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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermal degradation of poly(alkyl methacrylate) synthesized via ATRP using 2,2,2-tribromoethanol as initiator

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Rodrigues Camilo, Ana Paula [1] ; de Almeida, Paula [1] ; Petzhold, Cesar Liberato [2] ; Felisberti, Maria Isabel [1]
Total Authors: 4
[1] Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
[2] Univ Fed Rio Grande do Sul, Inst Chem, PO 15003, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Polymer Degradation and Stability; v. 158, p. 1-13, DEC 2018.
Web of Science Citations: 2

Poly(alkyl methacrylate)s (alkyl = methyl, ethyl, n-butyl and n-hexyl) synthesized by Atom Transfer Radical Polymerization (ATRP) using 2,2,2 tribromoethanol as initiator present a first mass loss below 200 degrees C in thermogravimetric experiments. In order to investigate the possible mechanism of this degradation step, the polymers were subjected to thermal treatment at 150 degrees C under argon atmosphere. The volatiles were analyzed by gas chromatography coupled to mass spectrometry, while the thermally treated polymers were analyzed by thermogravimetry, H-1 and C-13 nuclear magnetic resonance and size exclusion chromatography. The main mechanism of the first step of degradation is HBr elimination from initiator fragments attached to the chain ends, resulting in vinylidene, lactone and aldehyde terminal groups of the polymer chains. Moreover, volatiles produced by the chain-end elimination were mainly alkyl bromides, alkyl alcohols, alkyl methacrylates and products successive to HBr elimination and polymer chain scission. The amount of monomer release at 150 degrees C varied with the alkyl group in the range of 3-17 wt %; however, polymer chain configuration, molar mass and dispersity did not significantly change. Polymer chains free of the ATRP initiator were thermally stable at least up to 250 degrees C. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/17804-7 - Polymeric composites
Grantee:Maria Isabel Felisberti
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/03394-8 - Synthesis of amphiphilic and block copolymers via RAFT and ATRP
Grantee:Maria Isabel Felisberti
Support type: Research Grants - Visiting Researcher Grant - Brazil
FAPESP's process: 13/09277-5 - Synthesis of amphiphilic block copolymers based on poly(sucrose methacrylate)
Grantee:Paula de Almeida
Support type: Scholarships in Brazil - Master
FAPESP's process: 15/25406-5 - Organizing matter: colloids formed by association of surfactants, polymers and nanoparticles
Grantee:Watson Loh
Support type: Research Projects - Thematic Grants