Microwave properties of poly(4,4′-diphenylene diphenylvinylene)

S. W. Phang, Rusli Daik, M. H. Abdullah

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

4,4′-dibenzoylbiphenyl monomer was successfully synthesized via the Friedel-Crafts reaction with biphenyl and benzoylchloride as starting materials. The catalyst used was anhydrous aluminium chloride. 4,4′-dibenzoylbiphenyl monomer was characterized by GCMS, elemental analysis, FTIR and 13C and 1H NMR spectroscopies. The melting point of the monomer was 218.3-219.6 °C. Purity of the monomer was high as shown by the GCMS chromatogram. Poly(4,4′-diphenylene diphenylvinylene), PDPV was synthesized via McMurry coupling reaction by using 4,4′-dibenzoylbiphenyl, titanium tetrachloride and zinc dust as the monomer, catalyst and reducing reagent, respectively, in THF. PDPV was characterized by using DSC, TGA, GPC, FTIR and UV-VIS spectroscopies. Number average molecular weight, Mn and weight average molecular weight, Mw of PDPV were 1800 gmol-1 and 2300 gmol-1, respectively, with a polydispersity index of 1.28. Conductivity of PDPV at 298 K was 5.719×10-5 S/cm as determined by using impedance spectroscopy. Reflection loss (RL), shielding effectiveness (SE), reflection power, transmission power and absorption power of PDPV within the frequency range of 0.3-13.5 GHz were calculated from complex scattering parameters that correspond to the reflection (S* 11 and S* 22) and transmission (S* 12 and S* 21) using a Hewlett Packard 8719D microwave vector network analyzer. In addition, ε′ r, ε″r, μ′r and μ″r of PDPV from 0.3 to 13.5 GHz were identified. Most of incident microwave energy was transmitted (83.3%) and only 11.7 and 5.0% were absorbed and reflected by PDPV, respectively.

Original languageEnglish
Pages (from-to)275-279
Number of pages5
JournalPolymer Testing
Volume23
Issue number3
DOIs
Publication statusPublished - May 2004

Fingerprint

Monomers
Microwaves
Molecular weight
Friedel-Crafts reaction
Aluminum chloride
Catalysts
Electric network analyzers
Scattering parameters
Polydispersity
Ultraviolet spectroscopy
Power transmission
Shielding
Nuclear magnetic resonance spectroscopy
Dust
Melting point
Zinc
Titanium
Spectroscopy
Chemical analysis

Keywords

  • Conductivity
  • Conjugated
  • Friedel-Crafts
  • McMurry
  • Microwave

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Microwave properties of poly(4,4′-diphenylene diphenylvinylene). / Phang, S. W.; Daik, Rusli; Abdullah, M. H.

In: Polymer Testing, Vol. 23, No. 3, 05.2004, p. 275-279.

Research output: Contribution to journalArticle

Phang, S. W. ; Daik, Rusli ; Abdullah, M. H. / Microwave properties of poly(4,4′-diphenylene diphenylvinylene). In: Polymer Testing. 2004 ; Vol. 23, No. 3. pp. 275-279.
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N2 - 4,4′-dibenzoylbiphenyl monomer was successfully synthesized via the Friedel-Crafts reaction with biphenyl and benzoylchloride as starting materials. The catalyst used was anhydrous aluminium chloride. 4,4′-dibenzoylbiphenyl monomer was characterized by GCMS, elemental analysis, FTIR and 13C and 1H NMR spectroscopies. The melting point of the monomer was 218.3-219.6 °C. Purity of the monomer was high as shown by the GCMS chromatogram. Poly(4,4′-diphenylene diphenylvinylene), PDPV was synthesized via McMurry coupling reaction by using 4,4′-dibenzoylbiphenyl, titanium tetrachloride and zinc dust as the monomer, catalyst and reducing reagent, respectively, in THF. PDPV was characterized by using DSC, TGA, GPC, FTIR and UV-VIS spectroscopies. Number average molecular weight, Mn and weight average molecular weight, Mw of PDPV were 1800 gmol-1 and 2300 gmol-1, respectively, with a polydispersity index of 1.28. Conductivity of PDPV at 298 K was 5.719×10-5 S/cm as determined by using impedance spectroscopy. Reflection loss (RL), shielding effectiveness (SE), reflection power, transmission power and absorption power of PDPV within the frequency range of 0.3-13.5 GHz were calculated from complex scattering parameters that correspond to the reflection (S* 11 and S* 22) and transmission (S* 12 and S* 21) using a Hewlett Packard 8719D microwave vector network analyzer. In addition, ε′ r, ε″r, μ′r and μ″r of PDPV from 0.3 to 13.5 GHz were identified. Most of incident microwave energy was transmitted (83.3%) and only 11.7 and 5.0% were absorbed and reflected by PDPV, respectively.

AB - 4,4′-dibenzoylbiphenyl monomer was successfully synthesized via the Friedel-Crafts reaction with biphenyl and benzoylchloride as starting materials. The catalyst used was anhydrous aluminium chloride. 4,4′-dibenzoylbiphenyl monomer was characterized by GCMS, elemental analysis, FTIR and 13C and 1H NMR spectroscopies. The melting point of the monomer was 218.3-219.6 °C. Purity of the monomer was high as shown by the GCMS chromatogram. Poly(4,4′-diphenylene diphenylvinylene), PDPV was synthesized via McMurry coupling reaction by using 4,4′-dibenzoylbiphenyl, titanium tetrachloride and zinc dust as the monomer, catalyst and reducing reagent, respectively, in THF. PDPV was characterized by using DSC, TGA, GPC, FTIR and UV-VIS spectroscopies. Number average molecular weight, Mn and weight average molecular weight, Mw of PDPV were 1800 gmol-1 and 2300 gmol-1, respectively, with a polydispersity index of 1.28. Conductivity of PDPV at 298 K was 5.719×10-5 S/cm as determined by using impedance spectroscopy. Reflection loss (RL), shielding effectiveness (SE), reflection power, transmission power and absorption power of PDPV within the frequency range of 0.3-13.5 GHz were calculated from complex scattering parameters that correspond to the reflection (S* 11 and S* 22) and transmission (S* 12 and S* 21) using a Hewlett Packard 8719D microwave vector network analyzer. In addition, ε′ r, ε″r, μ′r and μ″r of PDPV from 0.3 to 13.5 GHz were identified. Most of incident microwave energy was transmitted (83.3%) and only 11.7 and 5.0% were absorbed and reflected by PDPV, respectively.

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