number-average molecular weight

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• molecular weight — n. the relative average weight of a molecule of a substance, expressed by a number equal to the sum of the atomic weights of all atoms in the molecule …   English World dictionary

• number — 1. A symbol expressive of a certain value or of a specific quantity determined by count. 2. The place of any unit in a series. atomic n. (Z) the n. of protons in the nucleus of an atom; it indicates the position of the …   Medical dictionary

• Molecular mass — This article is about the mass of a single molecule. For the mass of a substance commonly used in basic stoichiometric calculations, see Molar mass. Assuming hydrogen and oxygen are standard weights in this image (as opposed to deuterium oxide)… …   Wikipedia

• saponification number — n a measure of the total free and combined acids esp. in a fat, wax, or resin expressed as the number of milligrams of potassium hydroxide required for the complete saponification of one gram of substance called also saponification value * * *… …   Medical dictionary

• Molar mass distribution — In linear polymers the individual polymer chains rarely have exactly the same degree of polymerization and molar mass, and there is always a distribution around an average value. The molar mass distribution (or molecular weight distribution) in a …   Wikipedia

• Polymer — Appearance of real linear polymer chains as recorded using an atomic force microscope on surface under liquid medium. Chain contour length for this polymer is 204 nm; thickness is 0.4 nm.[1] A polymer is a large molecule (macromolecule …   Wikipedia

• Polyethylene glycol — IUPAC name poly(oxyethylene) {structure based}, poly(ethylene oxide) {source based} …   Wikipedia

• Carothers equation — In step growth polymerization, the Carothers equation (or Carothers equation) gives the number average degree of polymerization, X n, for a given fractional monomer conversion, p .:ar{X} n=frac{1}{1 p}This equation was proposed by Wallace… …   Wikipedia

• Living free radical polymerization — is a type of living polymerization where the active polymer chain end is a free radical. Several methods exist. IUPAC recommends[1] to use the term reversible deactivation radical polymerization instead of living free radical polymerization .… …   Wikipedia

• Vapor pressure osmometry — is a technique to measure the number average molecular weight of a polymer. It is based upon Raoult s law that governs change in vapor pressure of a solution based on the mole fraction of the solute.The vapor pressure osmometer is composed of two …   Wikipedia

• Autoacceleration — (Gel Effect, Trommsdorff Norrish Effect) is a dangerous reaction behavior that can occur in free radical polymerization systems. It is due to the localized increases in viscosity of the polymerizing system that slow termination reactions. The… …   Wikipedia