Synthesis and characterization of novel ABA type poly(Ester-ether) triblock copolymers


Catiker E., Ozturk T., ATAKAY M., SALİH B.

JOURNAL OF POLYMER RESEARCH, vol.26, no.5, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 5
  • Publication Date: 2019
  • Doi Number: 10.1007/s10965-019-1778-5
  • Journal Name: JOURNAL OF POLYMER RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Hydrogen transfer polymerization, ABA type triblock copolymer, Macromonomer, Poly(3-hydroxypropionate), Poly(ethylene glycol), End-group modification, Water uptake measurement, FRAGMENTATION CHAIN TRANSFER, RING-OPENING POLYMERIZATION, ONE-STEP SYNTHESIS, TRIARM BLOCK-COPOLYMERS, GRAFT-COPOLYMERS, CLICK CHEMISTRY, POLY(ETHYLENE GLYCOL), CYLINDRICAL BRUSHES, ACRYLIC-ACID, POLYESTERS
  • Hacettepe University Affiliated: Yes

Abstract

Oligomers of poly(3-hydroxypropionate) (P3HP) were synthesized via hydrogen transfer polymerization of acrylic acid. Olefinic end-group of the oligomers were modified through epoxidation and bromination to obtain activated oligomers with epoxy and bromide end-groups, respectively. Terminally hydroxyl oligomeric poly(ethylene glycol) (PEG-1450) was also converted to sodium alkoxide of PEG-1450 through reaction with sodium hydride. Novel ABA type P3HP-b-PEG-b-P3HP triblock copolymers were successfully obtained through simple nucleophilic addition reactions between alkoxy and epoxy/alkyl bromide. Water uptake measurements of the triblock copolymers were calculated. Characterization of the modified oligomers and the triblock copolymers was performed by using FT-IR, H-1-NMR and MALDI-MS analyses. Thermal transitions and degradation features of the copolymers were investigated by using DSC and TGA methods. Spectroscopic and thermal analyses revealed that both end-group modifications and coupling reactions were successfully achieved.