Conformational changes and swelling behavior of poly[(methacrylic acid)-co-(methyl methacrylate)] gel in solution of linear poly(ethylene glycol)

Interchain Hydrogen-Bonding-Induced Association of Poly(acrylic acid)-graft-poly(ethylene oxide) in Water

“…Khutoryanskiy et al studied the pH effect on the complex formation between PAA and PEO by fluorescent methods; their results showed that insoluble interpolymer complexes come up below a certain critical pH values of complexation (pH crit,1 ); and the formation of hydrophilic interpolymer associates is possible above pH crit,1 and below a certain pH crit,2 . Studies were also taken on the conformation changes of PAA or PMAA gels in the PEO solutions, ,, and the results showed that the contraction of the gel took place as a result of the formation of an intermolecular polymer complex on the basis of hydrogen bonding, which was influenced by the concentration and molecular weight of PEO. Compared to the studies on PAA/PEO mixtures, only a few were concerned with the complexation of PAA−PEO copolymers. , These copolymers could be PAA- b -PEO and PAA- g -PEO prepared by the copolymerization of AA and methacryloyl-capped PEO.…”

Investigation of Complexation of Linear Poly(N‐vinyl‐2‐pyrrolidone) with Poly(methacrylic acid‐co‐methyl methacrylate) Gel

“…DSC and DMA results discussed later suggested that no excess PVP is observed and there is only the PVP: PMAA complex phase even in the solution of C P = 40 wt %. 18 . There are some possible reasons for this effect: (1) a first complexation of a carbonyl group of PVP with an acid group of PMAA may induce the formation of a second hydrogen bond between vicinal -COOH groups, or each carbonyl can be complexed with the two -COOH groups simultaneously 15 ; (2) the molecular weight of PVP are higher compared with PEG, thus the steric hindrance would hinder the PMAA from forming complex with PVP; (3) the MMA units in the polymer network are uncomplexable and behave as structure defects.…”