Thermal stability of styrene/n-butyl acrylate RAFT-based copolymers

Abstract

Homopolymer of n-butyl acrylate and styrene/n-butyl acrylate copolymers, where n-butyl acrylate units are linked to the trithiocarbonate group, are more thermally stable as compared with homopolymer of styrene and similar copolymers containing styrene units linked to this group.

Synthesis of amphiphilic copolymers based on acrylic acid, fluoroalkyl acrylates and n-butyl acrylate in organic, aqueous–organic, and aqueous media via RAFT polymerization

“…In the course of the polymerization, the molar fraction of acrylic acid-acrylic acid dyads is high due to the high content of this monomer in the feed mixture. Hence, as a result of the living mechanism and the use of the symmetrical trithiocarbonate (BTC) that provides the chain growth in two directions 56 with respect to trithiocarbonate group, one can expect the formation of the random copolymers, in which uoroalkyl acrylate units will be located closer to the both tails of the macromolecules.…”

Emulsifier‐free reversible addition–fragmentation chain transfer emulsion polymerization of alkyl acrylates mediated by symmetrical trithiocarbonates based on poly(acrylic acid)

“…Nevertheless, we tried to estimate the locus of the trithiocarbonate group in the product formed during the induction period. In order to do this, we performed the reaction of the polymer formed after 5 min of polymerization with an excess of initiator using the procedure described by Chernikova et al . If the structure of the formed macromolecules is P n SC(=S)SP m , then upon heating with excess of radical initiator a consequent cleavage of polymeric substituents from the macromolecule should occur and the released macroradicals should be terminated by the initiator radicals.…”

“…Figure illustrates the absorption spectra of the polymers taken at the same weight concentration. As seen from the UV–visible spectra, an intense maximum at 305–307 nm which corresponds to absorption of the trithiocarbonate group is observed. The absorption maximum intensity slightly decreases upon increase of the polymerization time.…”

“…where shorter PAA was used with a hydrophobic terminal –SC(=S)S–C 12 H 25 group, PAATC with the –SC(=S)S– group in the chain is rapidly chain‐extended which leads to the formation of block copolymers with a short hydrophobic block. The slight change in molecular weight and the number of possible reactions resulting in a change of the locus of the –SC(=S)S– group in the chain make difficult a reliable estimation of the exact structure of block copolymers formed at this stage by aminolysis or by performing the reaction with excess of initiator …”

A translation of the structure of mussel byssal threads into synthetic materials by the utilization of histidine-rich block copolymers

“…S7b-S14b †). 33 In addition, the glass transition temperatures (T g ) of all materials are listed in Table S1 † and the DSC curves are depicted in Fig. S7a-S14a.…”