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Nanophase separation during injection molding of high density polyethylene (HDPE) together with polyethylene reactor blend (RB) additives that have ultrabroad bimodal molar mass distribution and a high content of ultrahigh molar mass polyethylene (UHMWPE), produces thermoplastic all-polyethylene composites reinforced with extended-chain UHMWPE nanostructures formed in situ. Neither alien fibers, inorganic...
Systematic variation of copolymers (Poly (ethylene-covinylacetate)) composition provide an opportunity to change matrix polarities and thus explore their effects on the polymer/filler interactions and composite properties. The main objective of this work is to study the effect of vinyl acetate (VA) content on the extent of exfoliation and dispersion of thermally reduced graphite oxide (TrGO), as well...
Novel families of elastomeric polyurethane (PU) nanocomposites are prepared by in-situ polymerization of diisocyanate with functionalized graphene nanosheets dispersions in polyether polyols. The influences of graphene dispersion, interfacial coupling and PU hard segment content on PU nanocomposite morphologies, mechanical and electrical properties are investigated. High shear mechanical dispensing...
Hyperbranched amphiphilic polymeric systems with core–shell architecture can be used as versatile nanocontainers and templates with great potential in application fields ranging from medicine to organic coatings. In order to explore an alternative to the already widely used and established synthetic macromolecules, we synthesized new polymers based on hyperbranched polylysine. Polylysine was prepared...
Mesostructurally ordered inorganic–organic hybrid composite materials were successfully synthesized by utilizing a low-molecular-weight amphiphilic polyethylene-block-poly(ethylene oxide) (PE–PEO) diblock copolymer as the directing agent. The hybrid composites were formed via the sol–gel reaction of inorganic precursor tetraethoxysilane (TEOS) in an acidic ethanol/water solution with various amounts...
When polymers are crystallized at large supercoolings a subsequent heating is accompanied by recrystallization processes, which proceed to a fixed final melting point. We studied these processes with small-angle X-ray scattering and DSC measurements for three s-polypropylenes with different stereoregularities and co-unit contents. As is known from previous experiments, crystal thicknesses d c...
Polymer blends consisting of linear poly(l-lactide) (PLLA) and different proportions of dendritic PLLA-based copolyesters (hb-PLLA) characterized by different degrees of branching (DB) were obtained in melt. The solid-state properties of poly(l-lactide)s and their blends were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), atomic force microscopy (AFM) and...
Novel reactive core/shell-type hyperbranched blockcopolyethers were tailored as new class of liquid rubbers useful as flexibilizers and toughening agents of anhydride-cured epoxy resins. Anionic ring-opening polymerization of glycidol onto a six-arm star poly(propylene oxide-block-ethylene oxide) afforded hyperbranched polyether cores as macroinitiators for propylene oxide graft copolymerization....
Syndiotactic polypropylene (sPP) compounds containing organophilic layered silicates were prepared by means of melt extrusion at 220 o C using a corotating twin screw extruder in order to examine the influence of the silicate modification and the addition of maleic-anhydride-grafted isotactic polypropylene (iPP-g-MA) as compatibilizer on morphology development and mechanical properties. Synthetic...
Thermoset/thermoplastic elastomer (TPE) blends of poly(propylene glycol) (PPG)-type epoxy resin (ER) and a diblock copolymer, polystyrene-b-polybutadiene (SB, with 30% styrene content), were prepared using 4,4'-diaminodiphenylmethane (DDM) as curing agent. The miscibility and thermal transition behavior of DDM-cured ER/SB blends were investigated by differential scanning calorimetry (DSC) and dynamic...
The crystallisation behaviour of syndiotactic poly(propene-co-octene) (P-co-O)-X with octene contents, X, of 4, 15, 20, 40, and 67 wt% is studied by light microscopy, atomic force microscopy (AFM), small angle X-ray scattering (SAXS), wide angle X-ray scattering (WAXS) and differential scanning calorimetry (d.s.c.) The decrease of equilibrium melting points with increasing octene content is in agreement...
Blends of isotactic and syndiotactic polypropylene were studied by differential scanning calorimetry (d.s.c.), light transmission measurements and pressure-volume-temperature (PVT) measurements. D.s.c. measurements show the absence of any kind of melting point depression in the blends. Furthermore, the change of the ratio of crystallized i-PP and crystallized s-PP in the blends as a function of crystallization...
Blends of isotactic and syndiotactic polypropylene were studied by wide angle X-ray scattering (WAXS), small angle X-ray scattering (SAXS), light microscopy, scanning electron microscopy and atomic force microscopy. WAXS measurements show that both polymers crystallize in different unit cells already during precipitation from a common solvent. Both polymers have a very similar long period and lamella...
The morphology of syndiotactic polypropylene (s-PP), containing 91% racemic pentads, isothermally crystallized from the melt has been investigated by means of light microscopy, atomic force microscopy (AFM), and small-angle X-ray scattering (SAXS). Light microscopy shows a typical needle-like structure of crystalline entities at crystallization temperatures ranging from 115 to 150°C. Large bundles...
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