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. 2024 Aug 29;16(17):2447.
doi: 10.3390/polym16172447.

Block Copolymers of Poly(N-Vinyl Pyrrolidone) and Poly(Vinyl Esters) Bearing n-alkyl Side Groups via Reversible Addition-Fragmentation Chain-Transfer Polymerization: Synthesis, Characterization, and Thermal Properties

Nikoletta Roka  1 , Theodosia-Panagiota Papazoglou  1 , Marinos Pitsikalis  1
Affiliations

Block Copolymers of Poly(N-Vinyl Pyrrolidone) and Poly(Vinyl Esters) Bearing n-alkyl Side Groups via Reversible Addition-Fragmentation Chain-Transfer Polymerization: Synthesis, Characterization, and Thermal Properties

Nikoletta Roka et al. Polymers (Basel). .

Abstract

Amphiphilic block copolymers of N-vinyl pyrrolidone (NVP) and various vinyl esters (VEs), PNVP-b-PVEs, namely vinyl butyrate (VBu), vinyl decanoate (VDc), and vinyl stearate (VSt), were synthesized through RAFT polymerization techniques. The sequential addition of the monomers methodology was employed starting from the polymerization of NVP followed by the polymerization of the Ves' monomer. The polymerization of NVP was conducted at 60 °C in benzene solution using AIBN as the initiator and O-ethyl S-(phthalimidylmethyl) xanthate as the CTA. The resulting PNVP macro-CTA was further applied for the polymerization of the vinyl ester in dioxane solution at 80 °C using, again, AIBN as the initiator. The block copolymers were characterized through size-exclusion chromatography (SEC) and NMR spectroscopy. The thermal behavior of the copolymers was studied by Differential Scanning Calorimetry (DSC), whereas their thermal stability via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG).

Keywords: RAFT polymerization; block copolymers; poly(N-vinyl pyrrolidone) (NVP); poly(vinyl esters) (VEs); thermal analysis; thermal stability.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Scheme 1
Scheme 1
Synthesis of the PNVP-b-PVE block copolymers via RAFT polymerization.
Figure 1
Figure 1
SEC traces from the synthesis of the block copolymers PNVP-b-PVBu #1, PNVP-b-PVDc #3, and PNVP-b-PVSt #4.
Figure 2
Figure 2
1H NMR spectrum of the block copolymer PNVP-b-PVBu #2.
Figure 3
Figure 3
DSC thermograms of the PNVP-b-PVBu copolymers at 10 °C/min.
Figure 4
Figure 4
DSC thermograms of the PNVP-b-PVDc copolymers at 10 °C/min.
Figure 5
Figure 5
DSC thermograms of the PNVP-b-PVSt copolymers at 10 °C/min.
Figure 6
Figure 6
TGA plots of the PNVP-b-PVBu copolymers at 10 °C/min.
Figure 7
Figure 7
TGA plots of the PNVP-b-PVDc copolymers at 10 °C/min.
Figure 8
Figure 8
TGA plots of the PNVP-b-PVSt copolymers at 10 °C/min.
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