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Morphological reorganization and mechanical enhancement in multilayered polyethylene/polypropylene films by layer multiplication or mild annealing
- Publication Year :
- 2018
-
Abstract
- Shortly after processing, Polyethylene/Polypropylene (PE/PP) multilayer films demonstrate an increase in tensile modulus and other mechanical properties when the individual layer thickness is below 0.5 μm. Subsequent annealing at 60 °C for 16 h brings the properties of all other samples to similar values. WAXD characterization of the layered films identified a prevalence of mesophase in the thicker PP layers. In samples with increased layer numerosity or subjected to annealing, WAXD detected its conversion to α crystalline phase that correlates with improved mechanical properties. SSNMR and DSC detailed the defective nature of α iPP crystallites. Comonomers, detected by NMR in the commercial polymers used for the films, are the source of "tunable disorder" that dictates the formation of the PP mesophase and the low temperature of conversion to the mechanically stronger defective α phase. Soft intrafilm layer interfaces instead enable nucleation and localized polymer chain rearrangement even without annealing
- Subjects :
- mesophase
Nanostructure
Materials science
Polymers and Plastics
Annealing (metallurgy)
polymer
Condensed Matter Physic
02 engineering and technology
010402 general chemistry
01 natural sciences
chemistry.chemical_compound
NMR spectroscopy
Materials Chemistry
mechanical propertie
Physical and Theoretical Chemistry
Composite material
Polypropylene
Polymers and Plastic
X-ray Diffraction
Multilayer film
Polyethylene
021001 nanoscience & nanotechnology
Condensed Matter Physics
polypropylene mesophase
0104 chemical sciences
Polypropylene crystallinity
chemistry
confinement
Polymer processing
0210 nano-technology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c12a9908c08e31162f6763511e2ea0fd