Solution properties of ultrahigh molecular weight polymers, 15. A viscometric study of poly(isobutyl methacrylate) in different solvents

Simionescu, Bogdan C.; Ioan, Silvia; Flondor, Aurelia; Simionescu, C. I.

doi:10.1002/apmc.1987.051520111

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…At the critical concentration, c ′, a change in the slope of the straight lines, representing the variation of reduced viscosity as a function of concentration was observed for all the PAN samples, as seen in Fig 1. For an accurate determination of the critical concentration c ′, where (η sp / c ) versus ( c ) dependencies change the slope due to abnormal solution behaviour, a method suggested by Hernandez‐Fuentes was used 28, 29. The [η] and K H values were determined for groups of three concentrations starting initially from the more dilute concentration regime.…”

Section: Resultsmentioning

confidence: 99%

Dilute solution viscosity properties of high molar mass poly(acrylonitrile‐co‐itaconic acid)

Devasia

Nair

Ninan

2003

Polymer International

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The intrinsic viscosities [η] and viscosity constants of high molar mass poly(acrylonitrileco-itaconic acid) copolymer in DMF were obtained by the methods of Huggin, Fuoss, Martin and Schulz-Blaschke. The values of [η] by averaging procedures suggested by Sakai were close to those from Huggins method. There was an abnormal positive deviation from the rectilinearity of the reduced viscosity (η red ) versus concentration (c) plot in all the cases in the dilute regime, which was attributed to the polyelectrolytic effect. This was further confirmed by the analysis by Fuoss method. The deviation from the Huggins dependence is discussed for a good solvent (DMF) alone and in the presence of a non-solvent, methanol. The deviation cross-over points c and c changed with molecular weight, and the concentration range greater than c and less than c * was taken for a more reliable determination of intrinsic viscosity. The non-solvent played a key role in determining the polymer-polymer interactions. The Huggins coefficient increased and the cross-over points c and c shifted to higher concentration regime as the mixed solvent became poorer. The inter-and intra-polymer interactions increased in the presence of methanol. In poor solvent, the enhanced intramolecular interactions caused the polymer to shrink in size, causing a reduction in [η] and hydrodynamic volume.

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Section: Resultsmentioning

confidence: 99%

Dilute solution viscosity properties of high molar mass poly(acrylonitrile‐co‐itaconic acid)

Devasia

Nair

Ninan

2003

Polymer International

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“…ExprrirrientnlPoly( isobutyl methacryla te) (PiBuMh) samples were obtainetl by plasma-intlucetl polymerization. The conditions of this new method of polymer synthesis were previously reported in tletail[3, 41. Polymer samples were submitted to fractionation using toluene-methanol mixtures as solvent-precipitant systems.…”

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confidence: 99%

Solution properties of ultrahigh molecular weight polymers. 17. Conformational transitions of poly(isobutyl methacrylate) in dilute solution

Ioan¹,

Flondor²,

Simionescu³

et al. 1991

Acta Polymerica

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Acta Polymeric8 52 ((991) Nr. 5 230 IOAN, FLONDOR ct al.: Snlut,ion properties o f ultraliigh molecular wciglit polymers. 17 erkennen, ilaO die anionisch motlifizierten Fascrn (Probe 1) erwartungsgemiiB nicht mit dem ebenfalls negativ geladenen Quarz wechselwirken und die Extinktion im untersuchten Bereich gleich tlerjenigen der Nullprobe ist. Die kationische Funktionalisierung der Probe 2 bewirkt, dall die Extinktion i n hbhangigkeit vom Masseverhaltnis Quarz zu Fasern stark abnimmt. In den Bildern 2 und 3 ist der EinfluB der zunehmenden mechanischen Beanspruchung durch die Erhohung der Ruhrerdrehzahl dargestellt. WGhrend i m Bild 2 bei Quarz keine signifikante Drehzahlabhangigkeit feststellbar ist, steigt die Extinktion beiKaolin i m untersuchten Bereich stark a n (Bild 3). Die Ursache dafur ist sowohl in der zunehmenden Dispergierung des Kaolins zu suchen als auch in einer partiellen hblosung des Kaolins von der Faseroberfliiche. In beiden Fallen jedoch liegt die Extinktion bei Verwendung der Fasern erheblich unter derjenigen der Nullprobe.

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Solution properties of ultrahigh‐molecular‐weight polymers, 16. Unperturbed dimensions of poly(isobutyl methacrylate)

Simionescu¹,

Ioan²,

Flondor³

et al. 1988

Makromol. Chem.

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Three techniques, i. e., the Lenka extrapolation method, the Stockmayer-Fixman meth>d, and the extrapolation of the Mark-Houwink constants to a = 0,5 were applied to determine the unperturbed dimensions of ultrahigh-molecular-weight poIy(isobuty1 methacrylate). A correction term, depending on the exponent a of the Mark-Houwink relation, is suggested to be introduced into the Stockmayer-Fixman-Burchard equation.

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Solution properties of ultrahigh molecular weight polymers, 15. A viscometric study of poly(isobutyl methacrylate) in different solvents

Cited by 8 publications

References 15 publications

Dilute solution viscosity properties of high molar mass poly(acrylonitrile‐co‐itaconic acid)

Dilute solution viscosity properties of high molar mass poly(acrylonitrile‐co‐itaconic acid)

Solution properties of ultrahigh molecular weight polymers. 17. Conformational transitions of poly(isobutyl methacrylate) in dilute solution

Solution properties of ultrahigh‐molecular‐weight polymers, 16. Unperturbed dimensions of poly(isobutyl methacrylate)

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