The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
New AB diblock copolymer in-chain anions having poly(2-vinylpyridine) (P2VP) and/or poly(methyl methacrylate) (PMMA) blocks, whose anion is located at the junction between the A and B blocks, have been prepared by the 1:1 addition reaction of the living polymer (A) with the ω- or α-terminal 1-phenyl-1-(2-pyridinyl)ethylene-functionalized polymer (B). The P2VP-block-PS, PS-block-P2VP, P2VP-block-poly(4-tert-butyldimethylsilyloxystyrene),...
A facile synthesis of multifunctional hindered phenolic macromolecular antioxidants based on hyperbranched polyglycerol (HbPG) nanoparticles as cores with different molecular weights is reported. The structure of the resulting polymers was verified by 1H NMR and UV–Vis spectroscopies indicating 64–77% antioxidant functionalizations of the hydroxyl groups of the HbPGs. GPC analyses show that polymeric...
The aim of this research was to study the effect of charge polarity applied to the spinning nozzle on the structure and properties of polycaprolactone/chitosan (PCL/CHT) blends, in particular the efficiency of further surface modification by chondroitin sulphate (CS). The observed differences in the morphology and properties of fibres formed at different polarities were interpreted in terms of molecular...
Cracks generated in materials affect comprehensive performance and shorten service life of materials. The problem is expected to be resolved by endowing materials with self-healing property. Herein, a new thermoplastic polyurethane with excellent self-healing performance (PU-DA) has been developed, while the self-healing behavior is investigated by qualitative observation and quantitative measuring...
A photocrosslinked membrane (M-Cl) based on vinyl-pyrrolidone/butyl acrylate containing ethylene glycol dimethacrylate as a crosslinking agent and methacryloyl chloride as reactive monomer has been prepared for further functionalization. A series of hydroxy substituted piperazine naphthalimide compounds have been synthetized as pH sensitive Off-On fluorescence probes using two methods: microwave and...
A comparative study was prepared investigating the synthesis of polyamides using bio-based building blocks derived from sugar beet pulp, namely 2,3:4,5-di-O-methylene-galactarate (GalXH) and 2,3:4,5-di-O-isopropylidene-galactarate (GalXMe) derivatives. Two different approaches towards the synthesis of bio-based polyamides were evaluated: melt polycondensation and direct polycondensation in solution...
In this paper, we synthesized two types of epoxy group containing POSS derivatives: mono and poly Double-Decker Silsesquioxanes (mono DDSQ and poly DDSQ). The performance of epoxy resin with different DDSQ loading ratios was investigated, including curing kinetics, thermal, mechanical and surface properties. Both mono and poly DDSQ significantly improved thermal and mechanical properties of the epoxy...
The isothermal vacuum-induced dehydration of thin films made of poly(methoxy diethylene glycol acrylate) (PMDEGA), which were swollen under ambient conditions, is studied. The dehydration behavior of the homopolymer film as well as of a nanostructured film of the amphiphilic triblock copolymer polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene, abbreviated as PS-b-PMDEGA-b-PS,...
Polyphenylsulfone (PPSU) was employed to fabricate novel alkali resisting ultrafiltration membranes via phase inversion process and the membrane structure was tailored by adjusting the kinetics of phase separation. The effects of polyvinylpyrrolidone (PVP) molecular weight (Mw) and concentration on the casting solution and the performance of PPSU membrane such as tensile strength, morphology, hydrophilicity,...
The kinetics of isothermal melt-crystallization of poly (butylene terephthalate) (PBT) has been evaluated in a wide temperature range from below the glass transition temperature Tg to close to the equilibrium melting temperature, using fast scanning chip calorimetry. Analysis of heating scans recorded after pre-defined crystallization times permitted gaining valuable information about the effect of...
The interactions of cellulose with other major plant cell wall polysaccharides - arabinoxylan (AX), xyloglucan (XG) and mixed linkage glucans (MLG) - have been investigated by characterising the architecture of composite deuterated cellulose hydrogels by means of SAXS and SANS, combined with XRD, NMR and microscopy. The results indicate that cellulose-AX interactions, limited to the ribbons' surface,...
The miscibility, crystalline structure and morphology, as well as, properties of Polyamide 6 (PA6)/polyvinylidene fluoride (PVDF) blends (with up to 50 wt% of PVDF) were studied. Small Angle X-ray Scattering study above the melting point of PVDF shows that the blends have very limited miscibility with approximately 5 wt% of PVDF inclusion in PA6 amorphous lamellar region. SAXS results also indicate...
Intensive research has recently been carried out to synthesize non-isocyanate polyurethanes (NIPUs) from five-membered cyclic carbonates and amines as a sustainable route to industrial relevant polyurethanes. Herein, an activated disubstituted cyclic carbonate and methyl ester containing monomer CE was prepared using castor oil based heptanal and CO2. Good results for the catalytic cycloaddition have...
Low band gap polythiophenylpyrazoline containing fluorene and benzothiadiazole moieties were synthesized and characterized in combination with high donor content (PFPF) and high acceptor content (PBPF). The PBPF displays broad emission as white light dual fluorescence via locally excited state and charge transfer state as single polymer, while PFPF exhibits blue light emission. This dual emission...
Series of alternating conjugated copolymers of thiophene-based monomers substituted with bulky and electron withdrawing 1,2,3-triazole and 1,3,4-oxadiazole pendant groups was synthesized and characterized. Either a Suzuki coupling approach with 1,4-phenylene, 2,5-bis(octyloxy)-1,4-phenylene and 9,9-Dioctylfluorene-2,7-diyl boronates or the Stille reaction with 2,5-thiophenediyl stannane was used for...
A series of wholly amorphous linear aliphatic co- and tetra-polyesters were synthesized via bulk melt step-growth polymerization. Their glass transition temperatures were determined using DSC and were essentially unaffected by crystallinity. The glass transition temperatures of the polyesters increase linearly with the ratio of ester groups per methylene group. Extrapolations of the ratio to zero...
Polystyrene-block-polyisoprene-block-polylactide-block-polystyrene tetrablock terpolymers were synthesized via sequential anionic, ring-opening, and reversible addition-fragmentation chain-transfer polymerizations. The optimized synthesis of these ABCA' tetrablock terpolymers yields polymers with low molar mass dispersity and allowed for straightforward and independent tuning of the Mn for each block...
Hydroxy-terminated 4-armed star-shaped ɛ-caprolactone and l-lactide oligomers (H4CLOn and H4LAOn) with a degree of polymerization per arm (n = 5, 10 or 15) were reacted with furfuryl isocyanate and (4-maleimidophenyl)isocyanate to produce furan- and maleimide-functionalized 4-armed star-shaped ɛ-caprolactone and l-lactide oligomers (F4CLOn and M4LAOn), respectively. The Diels-Alder (DA) reaction of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.