Search results for "polymer"

showing 10 items of 10504 documents

Hetero-difunctional dimers as building blocks for the synthesis of poly(amidoamine)s with hetero-difunctional chain terminals and their derivatives

2012

This article reports on a simple and straightforward preparation method of poly(amidoamine)s (PAAs) with hetero-difunctional chain ends as well as of several up to now hardly obtainable PAA derivatives of biotechnological interest, such as for instance PAAs of controlled molecular weight and narrow polydispersity mono-functionalized at one end with an acrylamide group, PAAs with star-like molecular architecture, graft-PAA-protein conjugates, “tadpole-like” PAA conjugates with hydrophobic moieties able to self assemble into nanoparticles in aqueous media. The key step was to design suitable building blocks consisting of hetero-difunctional dimers (HDDs). In particular, the HDDs considered we…

poly(amidoamine)Materials Chemistry2506 Metals and AlloyPolymers and PlasticPolymers and PlasticsChemistrynanoparticleOrganic ChemistryAmidoamineDispersityamphiphileNanoparticlePoly(amidoamine)star polymerchemistry.chemical_compoundChain (algebraic topology)PolymerizationpolyamineAmphiphilePolymer chemistryMaterials Chemistryprotein graftingConjugateJournal of Polymer Science Part A: Polymer Chemistry
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Amino acid-­deriving chiral polymers with potential for biotechnological applications

2017

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poly(amidoamine)s chiral polymers interpenetrating peptides
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Compatibilization of Polylactide/Poly(ethylene 2,5-furanoate) (PLA/PEF) Blends for Sustainable and Bioderived Packaging.

2022

Despite the advantages of polylactide (PLA), its inadequate UV-shielding and gas-barrier properties undermine its wide application as a flexible packaging film for perishable items. These issues are addressed in this work by investigating the properties of melt-mixed, fully bioderived blends of polylactide (PLA) and poly(ethylene furanoate) (PEF), as a function of the PEF weight fraction (1–30 wt %) and the amount of the commercial compatibilizer/chain extender Joncryl ADR 4468 (J, 0.25–1 phr). J mitigates the immiscibility of the two polymer phases by decreasing and homogenizing the PEF domain size; for the blend containing 10 wt % of PEF, the PEF domain size drops from 0.67 &p…

poly(ethylene furanoate)compatibilizationPolymersPolyestersOrganic ChemistryPharmaceutical ScienceEthylenesfuranoatesAnalytical ChemistryOxygenSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiBlendsgas-permeabilityChemistry (miscellaneous)PolyethylenepolylactideDrug DiscoveryblendsMolecular Medicinepolylactide; furanoates; poly(ethylene furanoate); blends; compatibilization; gas-permeability; UV-shieldingUV-shieldingPhysical and Theoretical ChemistryMolecules (Basel, Switzerland)
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Sequestration of biogenic amines by alginic and fulvic acids.

2006

The interaction of natural (alginic and fulvic acids) and synthetic (polyacrylic acid 2.0 kDa) polyelectrolytes with some protonated polyamines [diamines: ethylendiamine, 1,4-diaminobutane (or putrescine), 1,5-diaminopentane (or cadaverine); triamines: N-(3-aminopropyl)-1,4diaminobutane (or spermidine), diethylenetriamine; tetramine: N.N'-bis(3-aminopropyl)-1,4-diaminobutane (or spermine); pentamine: tetraethylene-pentamine; hexamine: pentaethylenehexamine] was studied at T=25 degrees C by potentiometry and calorimetry. Measurements were performed without supporting electrolyte, in order to avoid interference, and results were reported at I=0 mol L(-1). For all the systems, the formation of…

polyammonium-polycarboxylate interactionsAlginatesPolymersBiogenic aminesInorganic chemistryFulvic acidCarboxylic AcidsBiophysicsProtonationCalorimetryBiochemistryMedicinal chemistryElectrolyteschemistry.chemical_compoundbiogenic amineGlucuronic AcidPolyaminesBenzopyransAlginic acidPolyacrylic acidCadaverineChemistryHexuronic AcidsOrganic ChemistryPolyacrylic acidPentaminesequestrationPolyelectrolytesPolyelectrolyteQuaternary Ammonium CompoundsBiogenic amines; Fulvic acid; Alginic acid; Polyacrylic acid; sequestrationModels ChemicalDiethylenetriamineThermodynamicsAmine gas treatingProtonsMathematics
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UN NUOVO METODO PER OTTENERE FILM FLESSIBILI EAA-PANI

2010

polyaniline chemical surface modification hybrid polymers morphology electrical conductivity
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Design of New Polyaspartamide Copolymers for siRNA Delivery in Antiasthmatic Therapy

2020

Here, a novel protonable copolymer was realized for the production of polyplexes with a siRNA (inhibitor of STAT6 expression in asthma), with the aim of a pulmonary administration. The polycation was synthesized by derivatization of &alpha

polyaspartamidelcsh:RS1-441Pharmaceutical Science02 engineering and technologyArticlelcsh:Pharmacy and materia medica03 medical and health scienceschemistry.chemical_compoundpolyaminePEG ratioCopolymerpegylationDerivatization030304 developmental biologySTAT6polyplexechemistry.chemical_classification0303 health sciencesintegumentary systemMucinpolyplexesBiological membranePolymerasthma021001 nanoscience & nanotechnologychemistrysiRNABiophysicsPEGylationAmine gas treating0210 nano-technology
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Acid-Labile Surfactants Based on Poly(ethylene glycol), Carbon Dioxide and Propylene Oxide: Miniemulsion Polymerization and Degradation Studies

