Viscosities of dilute polymer solutions

Moore, W. G.

doi:10.1016/0079-6700(67)90001-9

Cited by 47 publications

(13 citation statements)

References 123 publications

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“…The values of Huggins' constant k H can be used as an index to describe polymer solvent and polymer-polymer interactions [17,18]. The equality of Equations (2) and (3) demands that the k H + k K = 1/2, which has been confirmed in this work.…”

Section: Huggins (K H ) and Kraemer (K K ) Constantssupporting

confidence: 61%

Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Hamidi¹,

Ihekweazu²,

Wiredu³

et al. 2012

ACES

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The intrinsic viscosity [η] of poly(3,5-dimethyl-phenyl-acrylate) (35PDMPA) solutions were evaluated throughout the measurements of the flow times of toluene and polymer solutions by classical Huggins, and Kraemer's methods using a Cannon-Ubbelohde semi-micro-dilution capillary viscometer in a Cannon thermostated water bath at 40˚C ± 0.02˚C. The values of Huggins' constant estimated ranged from 0.2 to 0.4 which were within expectations. The intrinsic viscosities and molecular weight relationship was established with the two-parameter classical models of Staudinger-Mark-HouwinkSakurada and Stockmayer-Fixman. Conformational parameter C ∞ and σ indicated 35PDMPA be semi flexible. Also, the rigidity of 35PDMPA was confirmed by Yamakawa-Fuji wormlike theory modified by Bohdanecký. The molecular parameters were estimated and compared. The results showed that 35PDMPA behaves like a semi-rigid polymer in toluene at 40˚C rather than a random coil flexible macromolecule.

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Section: Huggins (K H ) and Kraemer (K K ) Constantssupporting

confidence: 61%

Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Hamidi¹,

Ihekweazu²,

Wiredu³

et al. 2012

ACES

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“…Since the s/s PCMs are mainly composed of PEG, it is assumed that the [ η ] must take its value in the same range. It is also reported that k generally takes its value between 0.3 and 0.5 [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

“…The variations of the Huggins constant k were previously studied [ 39 , 44 , 45 ]. This parameter is reported to be solvent and temperature-dependent.…”

Section: Resultsmentioning

confidence: 99%

Rheological Behaviour of Cementitious Materials Incorporating Solid–Solid Phase Change Materials

et al. 2021

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Nowadays, thermal regulation of the indoor environment is mandatory to reduce greenhouse gas emissions. The incorporation of Phase Change Materials (PCMs) and especially solid–solid PCMs (s/s PCMs) into building materials can be a major step forward in reducing energy consumption. Such materials are used for their high latent heat to save and release heat during phase change. To integrate these products in the fabrication of cementitious materials, it is essential to predict their influence on the rheological behaviour of construction materials. In this work, rheological measurements were carried out on composite suspensions made of cement or mortar plus s/s PCMs. Results showed that the fitting of the Herschel–Bulkley model with a constant value of flow exponent was reliable. The s/s PCMs influenced the consistency and the yield strength values, with the yield strength value being only slightly affected. The adaptation of an existing viscosity model is proposed to predict the consistency value of suspensions. Finally, an innovative approach to predict the flow behaviour is proposed and we highlight the research needs to mainstream the use of s/s PCMs in construction materials.

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“…There is good reason for that to hold true here. The Huggins constant is a dimensionless constant indicative, among other things, of the hydrodynamic interactions of separate polymer chains in a particular solution; it decreases with higher solvent quality or decreased probability of entanglement (26,27). In our case, DNA chains are kept apart and complete rotational motions are prohibited since the molecules are anchored on the protein substrate.…”

Section: Model Analysismentioning

confidence: 95%

Quantitative Determination of Size and Shape of Surface-Bound DNA Using an Acoustic Wave Sensor

Tsortos

Papadakis

Mitsakakis

et al. 2008

Biophysical Journal

117

158

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DNA bending plays a significant role in many biological processes, such as gene regulation, DNA replication, and chromosomal packing. Understanding how such processes take place and how they can, in turn, be regulated by artificial agents for individual oriented therapies is of importance to both biology and medicine. In this work, we describe the application of an acoustic wave device for characterizing the conformation of DNA molecules tethered to the device surface via a biotin-neutravidin interaction. The acoustic energy dissipation per unit mass observed upon DNA binding is directly related to DNA intrinsic viscosity, providing quantitative information on the size and shape of the tethered molecules. The validity of the above approach was verified by showing that the predesigned geometries of model double-stranded and triple-helix DNA molecules could be quantitatively distinguished: the resolution of the acoustic measurements is sufficient to allow discrimination between same size DNA carrying a bent at different positions along the chain. Furthermore, the significance of this analysis to the study of biologically relevant systems is shown during the evaluation of DNA conformational change upon protein (histone) binding.

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Viscosities of dilute polymer solutions

Cited by 47 publications

References 123 publications

Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Effects of Side-Chain on Conformational Characteristics of Poly(3,5-Dimethyl-Phenyl Acrylate) in Toluene at 40℃

Rheological Behaviour of Cementitious Materials Incorporating Solid–Solid Phase Change Materials

Quantitative Determination of Size and Shape of Surface-Bound DNA Using an Acoustic Wave Sensor

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