On the contraction factors of long-chain branched macromolecules

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F14%3A00424181" target="_blank" >RIV/61389013:_____/14:00424181 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2013.11.010" target="_blank" >http://dx.doi.org/10.1016/j.eurpolymj.2013.11.010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2013.11.010" target="_blank" >10.1016/j.eurpolymj.2013.11.010</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the contraction factors of long-chain branched macromolecules

Popis výsledku v původním jazyce

For several decades, the relation between the contraction factor of radius of gyration for branched macromolecules, g, and that of intrinsic viscosity, g, has been presented as g = g?. The value of ? was assumed to be constant for branched macromoleculesof a certain type, such as stars, or combs, or statistically branched macromolecules. Experimentally determined values of ?, however, turn out in the majority of cases to be molecular-weight dependent. The present study shows that molecular-weight-independent values of ? can be expected only for a plurality of molecules with identical architecture. By branched molecules with identical architecture we mean molecules in which with varying degree of polymerization the ratios of the degrees of polymerization of all sub-chains remain constant, irrespective of the integral degree of polymerization of individual molecules. Also, it has been demonstrated that the ratio of intrinsic viscosities of a linear and a branched polymer molecule having

Název v anglickém jazyce

On the contraction factors of long-chain branched macromolecules

Popis výsledku anglicky

For several decades, the relation between the contraction factor of radius of gyration for branched macromolecules, g, and that of intrinsic viscosity, g, has been presented as g = g?. The value of ? was assumed to be constant for branched macromoleculesof a certain type, such as stars, or combs, or statistically branched macromolecules. Experimentally determined values of ?, however, turn out in the majority of cases to be molecular-weight dependent. The present study shows that molecular-weight-independent values of ? can be expected only for a plurality of molecules with identical architecture. By branched molecules with identical architecture we mean molecules in which with varying degree of polymerization the ratios of the degrees of polymerization of all sub-chains remain constant, irrespective of the integral degree of polymerization of individual molecules. Also, it has been demonstrated that the ratio of intrinsic viscosities of a linear and a branched polymer molecule having

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GCP205%2F11%2FJ043" target="_blank" >GCP205/11/J043: Komplexní studium náhodně větvených amphifilních kopolymerů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Polymer Journal

ISSN

0014-3057

e-ISSN

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Svazek periodika

51

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

177-181

Kód UT WoS článku

000331916600018

EID výsledku v databázi Scopus

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