Radiation induced solid-state polymerization of acetylenedicarboxylic acid

Usanmaz A., Alturk E.

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, cilt.39, sa.5, ss.379-395, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 5
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1081/ma-120003958
  • Dergi Adı: JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.379-395
  • Anahtar Kelimeler: solid-state polymerization, acetylene, disubstituted acetylene, direct pyrolysis, radiation polymerization, CONJUGATED TRIPLE-BONDS, ORGANOMETALLIC COCATALYSTS, TOPOCHEMICAL REACTIONS, MONOMERS, TACL5
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

Radiation induced solid-state polymerization of acetylenedicarboxylic acid was carried out at room temperature in open atmosphere and under vacuum conditions. The gray colored powder polymer obtained was insoluble in most common solvents but only partially soluble in DMSO and THF. The limiting conversion to polymer was about 5%. The polymer was characterized by IR, UV, DP-MS, DSC, TGA, and XRD. The mechanism of polymerization was elucidated from the available data. Polymerization followed a free radical mechanism. However, before the addition of monomer molecules to the growing chain, at least one of the carboxylic groups of the monomer breaks away as CO or CO2. The formation of side group cyclization takes place. At least one of the bonds in the side cyclic group is an etheric bond. The DSC, TGA, and XRD results showed that the polymer was partially crystalline and showed no melting up to 1200degreesC. The mechanism of polymerization and assigned chain structure was studied by the direct pyrolysis mass spectrometric method.