Block-Copolymers of Polyacrylamide with Poly(Ethylene Oxide) Forming Intramolecular Polycomplexes

Abstract

Diblock-copolymers of polyacrylamide (PAA) and monomethyl ethers of poly(ethylene glycol) (MEPEG) of different molecular weights (M _vMEPEG = 7.5 ⋅ 10² − 5 ⋅ 10³) are obtained. The positive matrix effect depending on the length of MEPEG chains is revealed. The copolymerization kinetics is measured by dilatometry and compared with that of AA homopolymerization.

Molecular parameters of synthesized copolymers are determined by size exclusion chromatography (SEC). Structural investigations are carried out by differential scanning calorimetry (DSC).

Keywords:

• acrylamide
• diblock-copolymers
• intramolecular polycomplex
• matrix effect
• monomethyl ether of poly(ethylene glycol)

Notes

^a The rate of homopolymerization and block-copolymerization of the monomer at 10, 20, and 30% conversion.

^b Inductive period.

^c Conversion of the monomer in 24 h.

^a The heat capacity jump. ^b The range of crystallinity Xc = ΔHm/ΔH°m, where ΔH°m–enthalpy of melting for 100% crystalline polymer (196.8 J/g).