The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The thermal behaviour of poly(acryloyloxybenzoic acid) (PABA)/nylon 6 (PA6) blends were investigated by differential scanning calorimetry. Melting point (T m ) of PA6 depressed with increasing PABA content. When PABA content was larger than about 60wt%, second endotherm was observed above the T m (first endotherm). Wide angle X-ray diffraction analysis suggested that crystallinity...
The phase behaviour of an oligomer mixture of polystyrene/poly(methyl methacrylate) (PS/PMMA), which shows an upper critical solution temperature (UCST) type phase diagram, has been investigated under simple shear flow. The cloud points were strongly affected by the values of the applied shear rate. The phase diagrams under different values of shear rate, indicated shear-induced mixing for all measured...
Morphology of reactively compatibilzed polymer blends was discussed in terms of particle asphericity (ζ)-size (a) map. Reactive melt blending of polysulfone (PSU) with polyamide 6 (PA) was carried out at 20/80 (PSU-PA) wt ratio by adding a few wt% of reactive PSUs; maleic anhydride-grafted PSU (PSU-MAH) or phthalic anhydride-terminated PSU (PSU-PhAH). Morphology development was investigated by light...
Reactive melt blending of polyamide 6 (PA) and polysulfone (PSU) was carried out and the effect of the copolymer architecture on the pull-out of the copolymer in situ-formed during reactive blending was studied. To create various block and graft copolymers by reactive blending, three types of reactive PSU were prepared and used; maleic anhydride-grafted PSU, carboxylic-grafted PSU, and phathalic anhydride-terminated...
Reactive blending of dissimilar polymers involves in situ reactions of functionalized components to form a block or graft copolymer at the interface between phases. The copolymer is believed to play a role of the emulsifier to prevent particle coalescence and to improve interfacial adhesion. A mixture of non-reactive polysulfone (PSU) and small amount of reactive PSU, phthalic anhydride-terminated...
Elongational flow behaviour of a poly(styrene-co-acrylonitrile) (SAN)/poly(methyl methacrylate) (PMMA) blend of a near critical composition (∼40/60) was examined below and above its lower critical solution temperature Ts(=195°C) via elongational flow opto-rheometry (EFOR) which enabled us to simultaneously monitor transient tensile stress σ(ε̇0;t) and birefringence Δn(ε̇0;t) as a function of time...
Reactive melt blending of polyamide 6 (PA) and polysulfone (PSU) was carried out and the interfacial behavior of in situ-formed block copolymer was studied. A series of reactive PSUs with different functional groups at chain ends were prepared and used; PSU-epoxy, -triazine and -phthalic anhydride. The morphology development during melt blending was investigated by light scattering and transmission...
By reactive blending of polyamide 6 (PA) with polysulfone (PSU) using a gram-scale mixer (Mini–Max Molder), we prepared a series of PA/PSU (80/20wt. ratio) blends with various diameters of PSU particles; 70nm by using phthalic anhydride-terminated PSU (PSU-PhAH), 0.4μm by epoxy-terminated PSU, 0.45μm by maleic anhydride-grafted PSU and 1.3μm by non-reactive PSU. By light scattering (LS), small-angle...
Reactive blending of polysulfone (PSU) and polyamide 6 (PA) was carried out at 20/80 weight ratio using a gram-scale mixer at 260 o C. Maleic anhydride-grafted PSU (PSU-MAH) and phthalic anhydride-terminated PSU (PSU-PhAH), having almost same molecular weight (M w ~20k) and functional group content (ca. 90μmol/g) were prepared and used. The particle size reduction process was investigated...
Aliphatic polyamide (PA 6 or PA 66), polysulfone (PSU) and polysulfone copolymerized with 4,4′-bis(4-hydroxyphenyl)pentanoic acid bearing carboxylic acid functions (PSU copolymers) were melt blended in the MINI-MAX moulder. Morphology of the blends was characterized by image analysis on SEM pictures and light scattering. The particle size depends on the viscosity ratio and on the concentration of...
The interfacial thickness in reactively compatibilized polymer blends is analysed with ellipsometry for the blend system polyamide 12/(polystyrene/poly(styrene-co-maleic anhydride)) PA-12/(PS/SMA2) and the blend system PA-12/SMA for different SMA types. Bilayer specimens were prepared and the interfacial thickness was measured in situ during annealing in the melt. SMA2 is expected to react with the...
The stress-birefringence relationship was examined for amorphous poly(ethylene terephthalate) films under uniaxial stretching in the temperature range 80–95°C at various stretch speeds in order to study the effect of strain-induced crystallization. At high temperatures, the ordinary stress-optical rule (SOR) held well at low draw ratios; the birefringence was proportional to the stress. However, at...
The behaviour of thin films of symmetric block copolymers of styrene and methyl methacrylate in contact with other polymers or with air is studied by transmission electron microscopy. The characteristic layer formation of the block copolymer in contact with vacuum or with a different, completely immiscible polymer can be observed. If one of the blocks is miscible with a contacting polymer, competitive...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.