Search results for "BLENDS"

showing 7 items of 67 documents

Clay nanocomposites based on compatibilized PA6/HDPE blends

2009

Settore ING-IND/22 - Scienza E Tecnologia Dei Materialinanocomposites organoclay polyethylene polyamide compatibilized blends
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A new method to valued efficiency of enzyme blends for pancreas tissue digestion

2009

One of the best successful examples of cell therapy is represented by islet transplantation since 1990. However islet isolation methods are not completely standardized yet. More than half of isolation procedures failed to isolate adequate islets for transplantation, due to variable pancreas conditions and to unpredictable enzymatic blend efficiency. Enzymes used for pancreas digestion include collagenases and neutral proteases: their composition and activity are largely variable between different batches. We set up a new in vitro method to better in vitro characterize enzymatic blend before its use in human pancreas. In our experimental approach human immortalized cells (ECV-304) or human is…

enzyme blends pancreas tissue digestion
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Nanofilled Thermoplastic-Thermoplastic Polymer Blends

2014

Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiPolymer blends nanocomposites
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Degradation Behavior of Nanocomposite Polymer Blends

2014

The usefulness of any material, including nanocomposite polymer blends, depends on its degradability and durability. Thus, this chapter reviews the status of the research on degradation of nanocomposite polymer blends and, in particular, on clay-nanocomposite polymer blends, paying particular attention to both the role of the filler and the role of the blend morphology and composition. The results of recent research indicate that the clay has two opposing effects on the thermal stability of a nanocomposite polymer blend: (1) a promoter effect of the polymer matrix degradation, which decreases the thermal stability, and (2) a barrier effect, which improves the thermal stability. Moreover, th…

chemistry.chemical_classificationFiller (packaging)NanocompositeMaterials scienceNanocomposites polymer blends degradationPolymerSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiPolymer degradationchemistryDegradation (geology)Thermal stabilityPolymer blendComposite materialPhotodegradation
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Modification of EVOH copolymers with e-caprolactone: synthesis and compatibilization effects in PE/PVC blends

2001

Polyethylene-polycaprolactone graft copolymers with different chemical structures (i.e. different number and length of PCL grafts and molecular weight of PE backbone) were synthesized from various EVOH copolymers and e-caprolactone, using Aluminum isopropoxide as catalyst, and were tested for their compatibilizing capability in PE/PVC blends. PE and PCL segments in the graft copolymers were found completely immiscible, while PCL segments of the graft copolymers were found completely miscible with PVC. When graft copolymers were added to PE/PVC blends they proved to be good agents for the dispersion of PVC phase in the PE matrix. SEM showed also improved adhesion between the dispersed PVC ph…

POLYETHYLENEMaterials sciencePolymers and PlasticscompatibilizationOrganic ChemistryINCOMPATIBLE POLYMERSConcentration effectCompatibilizationPolyethyleneCondensed Matter PhysicsGraftingchemistry.chemical_compoundPolyvinyl chloridecompatibilization; polymer blends; ethylene-co-vinyl alcoholBLOCK-COPOLYMERSPOLYMER BLENDSSettore ING-IND/22 - Scienza E Tecnologia Dei Materialichemistryethylene-co-vinyl alcoholMaterials ChemistryCopolymerPolymer blendComposite materialCaprolactonepolymer blends
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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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Tissue engineered vascular grafts based on poly-lactic acid blends

2013

A great deal of research has been pursued in the last decade with the goal of developing blood vessel substitutes. Tissue engineering has emerged as a promising approach to address the shortcomings of current options. One of the major tasks in this research field is the possibility to tune the biodegradability of the implantable devices (scaffolds). After implantation, the scaffold has to be replaced by extra cellular matrix; with this respect, it is crucial that this replacement takes place with appropriate dynamics and a well-defined timescale. In this work tissue-engineered vascular graft were produced, utilizing several PLLA/PLA blends (100/0, 90/10, 75/25 wt/wt) in order to tune their …

ScaffoldPolymer BlendsVascular Tissue Engineering
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