GRAFTING ON POLYBUTADIENE WITH MACRO OR MACROMONOMER INITIATORS CONTAINING POLY(ETHYLENE GLYCOL) UNITS

HAZER B.

MACROMOLECULAR CHEMISTRY AND PHYSICS, cilt.196, sa.6, ss.1945-1952, 1995 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 196 Sayı: 6
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1002/macp.1995.021960614
  • Dergi Adı: MACROMOLECULAR CHEMISTRY AND PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1945-1952
  • Karadeniz Teknik Üniversitesi Adresli: Hayır

Özet

Crosslinked poly(ethylene glycol)-block-polybutadiene block copolymers were obtained by coupling reaction of polybutadiene (PBd) with macromonomer azo initiators (macroinimers) or polyazoesters (PAE) in moderate yield (22-75%). NMR and FT-IR spectroscopy measurements were used to characterize and determine the poly(ethylene glycol) (PEG) contents (20-66%). The latter depends on the initial concentration of the azo compounds. Broad melting peaks appear in the DSC curves in a temperature range from about 65-130 degrees C. The crosslinked polymers containing PEG-1500 units showed sharp melting transitions and the second heating cycle showed that recrystallization rates are very high. Swelling ratios of the polymer networks were determined in water (1,22-2,96) and in CHCl3 (7,81 -20,84). The morphology of the cold fractured area of the crosslinked polymers was analyzed by scanning electron microscopy (SEM).