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Synthesis and behaviour of PEG-b-PDEAm block copolymers in aqueous solution
- Source :
- Materials Today Communications, Materials Today Communications, Elsevier, 2020, 24, pp.100987. ⟨10.1016/j.mtcomm.2020.100987⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- International audience; Well-defined double hydrophilic block copolymers (DHBCs) of poly(ethylene glycol)-block-poly(N,N-diethyla-crylamide) (PEG-b-PDEAm) were synthesized via a reversible addition-fragmentation chain-transfer (RAFT) polymerization of N,N-diethylacrylamide (DEAm) using dithioester terminated PEG of different chain lengths as macro-chain transfer agents. Controlled molecular weight and narrow molecular weight distribution were achieved as proven by size exclusion chromatography (SEC). Cloud points (CP) were determined via turbidity measurements with ultraviolet-visible spectroscopy (UV-vis) and LCST by differential scanning micro-calori-metry (micro-DSC). They range from 32 to 40°C depending on the PDEAm length block and its concentration. Above the LCST, fluorescence spectroscopy and dynamic light scattering (DLS) demonstrated that the PEG-b-PDEAm copolymers self-organized into large aggregates. More interestingly, copolymers pre-aggregated at relatively high concentrations below the LCST.
- Subjects :
- Materials science
Size-exclusion chromatography
N-diethylacrylamide
02 engineering and technology
010402 general chemistry
thermosensitive polymers
01 natural sciences
Lower critical solution temperature
Fluorescence spectroscopy
chemistry.chemical_compound
Dynamic light scattering
Materials Chemistry
Copolymer
[CHIM]Chemical Sciences
General Materials Science
technology, industry, and agriculture
behaviour in aqueous solution)
(N
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Chemical engineering
chemistry
Polymerization
Mechanics of Materials
Molar mass distribution
0210 nano-technology
Ethylene glycol
RAFT
Subjects
Details
- Language :
- English
- ISSN :
- 23524928
- Database :
- OpenAIRE
- Journal :
- Materials Today Communications, Materials Today Communications, Elsevier, 2020, 24, pp.100987. ⟨10.1016/j.mtcomm.2020.100987⟩
- Accession number :
- edsair.doi.dedup.....1d940b609c3da4169cbcbdb66d8100a8