazole)‐ block ‐poly(benzobisthiazole‐2,6‐diyl‐1,4‐phenylene)‐ block ‐poly(2,5‐benzoxazole) as an ABA triblock conjugated copolymer.…”