Hydrodynamic properties of polystyrene in dilute n-butyl chloride solution

Lewis, M.; Nan, Shouyan; Mays, Jimmy W.

doi:10.1021/ma00001a031

Cited by 19 publications

(5 citation statements)

References 3 publications

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“…Our literature search revealed that the MHS equation holds only for high molar mass polymers in good solvents when the excluded volume effect is present. As the molecular weight decreases, the excluded volume effect vanishes progressively to zero, and the contribution of local chain conformation increases. − This gradual appearance of the excluded volume effect with increasing molecular weight is absent in a theta solvent. Therefore, the large uncertainties in K in the good solvents were a direct consequence of the use of samples with insufficiently high molecular weights.…”

Section: Resultsmentioning

confidence: 99%

Viscometric Study of Poly(2-cinnamoyloxyethyl methacrylate)

Hong

Liu

2010

Macromolecules

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Six poly(2-cinnamoyloxyethyl methacrylate) (PCEMA) samples with low polydispersity indices were derived from precursors prepared by anionic polymerization. Their intrinsic viscosities were determined in tetrahydrofuran (THF) and chloroform at 25 °C and in p-xylene between 55 and 82 °C. The data were treated to yield the Mark−Houwink−Sakurada parameters K and a. The a values suggested that THF and chloroform were good solvents for PCEMA at room temperature. The intrinsic viscosity data obtained in p-xylene were also analyzed by the Burchard−Stockmayer−Fixman method. Both the a values and the results of data treatment by the Burchard−Stockmayer−Fixman method suggest that p-xylene was a theta solvent for PCEMA at 60 °C. Using the K value at the theta temperature, we determined for PCEMA a characteristic ratio of 12.6, which is the ratio between its mean-square end-to-end distance in a theta solvent and that of a random flight chain.

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Section: Resultsmentioning

confidence: 99%

Viscometric Study of Poly(2-cinnamoyloxyethyl methacrylate)

Hong

Liu

2010

Macromolecules

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“…From a different point of view, the Einstein equation can also be expressed in terms of viscometric volume ( V η ) In the past few decades, V η , i.e., the multiply of [η] and M , has been widely accepted as a universal parameter reflecting the viscometric volume of polymers with an arbitrary architecture. − Both V η and R η have been widely used to characterize the structural feature of polymers. Namely, Wales et al and Mays et al studied how R η / R h changes with the type of polymers and solvents under good solvent conditions. , Graessley et al quantified the values of R g , R h , and R η of linear polyisoprenes in cyclohexane by light scattering and viscometric study . Striegel et al used R η to analyze the influence of long-chain branching on the size of polysaccharides with ultrahigh molar mass .…”

Section: Resultsmentioning

confidence: 99%

“…45−47 Both V η and R η have been widely used to characterize the structural feature of polymers. Namely, Wales et al and Mays et al studied how R η /R h changes with the type of polymers and solvents under good solvent conditions 48,49. Graessley et al quantified the values of R g , R h , and R η of linear polyisoprenes in cyclohexane by light scattering and viscometric study 50.…”

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confidence: 99%

Experimental Validation on Average Conformation of a Comblike Polystyrene Library in Dilute Solutions: Universal Scaling Laws and Abnormal SEC Elution Behavior

Pan

Ding

2021

Macromolecules

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In this work, a sample library of well-defined comblike polystyrenes (PS) has been prepared for the study of average conformation in dilute solutions. The dependences of radius of gyration (R g), intrinsic viscosity ([η]), viscometric radius (R η), and persistence length (l p) on the molar mass (M), grafting density (σ), and degree of polymerization of graft side chains (N g) have been established. First, we have revealed the universal abnormal elution behavior of comblike chains in different size exclusion chromatography (SEC) column systems. A combined theoretical analysis and elution experiment indicates the possible thermodynamic origin, i.e., for chains with the highest stiffness, the anisotropic characteristics and chain end orientation can potentially increase the partition coefficient and retention volume, while the flow-induced forced penetration plays a negligible role. Moreover, the established scalings R η ∼ N g 0.40±0.03σ1/3, R g ∼ (N gσ)0.37±0.01, and l p ∼ σ 0.85±0.09 further indicate that (1) the equivalent viscometric volume is proportional to the mass of individual comblike chains when σ is increased, corresponding to the quasi-3D mass-size growth pattern; (2) the proper consideration of the swelling conformation of side chains is important to capture the essentials of conformational behavior for comblike polymer systems with flexible backbones; and (3) the experimentally established l p–σ dependence by considering the excluded-volume effect is much weaker than the theoretical predictions (l p ∼ σ17/8 and l p ∼ σ7/3). This work provides a comprehensive perspective for understanding the conformational evolution of comblike chains.

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“…With the development of dynamic light scattering (DLS) and viscosity characterization technique, R h and R Z have been widely used to characterize structural features. [102][103][104][105][106][107] In addition, the characteristic quantity, i.e., shape factor (R g /R h ) is also used to characterize the trend of the conformational characteristics of the comb-like chain. 64 An interesting work worth mentioning is that through experimental measurement and theoretical simulation of linear low-density branched polyethylene, Audus et al fitted the scaling law of R g , R h , [Z] and M as a function of N g and s for a set of comb-like samples.…”

Section: Progress For the Dynamic Property Of Conformation In Solutionmentioning

confidence: 99%

“…With the development of dynamic light scattering (DLS) and viscosity characterization technique, R h and R η have been widely used to characterize structural features. 102–107…”

Section: Progress For the Dynamic Property Of Conformation In Solutionmentioning

confidence: 99%