1963
DOI: 10.1021/j100801a019
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Dilute Solution Properties of Tactic Poly-(Methyl Methacrylates). Ii. Isotactic Fractions in a Theta Solvent

Abstract: Precipitation temperature-concentration measurements on fractions of different molecular weight were used to obtain the theta temperature of isotactic poly-(methyl methacrylate) in acetonitrile, 27.6°. Intrinsic viscosities of a number of fractions were measured at 20, 27.6, 35, and 50°. These measurements were used to calculate the intrinsic viscosity-molecular weight relationship at each temperature and various derived quantities for each molecular weight used.

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Cited by 25 publications
(6 citation statements)
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“…Intrinsic Viscosity [17]. Intrinsic viscosity data for all the i-PMMA samples in acetonitrile at 28.0 °C are summarized in Table 2 along with the values of the Huggins coefficient k'.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Intrinsic Viscosity [17]. Intrinsic viscosity data for all the i-PMMA samples in acetonitrile at 28.0 °C are summarized in Table 2 along with the values of the Huggins coefficient k'.…”
Section: Resultsmentioning
confidence: 99%
“…Analysis of [17] on the Basis of the HW Model. We first analyze the data for [77] as usual on the basis of the HW touched-bead model.…”
Section: Discussionmentioning
confidence: 99%
“…The conditions of i-PMMA were reported to be at 26.5 °C in butyl chloride and at 27.6 °C in acetonitrile. 33 In one paper,34 acetonitrile is also the solvent at 44.0 °C for atactic PMMA with fT -0.79. We cannot explain the difference in the value of 7V?7 at 26.5 °C between butyl chloride and acetonitrile, but it may be caused by a difference in the conditions, e.g., solvation.…”
Section: Resultsmentioning
confidence: 99%
“…Now, according to the HW model, a flexible polymer chain in dilute solution may be pictured as a regular helix (i.e., the characteristic helix) disturbed (or destroyed) by thermal fluctuations or a random coil retaining more or less helical portions. The shape of the characteristic helix may be determined as a space curve by the radius p and pitch h, which may be written in terms of *o and to as p = k0/U02 + t02) (18) h = 2lTT0/(KQ2+TQ2) (19) and the degree of disturbance (thermal fluctuation) may be represented by the parameter X {=k^TI2t with k% the Boltzmann constant, T the absolute temperature, and « the bending force constant), so that the regular helical structure is destroyed to a less extent in the chain with larger stiffness X-1. In general, the chain of strong helical nature has large p (compared to h) and large X-1, and thus retains rather large and clearly distinguishable helical portions in dilute solution.…”
Section: Resultsmentioning
confidence: 99%