Synthesis and characterization of novel poly(alpha-methyl beta-alanine-b-lactone)s through hydrogen-transfer and ring-opening polymerization

ÇATIKER E., KIRLAK S., ATAKAY M., SALİH B.

OVIDIUS UNIVERSITY ANNALS OF CHEMISTRY, cilt.33, sa.1, ss.78-83, 2022 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Sayı: 1
  • Basım Tarihi: 2022
  • Doi Numarası: 10.2478/auoc-2022-0011
  • Dergi Adı: OVIDIUS UNIVERSITY ANNALS OF CHEMISTRY
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI)
  • Sayfa Sayıları: ss.78-83
  • Anahtar Kelimeler: AB-type block copolymers, poly(amide-ester), hydrogen-transfer polymerization, ring-opening polymerization, POLY-BETA-ALANINE, BLOCK-COPOLYMER, ACRYLAMIDE, OXIDE)
  • Hacettepe Üniversitesi Adresli: Evet

Özet

A series of novel poly(alpha-methyl beta-alanine-b-lactone)s were prepared by a combination of hydrogen-transfer polymerization (HTP) of methacrylamide (MAm) and anionic ring-opening polymerization (AROP) of beta-propiolactone (BPL), beta-butyrolactone (BBL), and delta-valerolactone (DVL). For this purpose, poly(alpha-methyl beta-alanine) (PmBA) having a living anionic end-group for a further extension was obtained via HTP of MAm. The anionic end-group on PmBA chains were used as initiation sites for AROP of BPL, BBL, and DVL. Fourier Transform Infrared Spectroscopy (FTIR) and Proton Nuclear Magnetic Resonance Spectroscopy (H-1-NMR) confirmed the existence of both ester and alpha-methyl beta-alanine (mBA) units in the final products. MALDI-MS analysis revealed that the poly(alpha-methyl beta-alanine-b-lactone)s with average molar masses of several thousand g.mol(-1) were obtained. DSC and TGA thermograms of each copolymer showed that the copolymers comprised the mBA and the corresponding ester units.