Viscoelastic properties of dilute polymer solutions

Ferry, John D.

doi:10.1351/pac197850040299

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…However, in the case of native xanthan gum K25 a plateau area can be clearly recognized, whereas it completely disappears for the degraded samples. For xanthan gum S5, a change in the storage modulus is found at x 1.8 , i. e. very close to the quadratic dependence for ideal coil and rigid rod 46) .…”

Section: Elastic Behavioursupporting

confidence: 58%

Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Arendt

Kulicke

1998

Angew. Makromol. Chem.

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Section: Elastic Behavioursupporting

confidence: 58%

Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Arendt

Kulicke

1998

Angew. Makromol. Chem.

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“…The glass transition temperature (T g ) is defined by the local maximum in loss modulus representing the relaxation process typically probed at a frequency of 1.0 rad/s, [51] while the local maximum in tan(δ) (i.e. the ratio of E"/E' or G"/G') usually gives higher T g values.…”

Section: Glass Transitionmentioning

confidence: 99%

Connecting the Mechanical and Conductive Properties of Conjugated Polymers

Xie

Colby

Gomez

2017

Adv Elect Materials

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Both the mechanical deformability and electronic conductivity of conjugated polymers play important roles in the development of wearable and stretchable electronics. Despite the recent progress and emphasis on achieving highly stretchable and conductive devices, the correlation This article is protected by copyright. All rights reserved. 2 between the mechanical and conductive properties is poorly understood and remains mostly empirical. The future of flexible electronics relies on the ability to predict and tune the mechanical and conductive properties such that the molecular design of conjugated polymers can be optimized for various applications. Instead of seeking a direct correlation between mechanical and conductive properties, this Progress Report proposes to examine the common microstructural origin for mechanical performance and charge transport in conjugated polymers. Measurements of microstructural information, such as persistence length, chain entanglement, glass transition, liquid crystalline phase transition, and intercrystalline morphology, are desperately needed in the field of conjugated polymers in order to establish connections with both the mechanical/conductive properties and the chemical structures. Conventional experimental methods in the field of flexible polymer physics, such as linear viscoelastic rheometry, open up new avenues for characterizing these microstructural parameters, thereby providing a path towards predicting and designing the molecular structure of conjugated polymers with desired mechanical and conductive properties.

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“…Measurements of the dilute solution viscoelastic properties for a wide variety of macromolecules have been performed in recent years in this laboratory (Ferry, 1978(Ferry, , 1980. Information about the shape and the dynamics of macromolecules can be obtained from the frequency dependence of the complex shear modulus (or, equivalently, the complex viscosity).…”

mentioning

confidence: 99%

Flexibility of myosin rod determined from dilute solution viscoelastic measurements

Hvidt¹,

Nestler²,

Greaser³

et al. 1982

Biochemistry

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The frequency dependencies of the storage and loss shear moduli, G' and G", of myosin rod solutions at 1.0 and 7.0 degrees C were measured by use of the Birnboim-Schrag multiple lumped resonator apparatus in solvents with and without glycerol. The infinite dilution moduli were determined and compared with theoretical models for a rigid rod and a freely jointed trinodular rod and with an empirical model for a semiflexible rod. Only the latter could fit the data. A rotational relaxation time of 25 mus and a slowest bending time of 3.1 mus, both reduced to water at 20 degrees C, were determined from the fit. A persistence length of about 130 nm was obtained from either the bending time, the rotational relaxation time, or the intrinsic viscosity. The average thermal excursion of the end of subfragment 2 was estimated to be 26 nm, more than sufficient to span the gap between the thick and thin filaments in muscles at all sarcomere lengths. Thus, a hinge between heavy meromyosin and light meromyosin does not appear necessary for myosin-actin contact. Young's modulus of about 1 x 10(9) N/m2 also makes it unlikely that subfragment 2 can be the elastic element in the Huxley-Simmons model of muscle contraction.

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Viscoelastic properties of dilute polymer solutions

Cited by 11 publications

References 22 publications

Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Connecting the Mechanical and Conductive Properties of Conjugated Polymers

Flexibility of myosin rod determined from dilute solution viscoelastic measurements

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