TY  - JOUR
A1  - Demirel, A. Levent
A1  - Guner, Pinar Tatar
A1  - Verbraeken, Bart
A1  - Schlaad, Helmut
A1  - Schubert, Ulrich S.
A1  - Hoogenboom, Richard
T1  - Revisiting the Crystallization of Poly(2-alkyl-2-oxazoline)s
JF  - Journal of polymer science : B, Polymer physics
N2  - Poly(2-alkyl-2-oxazoline)s (PAOx) exhibit different crystallization behavior depending on the length of the alkyl side chain. PAOx having methyl, ethyl, or propyl side chains do not show any bulk crystallization. Crystallization in the heating cycle, that is, cold crystallization, is observed for PAOx with butyl and pentyl side chains. For PAOx with longer alkyl side chains crystallization occurs in the cooling cycle. The different crystallization behavior is attributed to the different polymer chain mobility in line with the glass transition temperature (T-g) dependency on alkyl side chain length. The decrease in chain mobility with decreasing alkyl side chain length hinders the relaxation of the polymer backbone to the thermodynamic equilibrium crystalline structure. Double melting behavior is observed for PButOx and PiPropOx which is explained by the melt-recrystallization mechanism. Isothermal crystallization experiments of PButOx between 60 and 90 degrees C and PiPropOx between 90 and 150 degrees C show that PAOx can crystallize in bulk when enough time is given. The decrease of Tg and the corresponding increase in chain mobility at T > T-g with increasing alkyl side chain length can be attributed to an increasing distance between the polymer backbones and thus decreasing average strength of amide dipole interactions. (C) 2015 Wiley Periodicals, Inc.
KW  - chain mobility
KW  - crystallization
KW  - differential scanning calorimetry (DSC)
KW  - effect of alkyl side chains
KW  - glass transition temperature
KW  - melt
KW  - melt-recrystallization
KW  - polymer crystallization
Y1  - 2016
U6  - https://doi.org/10.1002/polb.23967
SN  - 0887-6266
SN  - 1099-0488
VL  - 54
SP  - 721
EP  - 729
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Khodeir, Miriam
A1  - Ernould, Bruno
A1  - Brassinne, Jeremy
A1  - Ghiassinejad, Sina
A1  - Jia, He
A1  - Antoun, Sayed
A1  - Friebe, Christian
A1  - Schubert, Ulrich S.
A1  - Kochovski, Zdravko
A1  - Lu, Yan
A1  - Van Ruymbeke, Evelyne
A1  - Gohy, Jean-Francois
T1  - Synthesis and characterisation of redox hydrogels based on stable nitroxide radicals
JF  - Soft matter
N2  - The principle of encapsulation/release of a guest molecule from stimuli responsive hydrogels (SRHs) is mainly realised with pH, temperature or light stimuli. However, only a limited number of redox responsive hydrogels have been investigated so far. We report here the development of a SRH that can release its guest molecule upon a redox stimulus. To obtain this redox hydrogel, we have introduced into the hydrogel the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) stable nitroxide radical, which can be reversibly oxidized into an oxoammonium cation (TEMPO+). Water solubility is provided by the presence of the (oligoethyleneglycol)methacrylate (OEGMA) comonomer. Electrochemical and mechanical characterization showed that those gels exhibit interesting physicochemical properties, making them very promising candidates for practical use in a wide range of applications.
Y1  - 2019
U6  - https://doi.org/10.1039/c9sm00905a
SN  - 1744-683X
SN  - 1744-6848
VL  - 15
IS  - 31
SP  - 6418
EP  - 6426
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Jia, He
A1  - Friebe, Christian
A1  - Schubert, Ulrich S.
A1  - Zhang, Xiaozhe
A1  - Quan, Ting
A1  - Lu, Yan
A1  - Gohy, Jean-Francois
T1  - Core-Shell Nanoparticles with a Redox Polymer Core and a Silica Porous Shell as High-Performance Cathode Material for Lithium-Ion Batteries
JF  - Energy technology : generation, conversion, storage, distribution
N2  - A facile and novel method for the fabrication of core-shell nanoparticles (PTMA@SiO2) based on a poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methacrylate) (PTMA) core and a porous SiO2 shell is reported. The core-shell nanoparticles are further self-assembled with negatively charged multi-walled carbon nanotubes (MWCNTs), which results in the formation of a free-standing cathode electrode. The porous SiO2 shell not only effectively improves the stability of the linear PTMA redox polymer with low molar mass in organic electrolytes but also leads to the uniform dispersion of PTMA active units in the MWCNTs conductive network. The PTMA@SiO2@MWCNT composite electrode exhibits a specific capacity as high as 73.8 mAh g at 1 C and only 0.11% capacity loss per cycle at a rate of 2 C.
KW  - composite electrodes
KW  - core-shell nanoparticles
KW  - energy storage
KW  - lithium-ion batteries
KW  - redox polymers
Y1  - 2019
U6  - https://doi.org/10.1002/ente.201901040
SN  - 2194-4288
SN  - 2194-4296
VL  - 8
IS  - 3
PB  - Wiley-VCH
CY  - Weinheim
ER  -