2017

Partially degradable, nonionic AB and ABA type di- and triblock copolymers based on poly(propylene carbonate) and poly(ethylene glycol) blocks were synthesized via immortal copolymerization of carbon dioxide and propylene oxide, using mPEG or PEG as a macroinitiator, and (R,R)-(salcy)-CoOBzF5 as a catalyst in a solvent-free one-pot procedure. The amphiphilic surfactants were prepared with molecular weights (Mn) between 2800 and 10,000 g·mol−1 with narrow molecular weight distributions (1.03–1.09). The copolymers were characterized using 1H-, 13C- and DOSY-NMR spectroscopy and size exclusion chromatography (SEC). Surface-active properties were determined by surface tension measurements (crit…

polycarbonate; CO2; surfactant; miniemulsion polymerization; degradation; nanoparticleMaterials sciencePolymers and Plasticssurfactant02 engineering and technology010402 general chemistry01 natural sciencesArticleStyrenelcsh:QD241-441chemistry.chemical_compoundlcsh:Organic chemistryPolymer chemistryCopolymerPropylene oxidedegradationnanoparticleGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesMiniemulsionpolycarbonateChemical engineeringPolymerizationchemistryminiemulsion polymerizationCritical micelle concentrationPropylene carbonateCO20210 nano-technologyEthylene glycolPolymers
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Improvements in Rational Design Strategies of Inulin Derivative Polycation for siRNA Delivery.

2016

The advances of short interfering RNA (siRNA)-mediated therapy provide a powerful option for the treatment of many diseases, including cancer, by silencing the expression of targeted genes involved in the progression of the pathology. On this regard, a new pH-responsive polycation derived from inulin, Inulin-g-imidazole-g-diethylenetriamine (INU-IMI-DETA), was designed and employed to produce INU-IMI-DETA/siRNA "Inulin COmplex Nanoaggregates" (ICONs). The experimental results showed that INU-IMI-DETA exhibited strong cationic characteristics and high solubility in the pH range 3-5 and self-aggregation triggered by pH increase and physiological salt concentration. INU-IMI-DETA showed as well…

polycationssiRNA deliverySmall interfering RNAPolymers and PlasticsInulinBioengineering02 engineering and technology010402 general chemistry01 natural sciencesBiomaterialschemistry.chemical_compoundDrug Delivery SystemsMaterials ChemistryPolyaminesGene silencingHumansGene SilencingRNA Small Interferingpolycations siRNA delivery inulinRational designInulinBafilomycinRNATransfectionHydrogen-Ion Concentration021001 nanoscience & nanotechnologyEndolysosomePolyelectrolytesEndocytosis0104 chemical scienceschemistryBiochemistrySettore CHIM/09 - Farmaceutico Tecnologico ApplicativoDrug DesignMCF-7 Cellspolycations; siRNA delivery; inulin0210 nano-technologyBiomacromolecules
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Application of polydopamine functionalized zinc oxide for glucose biosensor design

2021

Zinc oxide (ZnO) nanostructures are widely used in optical sensors and biosensors. Functionalization of these nanostructures with polymers enables optical properties of ZnO to be tailored. Polydopamine (PDA) is a highly biocompatible polymer, which can be used as a versatile coating suitable for application in sensor and biosensor design. In this research, we have grown ZnO-based nanorods on the surface of ITO-modified glass-plated optically transparent electrodes (glass/ITO). Then the deposition of the PDA polymer layer on the surface of ZnO nanorods was performed from an aqueous PDA solution in such a way glass/ITO/ZnO-PDA structure was formed. The ZnO-PDA composite was characterized by S…

polydopamine (PDA)ITO modified glass electrodeMaterials sciencePolymers and PlasticsOrganic chemistrypolydopamine (PDA) ; ZnO-PDA nanocomposite ; photo-electrochemical glucose biosensor ; ITO modified glass electrodeengineering.materialArticleQD241-441CoatingGlucose oxidasechemistry.chemical_classificationbiologyGeneral ChemistryPolymerAmperometrychemistryChemical engineeringphoto-electrochemical glucose biosensorbiology.proteinengineeringSurface modificationZnO-PDA nanocompositeNanorodCyclic voltammetryBiosensor
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Metallocenes and post-metallocenes immobilized on ionic liquid-modified silica as catalysts for polymerization of ethylene

2014

Abstract The supported ionic liquid (SIL) strategy was used for the first time to metallocene and post-metallocene heterogeneous catalysts for olefin polymerization. The metal complexes: Cp2TiCl2, Cp2ZrCl2, FI–Ti, and Sal–Ti were immobilized in the 1-(3-triethoxysilyl)propyl-3-methylimidazolium alkylchloroaluminate ionic liquid, anchored on the surface of the mesoporous amorphous silica. The SIL systems were characterized by FTIR, 29Si NMR, N2 adsorption, EA, AAS, TG, and SEM techniques. The developed supported catalytic systems were found to be active in the ethylene polymerization and produce the polyethylene of various properties.

polyethyleneChemistryProcess Chemistry and TechnologyPost-metallocene catalystPolyethyleneCatalysischemistry.chemical_compoundAdsorptionPolymerizationsilicaIonic liquidPolymer chemistryorganometallic catalystCoordination polymerizationMesoporous materialMetalloceneionic liquidApplied Catalysis A : General : an International Journal Devoted to Catalytic Science and its Applications
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