التفاصيل البيبلوغرافية
| العنوان: |
ATRP-based polymers with modular ligation points under thermal and thermomechanical stress |
| المؤلفون: |
Altintas, Ozcan, Josse, Thomas, Abbasi, Mahdi, De Winter, Julien, Trouillet, Vanessa, Gerbaux, Pascal, Wilhelm, Manfred, Barner-Kowollik, Christopher |
| المصدر: |
Polymer Chemistry |
| بيانات النشر: |
Royal Society of Chemistry (RSC) |
| سنة النشر: |
2015 |
| المجموعة: |
Queensland University of Technology: QUT ePrints |
| مصطلحات موضوعية: |
Activators regenerated by electron transfers, Atom transfer radical polymerization, Bromine, Chains, Copper(i) catalyzed azide alkyne cycloaddition (CuAAC), Desorption, Esterification, Esters, Free radical reactions, Functional groups, Homopolymerization, Mass spectrometry, Matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry, Nitrogen compounds, Nuclear magnetic resonance, Nuclear magnetic resonance spectroscopy, Organic polymers, Photodegradation, Polyacrylates, Polymers, Polystyrene homopolymers, Polystyrenes, Processing condition, Proton nuclear magnetic resonance, Reference material, Size exclusion chromatography, Thermo-mechanical stress, X ray photoelectron spectroscopy |
| الوصف: |
Linear polystyrenes carrying a mid-chain triazole, esters as well as terminal secondary bromines functionalities were synthesized via activators regenerated by electron transfer (ARGET) atom transfer radical polymerization (ATRP) using a bifunctional triazole containing initiator (3.8 kDa ≤ Mn,SEC ≤ 125 kDa, 1.08 ≤ ≤ 1.19) with the aim of understanding their behavior under thermal and thermomechanical stress. As reference materials-isolating the influence of individual functional groups-three polystyrene homopolymers carrying an ω-bromine chain-end functionality, α,ω-ester-bromine functionalities as well as α,ω-dibromine/mid-chain ester functionalities (2 kDa ≤ Mn,SEC ≤ 39 kDa, 1.06 ≤ ≤ 1.08) were prepared via ARGET ATRP. Furthermore, a well-defined triazole mid-chain functionalized block homopolymer, i.e. polystyrene-b-polystyrene (PS-b-PS, Mn,SEC = 4.4 kDa,= 1.08), was synthesized via a combination of ARGET ATRP and copper(i)-catalyzed azide-alkyne cycloaddition (CuAAC) as a reference material. Reference polymers without bromine and with ester/triazole functionalities were additionally investigated. Thermomechanical stress was applied to the polymers via small scale extrusion as well as a rheological assessment (G′(t), G′′(t)) under processing conditions. The thermally challenged polymers were analyzed by size-exclusion chromatography (SEC), matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF-MS), proton nuclear magnetic resonance (1H NMR) and X-ray photoelectron spectroscopy (XPS) to arrive at a detailed image of the degradation susceptibility of individual functional groups, especially esters, bromines and triazole functions. The findings indicate an enhanced degradation of ATRP polymers via an accelerated ester cleavage due to HBr release at high temperatures accompanied by a concomitant molecular weight increase due to the formation of triazolium salts via the reaction of triazole units with bromine terminal chain ends. This journal is © The Royal Society of Chemistry ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
unknown |
| Relation: |
https://eprints.qut.edu.au/99420/1/c5py00036j.pdf; Altintas, Ozcan, Josse, Thomas, Abbasi, Mahdi, De Winter, Julien, Trouillet, Vanessa, Gerbaux, Pascal, Wilhelm, Manfred, & Barner-Kowollik, Christopher (2015) ATRP-based polymers with modular ligation points under thermal and thermomechanical stress. Polymer Chemistry, 6(15), pp. 2854-2868.; https://eprints.qut.edu.au/99420/; Institute for Future Environments |
| الاتاحة: |
https://eprints.qut.edu.au/99420/ |
| Rights: |
free_to_read ; http://creativecommons.org/licenses/by/2.5/ ; Consult author(s) regarding copyright matters ; This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
| رقم الانضمام: |
edsbas.2A21FEE |
| قاعدة البيانات: |
BASE |