Search results for " copolymer"

showing 10 items of 160 documents

Heparin functionalized polyaspartamide/polyester scaffold for potential blood vessel regeneration

2013

Settore CHIM/09 - Farmaceutico Tecnologico Applicativovascular graft tissue engineering electrospinning graft copolymer heparin
researchProduct

Small angle scattering study of poly(methylmethacrylate)-block-poly(ethylene oxide) block co-polymer in aqueous solution

2005

A combined Small Angle X ray (SAXS) and Neutron (SANS) Scattering study of aqueous solutions of a symmetric block copolymer consisting of poly(methyl methacrylate) (PMMA) and poly(ethylene oxide) (PEO) moieties is presented. The polymer forms slightly polydisperse spherical micelles in a wide range of concentration (0.03 – 6.7 w/V) and temperature (20°C ≤ T ≤ 65°C). A good description of the SANS data is obtained using a polydisperse core-shell model with a structure factor for a modified hard sphere potential. By increasing the concentration at constant T we observed a decrease of the aggregation number and an increase of solvation of PEO groups in the shell, opposite to what happens by in…

Small Angle Scattering Di-Block Copolymer Micelles Structuretechnology industry and agriculture
researchProduct

Improvement of the photo-stability of polystyrene-block-polybutadiene-block-polystyrene through carbon nanotubes

2015

Abstract The photo-stability of Polystyrene-Polybutadiene-Polystyrene (SBS) based nanocomposites containing bare multi-walled carbon nanotubes (CNTs) and carbon nanotubes bearing carboxylic functional groups (CNTs-COOH) in comparison to that of pristine SBS has been studied. The photo-oxidation of pristine SBS occurs through crosslinking reactions and oxidized species formation and both these processes begin at early stage of exposure. The formation of crosslinking, formerly in polybutadiene phase, assessed by spectroscopical (FTIR), mechanical, dynamic mechanical and rheological analysis, leads to occurrence of internal mechanical stresses in the solid state and the SBS samples become prem…

Solid-state chemistryPolystyrene-polybutadiene-polystyrene copolymerMaterials sciencePolymers and PlasticsCarbon nanotubesCarbon nanotubes; Photo-stability; Polystyrene-polybutadiene-polystyrene copolymer; Structural changes; Condensed Matter Physics; Mechanics of Materials; Polymers and Plastics; Materials Chemistry; 2506; Metals and AlloysCarbon nanotubeCarbon nanotubelaw.inventionchemistry.chemical_compoundPolybutadieneRheologylawPhase (matter)Structural changeMaterials ChemistryMechanics of MaterialFourier transform infrared spectroscopyComposite materialStructural changesNanocompositePolymers and PlasticMetals and AlloysCondensed Matter PhysicsPhoto-stabilitychemistryChemical engineeringMechanics of MaterialsPolystyrene2506
researchProduct

Solubilisation of Chlorinated oils in triblock copolymers-surfactant mixed aggregates

2006

Solubilisation copolymer surfactantSettore CHIM/02 - Chimica Fisica
researchProduct

Solubilization of oils in aqueous solution of star-like block copolymer with thermo- and pH-sensitive features

2010

Solubilization copolymer thermodynamics
researchProduct

Free radical copolymerization of vinylidene fluoride and acrylic acid in supercritical carbon dioxide

2010

Supercritical carbon dioxide acrylic acid copolymers free radical polymerizationSettore ING-IND/27 - Chimica Industriale E Tecnologica
researchProduct

Influence of the Preparation Method and Photo-Oxidation Treatment on the Thermal and Gas Transport Properties of Dense Films Based on a Poly(ether-bl…

