Charged groups synergically enhanced elasticity and tunable swelling/shrinking of poly(dialkylaminoethyl methacrylate)/layered silicate nanocomposite cryogels

Beril Tanc, Nermin Orakdogen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A thorough understanding of inorganic clay-multifunctional polymer interactions of weakly basic polyelectrolyte systems is critical for the improvement of their thermal, pH- and ionic strength-response to serve in biomedical applications. Poly(dialkylaminoethyl methacrylate)-based polymer-clay nanocomposites were synthesized by (cryo)polymerization and conventional crosslinking of weakly basic N,N-dimethylaminoethyl methacrylate (DMAEMA) and anionic 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) between interlayer spacing of montmorillonite (MMT) layered silicate using the redox-initiator system; APS-TEMED. Formation mechanism as well as thermal stability of nanocomposite cryogels (referred as NC-Cgs/MMTn) and nanocomposite hydrogels (referred as NC-Hgs/MMTn) incorporated with various amount of inorganic clay MMT were characterized by uniaxial compression testing, FTIR, XRD and TGA analysis. At low MMT concentrations, equilibrium swelling of NC-Cgs/MMTn and NC-Hgs/MMTn gels in water increased but then, decreased with further increasing the clay concentration. Correspondingly, compressive modulus of the nanocomposite gels exhibited a distinct minimum with respect to MMT concentration. The nanocomposite gels had stronger mechanical strength and larger volume swelling ratio than those for clay-free gels for MMT concentrations ranging from 0.20 to 3.40% (w/v). From the data obtained by compressive measurements, the network chain-length distribution in the nanocomposite networks with respect to MMT concentration was discussed. The results obtained provided more insights into ionic strength-tunable swelling of slightly charged dialkylaminoethyl methacrylate-based polymer-clay nanocomposite gels and supported the development of potential applications combining the swelling and mechanical properties of weakly basic nanocomposite gels as biomedical materials.

Original languageEnglish
Article number121627
JournalPolymer
Volume178
DOIs
Publication statusPublished - 12 Sept 2019

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Funding

The present work was supported by Istanbul Technical University Research Fund (Project number: TGA-2017-40763). The present work was supported by Istanbul Technical University Research Fund (Project number: TGA-2017-40763 ).

FundersFunder number
Istanbul Technical University Research Fund
Istanbul Teknik ÜniversitesiTGA-2017-40763

    Keywords

    • Cryogel
    • Elasticity
    • Montmorillonite
    • N,N-dimethylaminoethyl methacrylate
    • Nanocomposites

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