Evaluation of GPC methods for estimation of Mark–Houwink–Sakurada constants

Dobbin, C. J. B.; Rudin, Alfred; Tchir, Morris F.

doi:10.1002/app.1980.070251229

Cited by 44 publications

(13 citation statements)

References 5 publications

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“…Inserting experimental values of [ 771 and Z Wi J i into eqs. (6 ) and ( 7 ) allows determination of K and a. A calibration curve of molecular weight versus elution volume for P3HT was constructed from narrow molecular weight polystyrene standards by inserting K and a values for both P 3 H T and polystyrene into eq.…”

Section: Determination Of Molecular Weightmentioning

confidence: 99%

Determination of molecular weights and Mark–Houwink constants for soluble electronically conducting polymers

Holdcroft

1991

J Polym Sci B Polym Phys

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Intrinsic viscosities and gel permeation chromatography data were used to evaluate the Mark–Houwink constants of the soluble electronically conducting polymer, poly(3‐hexylthiophene) (P3HT):K and a are 2.28 × 10‐3 cm3/g and 0.96, respectively, in tetrahydrofuran (THF) at 25°C. Mark–Houwink constants were used to calibrate gel permeation chromatography (GPC) columns for P3HT. Number‐average molecular weights of P3HT determined with modified calibration curves agreed well with those determined by an absolute method, embulliometry. Molecular weights estimated using unmodified polystyrene calibration procedures were significantly larger than true values.

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Section: Determination Of Molecular Weightmentioning

confidence: 99%

Determination of molecular weights and Mark–Houwink constants for soluble electronically conducting polymers

Holdcroft

1991

J Polym Sci B Polym Phys

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“…One method employed n,, and intrinsic viscosity data from a single poiymer,21 while the second procedure used intrinsic viscosities of two different polymer samples in the GPC solvent. 22 The second method was tried with intrinsic viscosity ratios from four different high-molecular-weight samples and one low-molecular-weight specimen. Not all the combinations produced viscosity ratios for which the GPC data calculations converged.…”

Section: Resultsmentioning

confidence: 99%

Effects of water on starch‐g‐polystyrene and starch‐g‐poly(methyl acrylate) extrudates

Henderson

Rudin

1982

J of Applied Polymer Sci

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synopsisPolystyrene and poly(methy1 acrylate) were grafted onto wheat starch by gamma radiation and chemical initiation, respectively. The respective percent add-on values were 46 and 45; 68% of the polystyrene formed was grafted to starch, and the corresponding proportion of poly(methy1 acrylate) was 41%. T h e molecular weight distributions of the homopolymer and graft portions were characterized. and extrusion conditions were established for production of ribbon samples of starch-g-PS and starch-g-PMA. Both copolymer types were considerably weakened by soaking in water, and this effect was more immediak and drastic for starch-g-poly(methy1 acrylate). Both graft copolymers regained their original tensile strengths on drying, but the poly(methy1 acrylate) specimens did not recover their originai unswollen dimensions and retained high breaking elongations characteristic of soaked specimens. Tensile and dynamic mechanical properties of extruded and molded samples of both graft polymers are reported, and the plasticizing effects of water are summarized. INTRODUCTIONThere are numerous publications on the syntheses of thermoplastic graft c'opolymers of starch and cellulose, as summarized in recent review articles on the subject.1-4 Comparatively little has appeared, however, on the processing of such materials and their physical properties.5-9 This article reports reaction conditions for the synthesis of starch-g-polystyrene and starch-g-poly(methy1 acrylate) copolymers which produce good-quality extrudates. These materials were characterized with respect to the amount and molecular weight distributions of the thermoplastic portions that were grafted. Extrusion conditions for production of apparently homogeneous specimens are reported, and some mechanical and dynamic mechanical properties of the extrudates are reviewed. These copolymers contain large proportions of starch, and it was of interest to determine the effect of water on the properties of such materials. These observations are reported here. EXPERIMENTALSupergel 1201C wheat starch (International Grain Products, Montreal, Canada) supplied with nominal 11.8 w t % moisture was used throughout this work. Styrene and methyl acrylate were washed with 1Wo sodium hydroxide to extract phenolic inhibitors, distilled under reduced pressure, and freeze-thawed to remove oxygen before polymerization.Cobalt-60 radiation was used in the synthesis of starch-g-polystyrene.slo Starch, 100 g, 30 mL distilled H20, and 150 g styrene were triturated in a glass Journal of Applied Polymer Science, Vol. 27,4115-4135 (1982) where t is the time in years, A0 is the initial source intensity, At is the intensity after time t, and 5.27 is the ~C O half-life in years. After the reaction, the jar was broken away from the solid white copolymer mass, and the product was dried for several hours in a vacuum oven at 60°C and 30 torr pressure and then crushed into a powder.The homopolymer and graft copolymer composition of the product was analyzed as follows. Ungrafted polystyrene (PS) was ext...

