Viscosity molecular weight

Volume Rate, Actual m /s Molecular Weight Viscosity, mPa-s Pressure, kPa (bar a) Temperature, °C Design Range, % of Normal... 

N umerical simulations of reactor start-up were programmed, predicting monomer and initiator concentrations, total polymer concentration, weight and number average molecular weights, viscosity and population density distribution dynamics. The following two relationships obtained from steady state observations were utilized in the simulation. 

Borman, W. F. H., Molecular weight-viscosity relationships for polybutylene terephthalate,./. Appl. Polym. Sci., 22, 2119-2126 (1978). 

Structural properties such as molecular weight, viscosity, plasticity and crystallinity are important tools to evaluate ... 

The lower the rate of pyridine association to the Py/P4VP template the higher the molecular weight (viscosity) of polymer formed. The molecular weight and amount of... 

Monomer Type of Main Chain Functionality Abbreviation Molecular Weight Viscosity, mPa.s at 25°C... 

Amidoamine or polyamidoamine curing agents have reactivity with DGEBA epoxy resins that is similar to the polyamides. However, they are lower-viscosity products and are also lower in color. Amidoamines are derivatives of monobasic fatty carboxylic acids and aliphatic polyamines. Since the amidoamines have only one amide group per molecule, they are lower in molecular weight, viscosity, and amine functionality than the polyamides. 

F 2 Fee, J. G., W. S. Port and L. P. Witnauer Molecular weight viscosity relationship of gamma-irradiated octadecyl vinyl ether and octadecyl methacrylate. J. Polymer Sci. 33, 95 (1958). 

Fig. 9. Rotational relaxation time as a function of molecular weight (viscosity average) for fluorescein conjugates of polyacrylamide in dilute aqueous solutions. Filled circle represents the value of for free dye (recalculated from Fig. 5 of ref. 11, using the directly measured lifetime t)...

Polyvinylpyrrolidone (PVP) 2-8 Available in range of molecular weight/ viscosities soluble in water and ethanol... 

Economic Objectives. Yp Throughput Conversion Yield Selectivity Composition Molecular weight Viscosity... 

Macromolecular Gel permeation Molecular weight Viscosity, toughness... 

Viscosity measurements alone cannot be directly used in the Mark-Houwink-Sakurada equation to relate absolute viscosity and polymer molecular weight, since additional unknowns, K and a must be determined. Therefore, viscometry does not yield absolute molecular weight values it rather gives only a relative measure of polymer s molecular weight. Viscosity measurements based on the principle of mechanical shearing are also employed, most commonly with concentrated polymer solutions or undiluted polymer these methods, however, are more applicable to flow properties of polymers, not molecular weight determinations. 

Viscosity molecular weight Viscosity molecular weight Viscosity molecular weight... 

Type of PEG (nominal average molecular weight) Viscosity (kinematic) [mmVs (cSl)]... 

The GPC-viscometry with universal calibration provides the unique opportunity to measure the intrinsic viscosity as a function of molecular weight (viscosity law, log [17] (it versus log M) across the polymer distribution (curves 3 and 4 in Fig. 1). This dependence is an important source of information about the macromolecule architecture and conformations in a dilute solution. Thus, the Mark-Houwink equation usually describes this law for linear polymers log[i7] = ogK+ a log M (see the entry Mark-Houwink Relationship). The value of the exponent a is affected by the macromolecule conformations Flexible coils have the values between 0.5 and 0.8, the higher values are typical for stiff anisotropic ( rod -like) molecules, and much lower (even negative) values are associated with dense spherical conformations. 

Each of these groups of phases includes the numerous items of various trade names, different average molecular weights, viscosity, thermal stability, and so forth, but all of them are very close to each other by polarity. Up to the middle of the 1970s, the preferred nonpolar phase was squalane (isoprenoid alkane C30H62). This phase is no longer used because of its low thermal stability (only about 110°C). However, this obsolete phase maintains its importance as a nonpolar standard in gas chromatography. Other phases may be characterized by differences of RI values of specially selected test compounds between the phase under consideration and squalane, for example ... 

Molecular weight Viscosity of 0.5% solution in acetone at 25 C Included (or adsorbed) acidity Insoluble (in acetone)... 

Through such combinatorial experiments, we can determine the optimal enzyme combinations needed for targeted molecular weight, viscosity, or optical den-... 

Critical viscosity of a melt, i.e., the value of r Q at the critical molecular weight. Viscosity of a plasticized but undiluted polymer at the critical molecular weight. Viscosity of a solvent. 

The dielectric constant and loss tangent are the substrate variables. The loss tangent is apparently related to variables such as the molecular weight, viscosity, and conductivity of the material to be dried. Some examples will serve to illustrate the difficulty in predicting the rate at which a material will be heated. 

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