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A modified polyamide 6 has been used as compatibilizer in blends of polyamide (PA) and isotactic polypropylene (PP). PA was modified in the molten state by trimellitic acid (TMA) and n-octyl glycidyl ether by reactive processing. NMR and FTIR results show that TMA and the ether reacted with PA. Isothermal crystallization kinetics of the polymers in neat and blend states has been investigated by differential...
Copolymers of methyl methacrylate (MMA) with 2-hydroxyethyl methacrylate (HEMA) and 4-methacryloxyethyl trimellitic anhydride (4META) were synthesized. The miscibility regions, for blends of these copolymers with styrene-acrylonitrile (SAN) copolymers were determined. The miscibility region for MMA-HEMA copolymers is larger than that for MMA-4META copolymers. Interaction energies for monomer unit...
The fracture of blends of nylon 6 and maleated ethylene–propylene rubber was examined by both the Izod impact test and a single-edge notch three-point bend (SEN3PB) instrumented Dynatup test. The effects of EPR-g-MA content, ligament length, method of fracture surface measurement, sample thickness and fracture position in the molded bar on the fracture behavior were investigated. The data were analyzed...
The thermal behavior of blends of poly(vinylidene fluoride), or PVDF, and poly(o-methoxyaniline) doped with toluene sulfonic acid was studied by thermogravimetic analysis, electrical conductivity measurements, differential scanning calorimetry, X-ray diffraction and scanning electron microscopy. Blends with thermal and electrical conductivity stabler than the conductive polymer alone were obtained...
This paper reports the synthesis and characterization of a sulfonated polymer based on hydrogenated poly(styrene–butadiene) block copolymer (HPBS). Block copolymer ionomers were prepared through sulfonation of part of the polystyrene blocks. The free acid samples (HPBS–SH), and their blends with the non-sulfonated polymer (HPBS) and polypropylene (PP) were studied. FTIR was used to confirm sulfonation...
Blends of syndiotactic polystyrene (SPS) with polyphenylene ether (PPE) have been prepared to determine the effect of blending on the crystallisation mechanism of SPS. The miscibility of the blend was confirmed by both differential scanning calorimetry and dynamic mechanical thermal analysis. Crystallisation of the blends was studied under isothermal and non-isothermal conditions using differential...
Melt rheology, phase morphology and properties of (30/70) isotactic polypropylene/ethylene-co-propylene (iPP/EPR) blends, containing EPR copolymer synthesised by means of a titanium based catalyst with very high stereospecific activity (EPRTi), were compared to that of (30/70) iPP/EPR blends containing EPR copolymer synthesised by using a traditional vanadium based catalyst (EPRV). It was found that...
Blends of polypropylene and two polyketone grades with low and medium-high viscosities were prepared by melt extrusion. To obtain good compatibility, a maleic-anhydride–polypropylene copolymer was added to the blends. Polyoxypropylenediamine was added to some of the blends to further enhance compatibility. The blends were analysed with differential scanning calorimetry. In a second step, the blends...
DSC and optical microscopy were used to determine the miscibility and crystallinity of blends of poly(ethylene oxide) (PEO) with poly(methyl vinyl ether-co-maleic acid) (PMVE-MAc). Single T g was observed for all blends, indicating miscibility. The dependence of T g on the weight per cent of PEO presents a negative deviation from linearity at high PEO content, associated to a greater...
The lamellar morphology of a melt-miscible blend consisting of two crystalline constituents, poly(vinylidene fluoride) (PVDF) and poly(3-hydroxybutyrate) (PHB), has been investigated by small angle X-ray scattering (SAXS). Owing to the proximity of melting points, PVDF and PHB crystallized over essentially the same temperature range, and consequently created a crystalline/crystalline state with the...
The enhanced crystallisation behaviour exhibited by branched polyethylene (BPE) when blended with a commercial linear polyethylene (LPE) was studied. Two commercially available BPE were examined, one was a low-density polyethylene type and the other a 1-octene copolymer produced by Dow using its constrained geometry catalysts technology. Low LPE content blends were investigated. Enhanced crystallisation...
Benzoxazine resins and poly(ε-caprolactone) (PCL) are melt blended and the properties of the blends in the range of 0–15wt.% of PCL are studied by dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). The Tgs of the benzoxazine blends in the presence of PCL are found to be slightly lower than that of neat polybenzoxazine resin. The blends show improved mechanical properties, including...
A number of dry melt-mixed binary blends of 32mol% ethylene vinyl–alcohol copolymer (EVOH) and an amorphous polyamide (PA) and a crystalline Nylon-containing ionomer have been characterized in terms of phase morphology, crystallinity and mechanical properties by DSC, WAXS, DMA, SEM, microhardness (MH) and tensile testing. Such blends are claimed by manufacturers to improve the thermoformability characteristics...
A hot-tool welding machine was used to study the hot-tool weldability of several commercial thermoplastic blends: a blend, ABS, of acrylonitrile–butadiene–styrene; a blend, PC/ABS, of polycarbonate (PC) and ABS; a blend, PC/PBT, of PC and poly(butylene terephthalate) (PBT); a blend, M-PPO, of poly(phenylene oxide) (PPO) and HIPS; a blend, PPO/PA, of PPO and polyamide 6,6; 30GF-MPPO, a 30wt% glass-filled...
Binary blends of ethylene–styrene copolymers were studied over the full range of copolymer styrene content. A miscibility and cocrystallization map was determined from morphology as imaged with atomic force microscopy (AFM), glass transition behavior primarily from dynamic mechanical thermal analysis (DMTA), and melting behavior from differential scanning calorimetry (DSC). A difference in styrene...
The thermal properties of amorphous and melt crystallized poly(ethylene-2,6-naphthalene dicarboxylate) (PEN) and its blends with poly(ethylene terephthalate) (PET) were investigated. Temperature modulated DSC (TMDSC) was used over a broad range of annealing times and temperatures. PEN under all moderate temperature crystallization conditions was found to exhibit secondary crystal melting in the low...
Blends of nylon 6 with maleated ethylene–propylene rubber (EPR-g-MA) were prepared by melt blending over the whole composition range. The reaction of the polyamide amine end groups with the grafted maleic anhydride has the potential to form thermoplastic elastomers (TPE) with controlled morphology and chemical bonding between the phases. This study focuses on the effects of nylon 6 content and crystallinity...
Rodrun 5000/Vectra B950 blends were obtained by direct injection moulding at two injections rates. The blends were partially miscible and unreacted under the processing conditions used. Higher orientations and properties were obtained at the lower injection rate due to the higher overall orientation obtained. The produced orientation and the negative volume of mixing of the blends led to a range of...
Blends of poly(ethylene oxide) and hydroxypropyl methylcellulose in the form of free films are examined for evidence of specific polymer:polymer interactions. Such interactions might affect the drug release behaviour of compressed matrices incorporating these polymers. The effect of HPMC on the crystallisation of PEO during casting is investigated using differential scanning calorimetry (DSC) and...
Morphology and rheology of the blends of two commercial polypropylene (PP) grades (designated as MA3 and MM1) with a commercial modifier (EP1) based on hydrogenated oligo (cyclopentadiene) (HOCP) were studied using modulated differential scanning calorimetry (MDSC) and dynamic shear rheometry. Melting and crystallisation points as well as glass-transition temperatures were determined and correlated...
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