Effect of the Z‐ and Macro‐R‐Group on the Thermal Desulfurization of Polymers Synthesized with Acid/Base “Switchable” Dithiocarbamate RAFT Agents

• Published in: Macromolecular rapid communications. 2018-10, Vol.39 (19), p.e1800228-n/a
• Main Authors: Stace, Sarah J., Fellows, Christopher M., Moad, Graeme, Keddie, Daniel J.
• Format: Article
• Language: English
• Subjects: Acetic acid; Addition polymerization; Chain transfer; Chemical synthesis; Degradation; Desulfurization; Desulfurizing; dithiocarbamate; end groups; Isopropylacrylamide; Models, Chemical; Monomers; Polymerization; Polymers; Polymers - chemical synthesis; Polymers - chemistry; Polymethyl methacrylate; RAFT; Styrene; Thermogravimetric analysis; thermogravimetric analysis (TGA); thermolysis; Vinyl acetate
• ISSN: 1022-1336; 1521-3927
• DOI: 10.1002/marc.201800228

Thermolysis is examined as a method for complete desulfurization of reversible addition‐fragmentation chain transfer (RAFT)‐synthesized polymers prepared with acid/base “switchable” N‐methyl‐N‐pyridyldithiocarbamates [RS2CZ or RS2CZH+]. Macro‐RAFT agents from more activated monomers (MAMs) (i.e., styrene (St), N‐isopropylacrylamide (NIPAm), and methyl methacrylate (MMA)) with RS2CZH+ and less activated monomers (LAMs) (i.e., vinyl acetate (VAc) and N‐vinylpyrolidone (NVP)) with RS2CZ are prepared by RAFT polymerization and analyzed by thermogravimetric analysis. In all cases, a mass loss consistent with loss of the end group (ZCS2H) is observed at temperatures lower than, and largely discrete from, that required for further degradation of the polymer. The temperatures for end group loss and the new end groups formed are strongly dependent on the identity of the R(P)n and the state of the pyridyl Z group; increasing in the series poly(MMA) < poly(St) ∼ poly(NIPAm)