molecular-weight distribution

molecular-weight distribution

[mə′lek·yə·lər ¦wāt ‚di·strə′byü·shən]
(organic chemistry)
Frequency of occurrence of the different molecular-weight chains in a homologous polymeric system.
References in periodicals archive ?
The contents of EU rubber, extracted from leaves of Eucommia ulmoides, were determined by the gravimetric method, and the molecular-weight and molecular-weight distribution were determined by gel permeation chromatography (GPC).
Its molecular weight is slightly higher than standard PS, and it has a much broader molecular-weight distribution.
log G" plot is independent of the molecular weight, the short-branch length, and the testing temperature, it depends strongly on the molecular-weight distribution, and the degree of long-chain branching and its distribution (8).
The narrow molecular-weight distribution and broad crystallinity distribution of Versify copolymers result in improved temperature performance over that of similar metallocene products.
Basell has two new grades of Metocene mPP homopolymers for injection molding, both of which are nucleated and have very narrow molecular-weight distribution.
The "super-strength" resins have a narrower molecular-weight distribution and more homogeneous short-chain branching distribution than the conventional hexene resins, leading to a lower elasticity and less orientation in the film, and a lower concentration of lower-molecular weight species for improved film blocking.
The effect is temporary and is accomplished without additives, change in molecular-weight distribution, or any performance tradeoff, says Coperion.
Irgatec CR 76 is a non-peroxide modifier that provides controlled degradation of a low-MFR PP into a high-flow resin with narrow molecular-weight distribution.
Versify polymers have narrow molecular-weight distribution but broad composition and crystallinity distribution, which is said to result in improved heat resistance compared with metallocone-based products of comparable olefin content.

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