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. 2022 Nov 29;47(1):185-195.
doi: 10.55730/1300-0527.3528. eCollection 2023.

Synthesis and kinetic analysis of poly(N-acryloylmorpholine) brushes via surface initiated RAFT polymerization

Esma Mutlutürk  1 , Tuncer Çaykara  2
Affiliations

Synthesis and kinetic analysis of poly(N-acryloylmorpholine) brushes via surface initiated RAFT polymerization

Esma Mutlutürk et al. Turk J Chem. .

Abstract

Polymer brushes are promising many applications as smart materials and biocompatible surfaces. Surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization is one of the most effective techniques for synthesis of well-defined polymer brushes. Herein, a biocompatible, uniform and stable poly(N-acryloylmorpholine)-silicon hybrid system was achieved using surface-initiated RAFT polymerization. Evidence of a well-controlled surface-initiated RAFT polymerization was confirmed by a linear increase of number average molecular weight (Mn) with overall monomer conversions. Water contact angle, ellipsometry, X-ray photoelectron spectroscopy and atomic force microscopy verified the presence of poly(N-acryloylmorpholine) (poly(NAM)) on silicon wafers. The grafting density (σ) and the average distance between grafting points (D) were estimated to be 0.58 chains/nm2 and 1.5 nm, respectively. The ratio of D value to radius of gyration (Rg) value is smaller than 1 (D/2Rg < 1), which corresponds to the brush regime of all grafted poly(NAM) films.

Keywords: Polymer brushes; poly(N-acryloyl morpholine); surface-initiated RAFT polymerization.

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Conflict of interest statement

Conflict of interest The authors declare that there is no conflict of interest.

Figures

Figure 1
Figure 1
Diagram for synthesis of Si-g-poly(NAM) brushes.
Figure 2
Figure 2
2D-3D AFM images (5 × 5 μm) and water contact angle photograph for Si-H surfaces.
Figure 3
Figure 3
(a) GA-FTIR, (b) O1s, C1, Si2s and Si2p core-level XPS spectra (c) survey scan XPS spectra, (d) 2D-3D AFM images (5 × 5 μm) and water contact angle photograph of Si-ED surfaces.
Figure 4
Figure 4
(a) GA-FTIR, (b) survey scan XPS spectra, (c) O1s, C1, S2p, Si2s and Si2p core-level XPS spectra, (d) 2D-3D AFM images (5 × 5 μm) and water contact angle photograph of Si-BPAT surfaces.
Figure 5
Figure 5
Relationships for (a) film thickness-polymerization time, (b) % conversion-polymerization time, (c) molecular weight – % conversion, (d) ln ([M]0/[M]t) - polymerization time, (e) film thickness-molecular weights.
Figure 6
Figure 6
(a) GA-FTIR spectra and (c) core-level XPS spectra of Si-g-poly(NAM) surfaces for all polymerization times, (b) O1s, C1, S2p, Si2s and Si2p of Si-g-poly(NAM) surface.
Figure 7
Figure 7
2D-3D AFM images (5 × 5 μm) and water contact angle photograph for polymer brushes synthesized for different reaction time a) 2 h, b) 4 h, c) 6 h, d) 8 h.
See this image and copyright information in PMC

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