Zur experimentellen Bestimmung der statistischen Parameter β und h(z) des 2. osmotischen Virialkoeffizienten von Polymerlösungen

Schulz, G. V.; Haug, Achim; Kirste, R. G.

doi:10.1524/zpch.1963.38.1_2.001

Cited by 28 publications

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“…The other [η]– M relationships for PDMS were given by Haug and Meyerhoff:8 Haug and Meyerhoff obtained these results for molecular weights above 200,000. However, Schulz et al9, 10 found the θ state at 29 °C in BCH in the molecular weight range 3.3 × 10 4 to 1.06 × 10 6 : Lapp et al4 studied PDMS in the molecular weight range 2600–625,000 and found the following: Brzezinski et al11 studied the intrinsic viscosities of PDMS in the molecular weight range 3000–300,000. The [η]– M relationship for toluene at 25 °C was The unperturbed dimensions of the PDMS chain appeared to be affected by the solvent medium.…”

Section: Introductionmentioning

confidence: 99%

Solution properties of poly(dimethyl siloxane)

Büyüktanir¹,

Küçükyavuz²

2000

J. Polym. Sci. B Polym. Phys.

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The solution properties of poly(dimethyl siloxane) (PDMS) were studied with light scattering (LS), gel permeation chromatography/light scattering (GPC/LS), and viscometry methods. PDMS samples were fractionated, and the weight‐average molecular weights, second virial coefficient, and the z‐average radius of gyration of each fraction were found according to the Zimm method with the LS technique. In this work, the molecular weight range studied was 7.5 × 104 to 8.0 × 105. Molecular weights and molecular weight distributions were determined by GPC/LS. The intrinsic viscosities of these fractions were studied in toluene at 30 °C, in methyl ethyl ketone (MEK) at 20 °C, and in bromocyclohexane (BCH) at 26 °C and 28 °C. The Mark–Houwink–Sakurada relationship showed that toluene was a good solvent, and MEK at 20 °C and BCH at 28 °C were θ solvents for PDMS. The unperturbed dimensions were calculated with LS and intrinsic viscosity data. The unperturbed dimensions, expressed in terms of the characteristic ratio, were found to be 6.66 with different extrapolation methods in toluene at 30 °C. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2678–2686, 2000

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Section: Introductionmentioning

confidence: 99%

Solution properties of poly(dimethyl siloxane)

Büyüktanir¹,

Küçükyavuz²

2000

J. Polym. Sci. B Polym. Phys.

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Sedimentation Coefficients, Diffusion Coefficients, Partial Specific Volumes, Frictional Ratios, and Second Virial Coefficients of Polymers in Solution

Lechner

Nordmeier

Steinmeier

1999

The Wiley Database of Polymer Properties

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Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen des Lösungszustandes von Polyethylen mittels Lichtstreuungsmessungen

Schröder

Arndt

1979

Acta Polymerica

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Carl Schorlemmer", Sektion Chemie, DDR -42 Merseburg Von fraktionierten und unfraktionierten Polyethylenproben wurden in unterschiedlichen Losungsmitteln und bei verschiedenen Temperaturen zw, (rz)>, und A , bestimmt. Die Molmassenzunahme bei Annaherung der MeStemperatur an die Ausfalltemperatur und das Verhalten des 2. Virialkoeffizienten weisen aus, daS Polyethylen in einem schlechten Losungszustand vorliegt und groRe Polymermolekule kugelformig sind. Hccne8osanua omnocumenbno paasemsnenuii yennbax aoneKyn. X . Hccne8oeanuz o cocmosnuu pacmsopoe nonuamu~cena Aemoaoa ceemopacceanus &IR @paKqHOHIIPOBaHHbIX II He@paKqHOHIIpOBaHHbIX o6pa3qo~ nOJIH3THJIeHa OIlpeAeJIHJIHCb P,, (r2)>, II A, B pa3JIIIYHbIX PaCTBOpHTeJIRX IIpII pa3JIIIYHbIX T e M I I e p a T y p a X . YBeJIIIYeHIIe MOJIeKyJIRpHOfi MaCCbI IIpII ~P I I~J I I IKa3bIBaIOT, YTO IIOJIII3THJIeH HaXOARTCR B IIJIOXOM COCTOFIHHII P a C T B O p a II YTO K p y I I H b I e IIOJIHMepHbIe MOJIeKyJIbI x e H m m 3~e p~e~o f i T e M n e p a T y p b I H a T e M n e p a T y p y o c a x n e H m II n o s e g e H m e 2. B x p m a m H o r o K O~@ @ H~H~H T~ nom M e w r m a p o o 6 p a 3~~f i BHA. Investigations o n the branching of chain riaolecules. X . Ligth scattering investigations of the dissolution of polyethylene With fractionated and non-fractionated samples of polyethylene in various solvents a t different temperatures the values of M,, (r,)), and A , were determined. The increase of molecular weight on approaching the precipitation temperature and the second virial coefficient show that polyethylene is comparatively poorly dissolved and the big polymer molecules are of spherical shape.

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Zur experimentellen Bestimmung der statistischen Parameter β und h(z) des 2. osmotischen Virialkoeffizienten von Polymerlösungen

Cited by 28 publications

References 0 publications

Solution properties of poly(dimethyl siloxane)

Solution properties of poly(dimethyl siloxane)

Sedimentation Coefficients, Diffusion Coefficients, Partial Specific Volumes, Frictional Ratios, and Second Virial Coefficients of Polymers in Solution

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen des Lösungszustandes von Polyethylen mittels Lichtstreuungsmessungen

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