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Molar mass distribution information


In polymer chemistry, the molar mass distribution (or molecular weight distribution) describes the relationship between the number of moles of each polymer species (Ni) and the molar mass (Mi) of that species.[1] 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 of a polymer may be modified by polymer fractionation.

IUPAC definition for average degree of polymerization in polymer chemistry
IUPAC definition for average degree of polymerization in polymer chemistry.
  1. ^ I. Katime "Química Física Macromolecular". Servicio Editorial de la Universidad del País Vasco. Bilbao

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Molar mass distribution

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In polymer chemistry, the molar mass distribution (or molecular weight distribution) describes the relationship between the number of moles of each polymer...

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Molar mass

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In chemistry, the molar mass (or molecular weight) (M) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured...

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Molecular mass

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mass and relative molecular mass are distinct from but related to the molar mass. The molar mass is defined as the mass of a given substance divided...

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Lignin characterization

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chromatography-mass spectrometry (py-GC-MS) or nuclear magnetic resonance spectroscopy (NMR).[citation needed] The molar mass distribution of lignin describe...

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Poisson distribution

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system, astronomy: photons arriving at a telescope, chemistry: the molar mass distribution of a living polymerization, biology: the number of mutations on...

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Repeat unit

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product nMR. Other than monodisperse polymers, there is normally a molar mass distribution caused by chains of different length. In copolymers there are two...

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Gel permeation chromatography

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molecular weight (Mn), the weight average molecular weight (Mw) (see molar mass distribution), the size average molecular weight (Mz), or the viscosity molecular...

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Chemical substance

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molar mass distribution. For example, polyethylene is a mixture of very long chains of -CH2- repeating units, and is generally sold in several molar mass...

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MV

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electrical potential mv (mass × velocity), momentum in physics Mv, viscosity average molar mass, a method to quantify molar mass distribution in chemistry Mesovortex...

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Absolute molar mass

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Absolute molar mass is a process used to determine the characteristics of molecules. The first absolute measurements of molecular weights (i.e. made without...

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Chemical kinetics

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transfer in a chemical reactor in chemical engineering and the molar mass distribution in polymer chemistry. It is also provides information in corrosion...

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Dimethylacetamide

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it is used in gel permeation chromatography to determine the molar mass distribution of cellulose samples. Dimethylacetamide is also used as an excipient...

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Amount of substance

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daltons, and the molar mass of an isotope in grams per mole is equal to the mass number. For example, a molecule of water has a mass of about 18.015 daltons...

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Polymer chemistry

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described in many ways: its degree of polymerisation, molar mass distribution, tacticity, copolymer distribution, the degree of branching, by its end-groups, crosslinks...

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Dispersity

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definition ĐM = Mw/Mn where Mw is the mass-average molar mass (or molecular weight) and Mn is the number-average molar mass (or molecular weight). Pure Appl...

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Chromatography

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with multiangle light scattering (MALS) achieves more accurate molar mass distribution when compared to off-line MALS than SEC in significantly less time...

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Living cationic polymerization

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species. It enables the synthesis of very well defined polymers (low molar mass distribution) and of polymers with unusual architecture such as star polymers...

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Mass spectrometry

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species to produce adducts rather than a protonated species. Mass spectrometry can measure molar mass, molecular structure, and sample purity. Each of these...

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MMD

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MMD may refer to: Molar mass distribution, in a polymer MultiMarkdown, a markup language Multiple dispatch, a feature of some programming languages MMD...

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Monoisotopic mass

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molecule and is an integer. It also is different from the molar mass, which is a type of average mass. For some atoms like carbon, oxygen, hydrogen, nitrogen...

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Polymer Char

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analysis. Chemical composition distribution Chemical composition distribution (CCD) together with the molar mass distribution (MMD) and their interdependence...

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Random graph theory of gelation

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identification of the gel point, gel fraction, size distribution of polymers, molar mass distribution and other characteristics for a set of many polymerising...

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Mass diffusivity

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Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion...

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Equivalent weight

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used) are now derived from molar masses. The equivalent weight of a compound can also be calculated by dividing the molecular mass by the number of positive...

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Reference ranges for blood tests

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concentrations from the molar to the mass concentration scale above are made as follows: Numerically: molar concentration × molar mass = mass concentration {\displaystyle...

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