Papers by Keyword: Blend

Abstract: A series of poly(trimethylene terephthalate)/maleinized poly(octene-ethylene) copolymer blends are prepared and their melting, crystallization and dynamic mechanical propwerties were studied by using differential scanning calorimetry (DSC) and dynamic mechanical analyzer (DMA) respectively. The results suggest that the glass transition temperature of the blends shift to higher temperature because of the interaction between PTT and POE components. POE-MAH serves as a nucleating agent for the crystallization of PTT, and it increases the crystallizaiton rate of the blend and the start crystallizaiton temperature, but reduces the degree of crystallinity. Proper content of POE, e.g.1-2%, can improve the elastic modulus of the blend, but too much POE will depress the modulus.

Abstract: The blends of poly (trimethylene terephthalate)(PTT) and maleinized poly (octene-ethylene) copolymer (POE-MAH) were prepared by melt-blending method and their rheology and thermal stability were investigated by using rotational rheometer and thermalgravimetric analyzer (TGA) respectively. The rheological properties of PTT/POE-MAH blends demonstrate that all of the blends belong to the pseudoplastic fluid for their complex viscosity declines with the increasing shear rate. In addition, POE component can strengthen the melt viscosity, so the blend can be processed in the more wider temperature range. Moreover, the complex viscosity become more sensitive to the change of the shear rate, i.e., it decreases more apparently with the increase of the POE-MAH component. The melt flexibility increases apparently with the increase of the POE-g-MAH component. POE-MAH component only has a little depression on the thermal stability of the blends.

Abstract: In this article, the phase morphology and mechanical properties of poly (trimethylene terephthalate)/maleinized poly (octene-ethylene) copolymer blends are studied by using scanning electron microscopy (SEM), polarized optical microscopy (POM), universal material tester and charpy impact tester. The results suggest that the crystal size of the blends decreases obviously and POE component is partly served as nucleating agent for the crystallization of PTT. PTT and POE have good compatibility in blends because the dispersed phase of POE has even dispersion in blends when POE content is lower than 5%; however, the dispersion state of POE becomes poor when POE content is larger than 5%. The impact strength increases to maximum when the POE content is about 4 %. The tensile strength gets to maximum when POE content is 1-2 %.

Abstract: Through the graft copolymerization of LLDPE and the AA-MMA prepolymer by reactive extrusion on the single-screw extruder, the LLPE-g-AA-MMA was prepared and used as compatibilizer for starch/PE blends, and then the compatibilization effect was investigated. The results exhibited that the addition of this compatibilizer substantially improved the mechanical properties, especially the tensile strength. Scanning electron micrographs of the blend specimens also supported the above observations.

Abstract: Biodiesel is an alternative fuels for diesel engine with the blending process by chemically combination of vegetable or animal oil and diesel fuels. It is proved that the biodiesel can be used without any modification on the compression ignition (CI) engine. In this study, the cooking oil of namely carotene is used to produce the biodiesel blend fuels in various percentages. The biodiesel blend and diesel fuel are evaluated to analyze the engine performances in 4 cylinder inline CI engine. The characteristics of engine performances namely brake power output and brake specific fuel consumption are measured with various loads applied. The fuel properties of biodiesel blend are investigated namely density, dynamics viscosity and kinetic viscosity. The experimental results show that the performance of biodiesel B10 is better than it counterpart namely diesel in terms of brake power output and brake specific fuel consumption (BSFC).

Abstract: Blends of polycarbonate (PC) and highly branched polystyrene (HBPS) were prepared by melt blending. The steady rheological behavior of them was determined using a capillary rheometer, furthermore, the effect of shear rate, temperature and the blend component on the viscosity of the blends was discussed. The results showed that all the blends exhibit the nature of the pseudo-plastic fluids, and the viscosity of them decreases dramatically with the increase of temperature and does slightly with the increase of shear rate. At a fixed shear stress, the viscosity of the blends is decreased with the increase of the HBPS content. Microstructure studies using SEM showed that all the blends are characteristic of a two-phase morphology, with spherical droplets of the minor HBPS phase dispersed in the continuous PC phase.

Abstract: Pregelatinized and oxidized cassava starches were proven to be satisfactory to be distributed into poly(lactic acid) and poly(butylene adipate-co-terephthalate) mixture in order to obtain relatively inexpensive compostable material with acceptable properties. Thermoplastic starch from cassava appeared to effectively plasticize the mixture, particularly by pregelatinized starch which underwent complete granular destructuration. The destructuration allowed free hydroxyl groups in starch molecules to bind with free water and resulted in larger free volume which enhanced molecular mobility and, hence, the elongation. However, the destructuration of starch granule accelerated the dissolution of material in water and enhanced water sorption into the blend material.

Abstract: The magnesium slag is discarded from production of magnesium metal from dolomite. However the magnesium slag is slaked in some factories by means of sprinkling water to prevent from dust pollution. The possibility of slaked magnesium slag (SMS) to play a role of raw material and blend for portland cement was investigated by experiments of raw mix preparation, clinker calcining and property determination of cement pastes and mortars. The results revealed that SMS was still reactive. The raw mix with SMS was of excellent burnability that would contribute to energy saving. As a raw material, SMS can be used for calcining clinker of good quality; and as a blend it is suitable for production of ordinary portland cements. Because the magnesium slag is slaked, SMS has no problem on soundness. Higher strength of cement can be obtained in form of binary blends consisting of SMS and ground granulated blast-furnace slag or fly ash.

Abstract: The uniaxial time-dependent cyclic deformation of POM/PTFE blends was studied experimentally under the stress-controlled and strain-controlled loading. The volume fraction of PTFE in the POM/PTFE blends was 20%. It was shown that the creep behavior of POM/PTFE blends is better than that of POM. In the cyclic strain-controlled experiments, the responded stress amplitude has a close relationship with the applied strain amplitude and strain rate. As a result of stress relaxation, the responded stress amplitude decreases as the hold time at peak strain increases. Ratcheting occurs in the blends subjected to asymmetric stress-controlled cyclic loading, and the ratcheting strain depends on the applied stress amplitude and stress rate. Hold time at peak stress and low stress rate lead to an increased ratcheting strain. The POM/PTFE blends will fail as the hold time at peak stress is longer than a critical value.

Abstract: Biodegradable blend films of polylactide (PLA), thermoplastic starch (TPS), and poly(butylene adipate-co-terephthalate) (PBAT) were prepared through reactive modification. Three types of compatibilizers, methylenediphenyl diisocyanate (MDI), maleic anhydride (MA), and MA-g-PE, were studied. PLA and PBAT were blended in the presence of the compatibilizer to improve and evaluate the interfacial interaction. PBAT content was varied from 0 to 20 wt%, while compatibilizer content was differed from 0 to 5 wt% based on PBAT amount. For ternary blending, PLA, TPS, and PBAT were melt-blended with and without compatibilizer in a twin screw extruder using glycerol and tapioca starch as plasticizer and filler, respectively. The effects of type and content of compatibilizer and blend compositions on the physical, thermal, morphological, and tensile properties of the films were investigated. The results showed that the blend films with MDI had appropriate physical, thermal, and tensile properties. The presence of small amount of MDI enhanced the thermal and tensile properties of the films compared to the uncompatibilized films. This can be explained by a uniform morphology of the dispersed phase in the PLA matrix.