2018

Dense films based on the hydrophobic Pebax&reg

Thermogravimetric analysisMaterials scienceCompression molding02 engineering and technology010402 general chemistryMass spectrometrylcsh:Technology01 natural sciencesArticleContact angleDifferential scanning calorimetryGeneral Materials Sciencelcsh:Microscopylcsh:QC120-168.85lcsh:QH201-278.5lcsh:TPermeation021001 nanoscience & nanotechnologyMicrostructureCastingphoto-oxidation0104 chemical sciencesChemical engineeringlcsh:TA1-2040poly(ether-block-amide) copolymerlcsh:Descriptive and experimental mechanicslcsh:Electrical engineering. Electronics. Nuclear engineeringlcsh:Engineering (General). Civil engineering (General)0210 nano-technologylcsh:TK1-9971gas transport propertiesMaterials
researchProduct

Anionic Copolymerization Enables the Scalable Synthesis of Alternating (AB)n Multiblock Copolymers with High Molecular Weight in n/2 Steps

2018

Based on the highly disparate reactivities of isoprene (I, rI = 25.4) and 4-methylstyrene (4MS, r4MS = 0.007) in the anionic copolymerization in nonpolar media, a general strategy for the rapid and scalable synthesis of tapered multiblock copolymers with an extremely steep gradient has been developed. A repetitive addition strategy of a mixture of isoprene and 4MS leads to a tapered diblock in each case, giving access to linear alternating multiblock copolymers of the (AB)n type with up to 10 blocks. All multiblock copolymers showed narrow molecular weight distributions (dispersity Đ = 1.04–1.12). High molecular weights in the range of 80 to 400 kg mol–1 were achieved. Due to the incompatib…

ToughnessMaterials sciencePolymers and PlasticsMolecular massOrganic ChemistryDispersityMultiblock copolymer02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesInorganic Chemistrychemistry.chemical_compoundchemistryChemical engineeringMolar ratioMaterials ChemistryCopolymer0210 nano-technologyIsopreneACS Macro Letters
researchProduct

Vascular Endothelial Growth Factor-Releasing Microspheres Based on Poly(ε-Caprolactone-PEG-ε-Caprolactone)-b-Poly(L-Lactide) Multiblock Copolymers In…

2020

Pancreatic islet transplantation is a promising advanced therapy that has been used to treat patients suffering from diabetes type 1. Traditionally, pancreatic islets are infused via the portal vein, which is subsequently intended to engraft in the liver. Severe immunosuppressive treatments are necessary, however, to prevent rejection of the transplanted islets. Novel approaches therefore have focused on encapsulation of the islets in biomaterial implants which can protect the islets and offer an organ-like environment. Vascularization of the device’s surface is a prerequisite for the survival and proper func- tioning of transplanted pancreatic islets. We are pursuing a prevascularization s…

Vascular Endothelial Growth Factor APDMS implantsTime FactorsDrug CompoundingPolyestersPharmaceutical Science02 engineering and technology030226 pharmacology & pharmacyPolyethylene Glycols03 medical and health scienceschemistry.chemical_compound0302 clinical medicinePEG ratioHyaluronic acidHuman Umbilical Vein Endothelial CellsmedicineHumansDimethylpolysiloxanesHyaluronic Aciddiabetes type 1Cells CulturedCell Proliferationmultiblock copolymersDrug ImplantsDrug CarriersPancreatic isletsartificial pancreasBiomaterial021001 nanoscience & nanotechnologyControlled releaseVEGFMicrospheres3. Good healthVascular endothelial growth factorDrug Liberationmedicine.anatomical_structurechemistryPrinting Three-DimensionalAngiogenesis Inducing AgentsPancreatic islet transplantationcontrolled release PDMS implants VEGF multiblock copolymers diabetes type 1 artificial pancreas0210 nano-technologycontrolled releaseCaprolactoneBiomedical engineering
researchProduct

Synthesis of polybutadiene-polycaprolactone multi-blokcs based on hydroxyl telechelic polybutadiene. Composition and kinetic study

2009

International audience

[ CHIM.POLY ] Chemical Sciences/Polymersthermoplastic block copolymerspoly(butadiene[CHIM.POLY] Chemical Sciences/Polymers[CHIM.POLY]Chemical Sciences/PolymersComputingMilieux_MISCELLANEOUSpoly(e-caprolactone)
researchProduct