Polymer separation and characterization by thin-layer chromatography

Inagaki, Hiroshi

doi:10.1007/3-540-08124-0_4

Cited by 36 publications

(7 citation statements)

References 79 publications

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“…6 and 7 reflected a complete separation of homopolymer chains from the block copolymers, two experimental paths were pursued block copolymer samples were mixed with each other and with defined amounts of homopolymer. comprising equal amounts of both (3). The latter trace appears as a mere superposition of the two former ones, as is expected, if the individual components do not mutually influence their elution behaviour.…”

Section: Gradient Elution Of Block Copolymerssupporting

confidence: 65%

“…With this in mind, the correlation encountered in Fig. 11 appears surprisingly good and suggests that in accordance with Eq, (3) there is a linear dependence between the volume fraction of THF at the instant of elution, pl, and the reciprocal square root of the molecular weight of the MMA block. This finding corroborates the assumption that it is the more strongly retained MMA block which dominates the elution behaviour of these block copolymers and causes a retention mechanism to be operative with the influence of solute solubility prevailing over adsorptive interactions.…”

Section: Towards a Retention Model For Block Copolymerssupporting

confidence: 53%

“…The correlation found for the block copolymers reads A = 0,775 and B = -40,OO in terms of Eq. (3). It is instructive to compare this result with the relation applying to narrowly distributed PMMA homopolymer samples which is also included in Fig.…”

Section: Towards a Retention Model For Block Copolymersmentioning

confidence: 90%

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Gradient high performance liquid chromatography of polymers, 2. Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization

Augenstein

Müller

1990

Makromol. Chem.

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Section: Gradient Elution Of Block Copolymerssupporting

confidence: 65%

Section: Towards a Retention Model For Block Copolymerssupporting

confidence: 53%

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Gradient high performance liquid chromatography of polymers, 2. Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization

Augenstein

Müller

1990

Makromol. Chem.

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“…Mn (2) where M" is the number average molecular weight of the copolymer. From here on, the term distribu-604 tion function will always mean the differential distribution function.…”

Section: W(m X)=-n(m X)mentioning

confidence: 99%

Distribution of the Chemical Composition of Block and Graft Copolymers Assuming Gamma Distribution of Molecular Weights of the Precursor Blocks

Stejskal

Kratochvı́l

1982

Polym J

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ABSTRACT:Various models of coupling of precursor blocks leading to the formation of block and/or graft copolymers are defined. Distribution functions of chemical composition, and in some cases also of molecular weights of various types of copolymers have been derived in an analytical form for a case in which precursor blocks obey the Schulz-Zimm (gamma) molecular weight distribution, and the coupling of blocks has a random character. The effect of polydispersity of precursors, simplifying approximations, and certain other factors on the form of distribution functions of the chemical composition of copolymers is discussed. Assumption of another type of molecular weight distribution of precursors does not give qualitatively different results.

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“…Die Autoren hahen den Gehalt an Methylethylkcton bcstimmt, der im Gernisch vorliegeii niul3, damit die Polymerprobe gerade zu wandern beginnt. Die Rf-Wert,e zwisclieii 0 und 0,2, die in der zitierten Arheit aiigestrebt wurden [2], siud jedocli niit besonders Iiohen Werten fur den Verteiluiigskocffizic~~teri verburrden ( 4 < K S 00). Das ist bei der Auswertung Iiindcrlich.…”

