Viscosity vs. composition

Since the homologous polymer blends are known to be miscible It Is not surprising that mixtures of HDR with HDR or IDK with U>BE are miscible as well (12, 13). However, due to the diversity of polymerization methods and the variety of resulting molecular characteristics LLDra/LLDra systems are not always miscible (10, 14-15). In our laboratory three series of blends were prepared by Identical procedure of mixing the same LLDPE with two other LLDPE resins and with LDPE. The zero-shear viscosity vs. composition dependence, n vs. W2, of these systems Is presented In Fig. 1. Only the LLDPE s prepared with the same Tl-catalyst were found to be miscible (curve 2). Neither blend of LLDPE with LDPE (curve 3) nor LLDPE prepared with a vanadium catalyst LLDPE (curve 1) were miscible. There are Indications In the literature (8) that... 

Table 6.66 Isopropyl Alcohol-Water Kinematic Viscosity vs Composition at 25 C (19)...

Figure 4. Viscosity vs. composition at 298°K and 1 bar for various binary alkane mixtures. Data are from Chevalier et at. [41].

Fig. 25 Surface shear viscosity vs. film composition for the palmitic acid/stearoylserine methyl ester film system at 25°C.

Fig. 56. Dependence of Mwof the microgels on the polymer yield in the anionic polymerization of EDMA in toluene by n-BuLi [254] (see Figure 53 caption for the reaction conditions). Reduced viscosity vs concentration of microgels a) Composition (mol %) N,N -methyl-enebisacrylamide (55%), methacrylamide (33%), methacrylic acid (2%), methacrylamido acetaldehyd-dimethylacetal (10%),measured at 20 °C in water, b) Composition (mol %) 1,4-DVB (35%), propenic acid amide-2-methyl-N-(4-methyl-2-butyl-l,3-dioxolane prepared by emulsion copolymerization and measured in dimethylformamide.

Holden et al. (47) first noted the peculiar characteristics in the steady shear behavior of the SBS block copolymer melts. For a certain composition of styrene and butadiene, no limiting Newtonian viscosity was found at low shear rates. For some of the others, there exist two distinct viscosity vs. shear rate relationships (Figure 10). Arnold and Meier (73) carried out the experiments in oscillatory shear and found the same... 

Figure 8. A semi-logarithmic plot of viscosity vs. time for the sulfur—DCP solutions at 140°C for the composition of DCP mole fraction, X = 0-50%...

Figure 11. A plot of the rate of increase of logarithmic viscosity vs. the feed composition in mole fractions of DCP at 140° C...

Figure 12. A double-logarithmic plot of the rate of increase of logarithmic viscosity vs. the feed composition in mole fractions of DCP (----------------------) at 140°C and (---) at 155°C...

Melt Viscosity Equation of Sulfui>-DCP Solutions. An assumption is made that the sulfur-DCP solution is a Newtonian fluid, i.e., the viscosity measured by the Brookfield viscometer is independent of the spindle speed, which is related to shear rate. The linear plots of log (viscosity) vs. time as in Figures 8, 9, and 10 give the following equation for a given sulfur-DCP composition at a given temperature ... 

Given in the literature are vapor pressure data for acetaldehyde and its aqueous solutions (1—3) vapor—liquid equilibria data for acetaldehyde—ethylene oxide [75-21-8] (1), acetaldehyde—methanol [67-56-1] (4), sulfur dioxide [7446-09-5]— acetaldehyde—water (5), acetaldehyde—water—methanol (6) the azeotropes of acetaldehyde—butane [106-97-8] and acetaldehyde—ethyl ether (7) solubility data for acetaldehyde—water—methane [74-82-8] (8), acetaldehyde—methane (9) densities and refractive indexes of acetaldehyde for temperatures 0—20°C (2) compressibility and viscosity at high pressure (10) thermodynamic data (11—13) pressure—enthalpy diagram for acetaldehyde (14) specific gravities of acetaldehyde—paraldehyde and acetaldehyde—acetaldol mixtures at 20/20°C vs composition (7) boiling point vs composition of acetaldehyde—water at 101.3 kPa (1 atm) and integral heat of solution of acetaldehyde in water at 11°C (7). 

In miscible systems the category of In n vs. relation depends on the free volume variation with composition, f = f(w). For non-Interacting, homologous liquids (for example fractions of a given polymer), this relation can be computed from statistical thermodynamics and variations of viscosity with composition have been predicted with good precision (39). In that case only a small PDB was observed. 

Fig, 1, Dynamic viscosity of 10 wt,% blend solution vs. composition of PVC-polymethacrylate blends 1-PMMA 2-PBMA ... 

The peak in the plot of viscosity vs. surfactant concentration in general occurs in the vicinity of the CAC. Here, the composition of the mixed HM-polymer-surfactant micelles changes strongly with concentration to become dominated by the surfactant thus, the cross-linking effect is lost. 

The intrinsic viscosities were determined by dilution at constant polymer-NaDS complex composition. The hydrodynamic volume of the polymer is increasing with the NaDS-content of the complex. In 0.1 M NaN03 solution a minimum appears in the intrinsic viscosity vs. complex composition curves for the poly-(vinyl-pirrolidone)-NaDS and poly-(vinyl-alcohol vinyl-acetate) copolymer-NaDS system. 

Figure 25 Viscosity vs. time at the skin and at the core for two glass fiber/polyester composites with different thickness cured in a mold at 60°C. (Ato Kenny at al., ref...

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