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H-bonding organocatalysis using (thio)urea/amine achieved massive success. H-bonding binding with Brønsted acid catalysis, especially in polymerizations, was scarcely explored. Here we disclosed 1,3-bis-(3,5-bis(trifluoromethyl)phenyl)thiourea (TU) as hydrogen bond donor (HBD), combined with trifluoroacetic acid (TFA) as a Brønsted acid (BA), promoted efficient controlled/living ring-opening polymerization...
The plasticisation of carnauba wax has been examined by adding generally recognised as safe (GRAS) molecules of branched structures in order to disrupt the orderly packed molecules within the wax. The effectiveness of a range of different potential GRAS plasticisers was assessed by mechanical characterisation based on flexural and indentation measurements to determine parameters such as flexural strain...
Water-insoluble poly(N-vinylcaprolactam) (PVCL) electrospun nanofibres have been prepared for the first time by direct electrospinning with Tannic acid (TA) in apolar protic solvents. The PVCL/TA nanofiber mats have been fabricated through a facile one-step procedure which will increase their potential applications in the biomedical field where material stability in an aqueous environment is crucial...
Novel supramolecular polypropylenes (PP) having self-complementary quadruple hydrogen bonding 2-ureido-4[1H]-pyrimidinone (UPy) groups (UPy-PP) have been synthesized by functionalizing of PP. The mechanical properties donated by the network structure formed by the multiple hydrogen bonding were studied with rheological analyses and tensile tests of the UPy-PP. Unusual melt viscosity of the UPy-PP...
Water sorption thermodynamics in poly-propylene sebacate, PPSeb, a biodegradable semi-crystalline polyester, has been studied above its glass transition temperature. Experimental results have been obtained by using gravimetric methods to determine water sorption isotherms at several temperatures, as well as by means of in-situ FTIR transmission spectroscopy, to obtain qualitative information and quantitative...
A new 2,6-diaminopyridine-functionalized SG1-based alkoxyamine has been synthesized and used to prepare a well-defined functional copolymer (poly(styrene-co-2-vinyl-4,4-dimethyl-5-oxazolone) – poly(S-co-VDM)) by nitroxide mediated polymerization. After post-modification of the copolymer with an atom transfer radical polymerization (ATRP) ligand (N,N-dipicolyl propylamine), the macroligand was successfully...
Tetrathiafulvalene molecules substituted with a carboxylic acid group (TTFCOOH) were bound as redox-active moieties into a poly(4-vinyl pyridine) (P4VP) skeleton through non-covalent interactions (hydrogen bonds). The aspect of the resulting P4VP-TTFCOOH films showed a uniform and smooth morphology. Moreover, the redox function of TTFCOOH in P4VP-TTFCOOH was demonstrated using tetrachloroauric acid,...
In this work, perturbed-chain statistical associating fluid theory (PC-SAFT) and its combination with the NET-GP (non-equilibrium thermodynamics of glassy polymer) model were both used to better understand both CO2 and water sorption in glassy polymers. For CO2 sorption in poly(methyl methacrylate) (PMMA) the NET PC-SAFT model provides excellent predictions, reflective of the glassy state of this...
The rheological behavior of hydroxyl-functionalized polypropylene (PPOH) copolymers modified with up to 3.9 mol% hydroxyl groups was compared with unmodified polypropylene (PP) in the melt state. The hydroxyl groups interacted via hydrogen (H-) bonding, the strength of which increased with increasing hydroxyl concentration. The hydrogen bonds persisted at temperatures as high as 250 °C, even though...
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