Jump to main content
Jump to site search

Issue 12, 2018
Previous Article Next Article

The role of unique spatial structure in the volume phase transition behavior of poly(N-isopropylacrylamide)-based interpenetrating polymer network microgels including a thermosensitive poly(ionic liquid)

Author affiliations

Abstract

Well-defined poly(N-isopropylacrylamide)/poly(tributylhexylphosphonium 3-sulfopropylmethacrylate) (PNIPAM/P[P4,4,4,6][MC3S]) interpenetrating polymer network (IPN) microgels were synthesized by two-step precipitation polymerization, and the thermally induced phase transition mechanism of IPN microgels was investigated using dynamic light scattering (DLS), temperature-dependent IR spectroscopy together with the perturbation correlation moving window (PCMW) technique and two dimensional correlation spectroscopy (2Dcos). For comparison, PNIPAM/P[P4,4,4,6][MC3S] polymer mixture was also studied to reveal the influence of the complex spatial network of IPN on the thermoresponsive behavior. Due to the strong hydrophilic feature of P[P4,4,4,6][MC3S] and the special IPN structure, PNIPAM and P[P4,4,4,6][MC3S] moieties exhibited different phase transition tendencies during heating. In detail, the dehydration behavior of the PNIPAM part seemed gradual and continuous, whereas that of ester C[double bond, length as m-dash]O in the P[P4,4,4,6][MC3S] part became sharp. The two components dehydrated independently and successively in the polymer mixture without any mutual interaction. The collapse of the P[P4,4,4,6][MC3S] network at the second transition stage increased the amount of intramolecular hydrogen bonding (amide C[double bond, length as m-dash]O⋯D–N) in the PNIPAM moiety. Additionally, the electrostatic interaction in the P[P4,4,4,6][MC3S] network played a non-ignorable role in enhancing the swelling property of PNIPAM/P[P4,4,4,6][MC3S] IPN microgels.

Graphical abstract: The role of unique spatial structure in the volume phase transition behavior of poly(N-isopropylacrylamide)-based interpenetrating polymer network microgels including a thermosensitive poly(ionic liquid)

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Jan 2018, accepted on 23 Feb 2018 and first published on 23 Feb 2018


Article type: Paper
DOI: 10.1039/C8CP00340H
Citation: Phys. Chem. Chem. Phys., 2018,20, 8077-8087
  •   Request permissions

    The role of unique spatial structure in the volume phase transition behavior of poly(N-isopropylacrylamide)-based interpenetrating polymer network microgels including a thermosensitive poly(ionic liquid)

    L. Ma and P. Wu, Phys. Chem. Chem. Phys., 2018, 20, 8077
    DOI: 10.1039/C8CP00340H

Search articles by author

Spotlight

Advertisements