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“…Bei der zweiten Gruppe von Eichverfahren wird von dem von BENOIT et al [5] entwickelten Konzept der Gultigkeit einer ,,universellen" Eichfunktion ausgegangen, aus der sich mit den entsprechenden KUHN-MARK-HOWWINK-Gleichungen die Eichbeziehungen fur beliebige Polymere berechnen lassen. Hier ist besonders der Algorithmus von WEISS et al [6] und DOBBIN et al [7] hervorzuheben, bei dem die Parameter der KUHN-MARK-HOUWINKGleichung durch Anpassung der berechneten GPC-GroSen an die entsprechenden MeSwerte [q], M, oder Y , bestimmt werden.…”

Section: Etnleitungunclassified

Zur Gelchromatographie linearer Polyphenylchinoxaline — Vergleich verschiedener Eichverfahren

Bauer

Schulz

1984

Acta Polymerica

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Die Molmassenverteilungen und die KUHN-MARK-HOUwINK-Gleichung fur lineare Polyphenylchinoxaline werden durch Anwendung von vier verschiedenen GPC-Eichverfahren fur breit verteilte Molmassenstandards berechnet. In Ubereinstimmung der Ergebnisse der Verfahren werden SCHULZ-FLORY-Verteilungen erhalten. 0 zefibxpv.uamozpa@u mmeiinbzx nonu~enuJtxunomafiunoe -cpasnenue pa3fiuunb&x mmoaoe liafiu6poem PaClIpeAeJIeHHR MOJIeKyJIRpHhlX MaCC B YpaBHeHHe HYHA-MAPKA-XAYBHHKA RXJ3 XHHefiHHX IIOJIH$eHHJIXHHOKCaJIHHOB ~H J I H PaCCYHTaHH YeTbIpbMFI pa3JIH4HbIMII MeTOAaMH rnX-KaJIH6POBKH AJIH IIIBPOKO-PaCnpeReJIeHHblX CTaHAapTOB. AJIR BCeX MeTOAOB 6bmn IIOJIyWHbl paCnpeAeJIeHHA TKna NYJIbLI H @JIOPH. On the gel permeation chromatography of linear polyphenylquinoxalines -comparison of different calibration methods Molecular weight distributions and the KUHN-M-~RK-HOUWINK equation for linear polyphenylquinoxalines are calculated by application of four different GPC-calibration methods useful for broadly distributed molecular weight standards. I n good agreement of the results SCHULZ-FLORY distributions are obtained.

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Evaluation of GPC methods for estimation of Mark–Houwink–Sakurada constants

Cited by 44 publications

References 5 publications

Determination of molecular weights and Mark–Houwink constants for soluble electronically conducting polymers

Determination of molecular weights and Mark–Houwink constants for soluble electronically conducting polymers

Effects of water on starch‐g‐polystyrene and starch‐g‐poly(methyl acrylate) extrudates

Zur Gelchromatographie linearer Polyphenylchinoxaline — Vergleich verschiedener Eichverfahren

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