Surface analysis of poly(ether imide) by inverse gas chromatography

ÇAKAR F., YAZICI Ö., Sakar D., CANKURTARAN Ö., KARAMAN F.

OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS, cilt.5, sa.8, ss.821-826, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 5 Sayı: 8
  • Basım Tarihi: 2011
  • Dergi Adı: OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.821-826
  • Anahtar Kelimeler: Inverse gas chromatography, Ultem, Surface free energies, Lewis acid-base constants, ADSORPTION, MOLECULES
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

In this work, the surface properties of poly(ether imide) (Ultem) were analyzed by inverse gas chromatography. Four n-alkanes (n-C7, n-C8, n-C9 and n-C10) were chosen as nonpolar probes to characterize the surface dispersive free energy at different temperatures. The retentions of tetrahydrofurane, dichloromethane, chloroform, ethyl acetate and diethyl ether on Ultem were measured in the temperature range from 303.2 K to 328.2 K by inverse gas chromatography. The dispersive component of the surface free energy, gamma(D)(S) of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. Thermodynamic parameters of adsorption (free energy, Delta G(A)(S), enthalpy, Delta H-A(S) and entrophy, Delta S-A(S)), dispersive components of the acid, K-A and base, K-D constants for the Ultem were calculated. The results mean that Ultem was a strong basic polymer.