Section: Einleitiingunclassified

Dünnschichtchromatographie von Polymeren mit binären Elutionsmitteln

Glöckner

Meißner

1980

Acta Polymerica

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Tcclinische L7iiiversitat Dresden, Scktion Chcmic, DDK -802i Dresden Verscliiedenc Polymere wurden auf Kiesclgelscliich t u n clironia tograpliiert. Durcli graphisclie Iiitcrpolation der e x p o iiiiciitellen Ergebnisse wurden die Elutioiisniit.telgeinisclie bestiiiimt, die zu IiJ-Werten voii etwa O , i fulireu. Aus dcr Zusaiiiiiieiisetzuiig dieser Gernische wurde die Elutionsstarke ey berechnet. ?'ow?cocaoiii4aa xpo&amozpa$ua noAuwepos 6uuapICbl&u 3 m o e~m a .~u XpoMaTorpa@HYecKm MeToAoM Ha CJIORX CmmarenFi pa3~en~nmcb paanwiabre nonmepbr. nyTeM rpa@nqecKofi MHTepIIOJIHqHM 3KCIIepHMeHTanbHbIX 3HaqeHkIfi HafiAeHbI TaKHe CMeCLl BJIIOeHTOB, KOTOPbIe IIpllBOAFIT Ic 3HaYeHIIH PaBHbIM IIpWhH3HTenbHO 0,7. I/ICXOJ(Fi M 3 COCTaBa TaKllX CMeCea BbIYHCJIFiJIaCb 3JIIOaqnOHHaH CIIOCO6IIOCTb E M . r . I liiri lmjer clirortin/ogrtipliy of ~O~~I J L W S rcsirig binur!j cliiarits Various polyincrs \vcrc su1)jcctcd t o cliromai rrgrapliy on silicagel. By graphical interpolation of the results oliiaiired, ilic cluant mixtures leading to /jf values of about 0.7 merc determincd. I:rom the compositiou of these mixtures the elutioii strength was calculated. 1. Einleitiing Polyiuc.rc \verden bei der Duiinschiclitchroinat~gra~~liic (TLC) durch Eiiikomponenteii-PlieI3mittel entweder mit dcr Losungsmittrlfront entwickelt ( H f = l), oder sie laufen gar iiiclit (R/ = 0). (Von dieser Regel gibt es ganz wenigc Ausnahmen.) Weiin die Polymere a m Startpunkt liegenbleibcn, kanii dies cntweder t l a i~~i i liegeu, daI3 sic ini Elutiorismittel unloslicli sind, oder dal3 das Elutionsmittel zu schwach ist, um sie von der Oberfliiche des Adsorbens z u verdrangen. Laufeii die Prohen dagegcn bis zu Rf = 1, d a m ist das Elutiousmittel so stark, daI3 es die -idsorption der Probe verhindert.Wird die Entwicklung rnit Losungsmittelgemischen vorgenorniueii, die hinarc Kombinationen von starken Elutionsniil teln init schwaclren darstellen, so treten Iiauptsachlich wiederum Rr -R:erte voii 0 oder von 1 auf, aber in einem relativ schmalen Intervall, in dern der Ubergang voii dem eineii Grenzfall zurn andercu crfolpt , konneii auch normale lif-Werte erhalteii werden.Dies zcigt , cia0 die Adsorptionschromatographie voii Polymeren rrioglicli ist, wenn die freie Energie der Adsorption zwischen Pol)-mer und FlieSmittel genau ausbalancicrt ist. (Daneben spielt in vielen Fallen sicher auch ein Gradient eine Rolle, der sich vor allem bei der Uunnschichtcliromatographie aucli ohne bewul3tes Zutun ausbildet.) Der Ubergang zur chromatograpliischen Jlohilitat iu Gemischen aus Tctrachlorkol-ilenstoff und Methyletliylketon ist von KAMIYAMA und INAGAKI [l] zum husgaiigspunkt fur Betrachtungen uber grundlegeiide Forderuiigen a n die Elutionsmittel bei der TLC von Polymererr gewahlt worden. Die Autoren hahen den Gehalt an Methylethylkcton bcstimmt, der im Gernisch vorliegeii niul3, damit die Polymerprobe gerade zu wandern beginnt. Die Rf-Wert,e zwisclieii 0 und 0,2, die in der zitierten Arheit aiigestrebt wurden [2], siud jedocli niit besonders Iiohen Werten fur den Verte...

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Polymer separation and characterization by thin-layer chromatography

Cited by 36 publications

References 79 publications

Gradient high performance liquid chromatography of polymers, 2. Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization

Gradient high performance liquid chromatography of polymers, 2. Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization

Distribution of the Chemical Composition of Block and Graft Copolymers Assuming Gamma Distribution of Molecular Weights of the Precursor Blocks

Dünnschichtchromatographie von Polymeren mit binären Elutionsmitteln

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