Capillary flow behavior of bicomponent polymer blends

Nishimura, Tetsuo

doi:10.1007/bf01438802

Cited by 12 publications

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“…The difference in information provided by these two types of measurements reflects on morphological differences of sheared blends. It is interesting that PS blends with high density polyethylenes, HDPE/PS behaved differently than those of LDPE/PS; the steady state viscosities (at constant shear stress) when plotted vs. concentration showed a sigmoidal dependence with the positive deviation for HDPE-rich blends (1 7, [19][20][21]. The magnitude of the negative deviation from the log-additivity decreased with increase of u12.…”

Section: Rheological Evaluation O F Polystyrene/polyethylene Blendsmentioning

confidence: 99%

Rheological evaluation of polystyrene/polyethylene blends

Utracki

Sammut

1988

Polymer Engineering & Sci

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The dynamic shear behavior at 2 O O O C of low density polyethylene, LDPE, polystyrene, PS, and their blends was studied. Two series of blends were prepared containing LDPE:PS = 1:2, 2:l and 17:3; the first series contained 0, the second 5 wt% of the compatibilizing, partially hydrogenated poly(styrene-b-isoprene) di-block copolymer, SEB. From the Casson plot the relative values of apparent yield stress were found to be G I > GZ; the addition of SEB decreased both these functions, but the inequality remained valid. After subtracting the yield stress values the frequency relaxation spectrum was computed from the relation G" = G"(w). The linear viscoelastic functions determined from the spectrum were found to agree with experimental values within a range of error below 5%. The blends were found to be thermorheologically complex with the time-temperature shift factors depending on both temperature and frequency. A compositional dissymmetry of blend morphology was observed: PS dispersed in LDPE formed spheres, while at corresponding concentration LDPE in PS formed fibers. A difference in surface tension of the two polymers, leading to different spreading coefficients (SpE/ps # SPS/PE). or dissymmetry of the interfacial tension coefficient, could provide a possible explanation.

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Section: Rheological Evaluation O F Polystyrene/polyethylene Blendsmentioning

confidence: 99%

Rheological evaluation of polystyrene/polyethylene blends

Utracki

Sammut

1988

Polymer Engineering & Sci

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“…Dada la dificultad para estimar ∆G m , se han planteado diferentes modelos que permiten llevar a cabo una aproximación. Así pues, el término de la entalpía presenta una dependencia cuadrática con la composición y el término entrópico se estima a partir de la contribución combinatoria a partir de un modelo de red para la mezcla ( [19] Paul and Barlow, 1980 …”

Section: 11unclassified

Influencia de la viscosidad en la incompatibilidad de mezclas de residuos de materiales plásticos en el proceso de reciclado

Vidal¹

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Rheological properties of polypropylene/high‐density polyethylene blend melts. I. Capillary flow properties

Fujiyama

Kawasaki

1991

J of Applied Polymer Sci

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SYNOPSISThree kinds of isotactic polypropylenes ( PP ) with different melt flow indexes ( MFIs) were melt-blended with three kinds of high-density polyethylenes (HDPE) with different MFI using a screw extruder, and the morphologies and capillary flow properties such as flow curve, entrance effect, Barus effect, and melt fracture were studied. When HDPE contents were 70 wt % or above and PP particles formed the disperse phase, the size of the particles decreased with decreasing viscosity of PP. When HDPE contents were 30 wt % or below and HDPE particles formed the disperse phase, the size of the particles was minimum when the viscosities of PP and HDPE were similar. The die swell ratios of the blends were higher than those of the components. On the other hand, the entrance correction coefficients of the blends were intermediate between those of the components. There was no correlation between the die swell ratio and the entrance correction coefficient. Therefore, it is not always appropriate to regard the entrance correction coefficient as a measure of melt elasticity in the case of inhomogeneous polymer systems such as PP/HDPE blend. I NTRO DUCT10 NBlends of isotactic polypropylene (PP) and highdensity polyethylene ( HDPE) are industrially widely used for the purpose of improving the impact strength and processability of PP and improving the environmental stress cracking resistance and processability of HDPE. Many studies have so far been done on the rheological properties of PP/HDPE blends.'-17 They include flow curve, 1-6,899~13~16~17 die swell, 7,11,15-17 melt fracture, ',16 recoverable shear strain, '314 normal stress, 13,14 stress-optical coefficient, l3 relaxation time, l4 relaxation spectrum, dynamic viscoelasticity, l2 and morphology formation."The present article concerns systematic studies on morphologies and the capillary flow properties such as flow curve, entrance effect, Barus effect, and melt fracture for the blends composed of the combination of three kinds of PPs with different melt flow indexes (MFIs) and three kinds of HDPEs with * To whom correspondence should be addressed.Journal of Applied Polymer Science, Vol. 42, 467-480 (1991) CCC 0021-8995/91/020467-14$04.00 different MFI. In the following article, the dynamic viscoelastic properties will be reported. EXPERIMENTAL SamplesThe characteristics of the raw resins used in this experiment are shown in Table I. MFI was measured using a counter method at 230°C under a load of 2160 g according to the ASTM D 1238-861' and was converted on PP volume. Molecular weights were measured at 135OC with a gel permeation chromatograph GPC 150-C manufactured by Waters Ltd. The column system used was lo3, lo4, lo5, lo6, and lo7 A and solvent used was o-dichlorobenzene. The last letters H, M, and L in the sample code indicate high, medium, and low MFI. PPH, PPM, PPL, PEH, and PEM have similar molecular weight distributions and PEL has a very broad distribution.For the combination of PPM and three PEs and the combination of PEM and three PPs, both componen...

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Capillary flow behavior of bicomponent polymer blends

Cited by 12 publications

References 12 publications

Rheological evaluation of polystyrene/polyethylene blends

Rheological evaluation of polystyrene/polyethylene blends

Influencia de la viscosidad en la incompatibilidad de mezclas de residuos de materiales plásticos en el proceso de reciclado

Rheological properties of polypropylene/high‐density polyethylene blend melts. I. Capillary flow properties

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