Investigation of conformational transition in poly(cyclohexyl methacrylate)

Katime, Issa; Ibarra, X.; Garay, M. T.; Valenciano, R.

doi:10.1016/0014-3057(81)90008-2

European Polymer Journal

1981

DOI: 10.1016/0014-3057(81)90008-2

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Investigation of conformational transition in poly(cyclohexyl methacrylate)

Issa Katime

X. Ibarra

M. T. Garay

et al.

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1983

1991

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Cited by 17 publications

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“…; Academic: New York, 1975; Chapter IV.) (19) Since eq 30 has been claimed to be incorrect by some people,20, we add some words to justify it. In the mentioned symmetrical case with a small Xi2°, eq 26 reads…”

mentioning

confidence: 99%

Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

Tsitsilianis¹,

Dondos²

1987

Macromolecules

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mentioning

confidence: 99%

Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

Tsitsilianis¹,

Dondos²

1987

Macromolecules

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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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Viscosity–temperature relationships for dilute solutions of poly(cyclohexyl methacrylate) in methyl isobutyl ketone

Katime

Ochoa

1984

J of Applied Polymer Sci

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Usually, the temperature dependence of the absolute viscosity q can be written as where RTis the thermal energy and Q is the apparent activation energy of viscous flow which is constant over a limited temperature range. The meaning of the preexponential term A is related to a n activation entropy. This expression is of the Arrhenius form and has been called the Guzman-Andrade equation, which was theoretically derived by Eyring.' Thus, the absolute viscosity of a liquid is given by where N a n d h are, respectively, the Avogadro number and the Planck's constant, V is the molar volume of the liquid, and S is the entropy of activation of viscous flow.From eqs.(1) and (2) we obtainMeasurements of absolute viscosities of dilute polymer solutions and their thermal variation are often employed as a way to characterize properties of macromolecules in solution.',2Moore et a1.4-6 have related the A and Q parameters of the Guzman-Andrade equation to the polymer flexibility and thermodynamic properties of polymer-solvent systems.In this article, we have used eq. (1) to study the behavior of the poly(cyclohexy1 methacrylate) (PCHM) in methyl isobutyl ketone on the temperature range 283-313 K. EXPERIMENTALCyclohexyl methacrylate (Fluka purum) was washed three times with sodium hydroxide followed by distilled water; it was dried over anhydrous NazSO, and distilled ( < 25 mm Hg) in pure dried nitrogen.A sample of poly(cyclohexy1 methacrylate) was obtained by radical polymerization using 1,2-azobisisobutyronitrile (Fluka puriss) as initiator in benzene, at 328 K. The polymer obtained was fractionated by solubility in the system pdioxanelmethanol. All fractions were purified by dissolving in benzene and reprecipitation with methanol. They were freeze-dried.All solvents were analytical grade froE Fluka.Number average molecular weights M, and weight average molecular weights z,, were determined by membrane osmometry and laser light scattering, respectively. In Table I, it can be seen the molecular weights and polydispersity index of the five fractions employed in this work. Viscosities of both pure solvent and polymer solutions were measured, at several temperatures (283-313 K), by means of an modified Ubbelohde viscometer. The kinetic energy corrections were less than 0.2%. The bath temperature was regulated to k0.02 K. Intrinsic viscosities were obtained by graphical extrapolation of both q,,/c and In q,/c to zero concentration of polymer.

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Investigation of conformational transition in poly(cyclohexyl methacrylate)

Cited by 17 publications

References 14 publications

Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

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

Viscosity–temperature relationships for dilute solutions of poly(cyclohexyl methacrylate) in methyl isobutyl ketone

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