6533b7dcfe1ef96bd1271eb9
RESEARCH PRODUCT
Phase separation of polymer blends in solution: A case study
Francesco Carfì PaviaVincenzo La CarrubbaG. A. MannellaValerio Brucatosubject
MorphologyMorphology (linguistics)Materials sciencePolymers and PlasticsPhase separationGeneral Physics and Astronomy02 engineering and technology010402 general chemistry01 natural scienceschemistry.chemical_compoundPhysics and Astronomy (all)Phase (matter)Materials ChemistryComposite materialchemistry.chemical_classificationCloud pointSettore ING-IND/24 - Principi Di Ingegneria ChimicaLactidePolymers and PlasticEquilibrium conditionsOrganic ChemistryPolymerPolymer blend021001 nanoscience & nanotechnology0104 chemical sciencesPolymer solutionSolventSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryChemical engineeringPolymer blend0210 nano-technologydescription
Abstract The phase behavior and phase separation features of the quaternary system poly- l -lactide (PLLA)/poly-rac-lactide (PLA)/dioxane/water were investigated. Experiments were performed with fixed total polymer concentration of 6 wt%, by varying the PLLA/PLA weight ratio. Blend weight compositions examined were 100/0, 80/20, 50/50, 20/80 and 0/100, at fixed dioxane/water weight ratio (87/13). Cloud point measurements reported that the demixing temperatures of blends are close to PLLA in the same mixed solvent, in line with the calculated spinodals. As regards to foam preparation, above the PLA cloud point, morphology is similar to pure PLLA foams; conversely, below PLA cloud point, the morphology resulted highly inhomogeneous. This behavior could be related to a change in equilibrium conditions occurring close to PLA cloud point. The equilibrium measurements performed gave out results in line with this hypothesis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-06-01 |