The temperature dependence of intermolecular interaction in polymers in the glassy state

Bershteĭn, V. A.; Petkevich, M.Z.; Razgulyayeva, L.G.; Stepanov, V. A.

doi:10.1016/0032-3950(78)90514-2

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…First, at higher temperatures, chain mobility within the polymer system is enhanced. Thus, free volume between the molecules increases, leading to reduced intermolecular interactions 50,51 . As a result, dipoles are less restricted and can rotate more freely, enhancing polarization within the external field.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, free volume between the molecules increases, leading to reduced intermolecular interactions. 50,51 As a result, dipoles are less restricted and can rotate more freely, enhancing polarization within the external field. Contrary, increased motion of dipoles leads to less perfect orientation due to higher temperature-induced fluctuations, reducing the average alignment and therefore ε 0 r .…”

Section: Dielectric Properties Of the Polymersmentioning

confidence: 99%

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Influence of dielectric properties of polybutylene terephthalate and respective foam beads on process behavior in radio‐frequency welding

Dippold,

Töpfer,

Ruckdäschel

2023

J of Applied Polymer Sci

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Radio‐frequency welding shows great potential for a more sustainable manufacturing of lightweight bead foam products based on local dielectric heating of the part. This study provides the first insight into the material‐process interactions required to enable interdiffusion between foam particles and thus adhesion. The complex relative permittivity is analyzed by impedance spectroscopy of the bulk polymer and foam beads using specially designed measurement cells. Due to the increased flexibility of the polymer chains at elevated temperatures, the relaxation mechanisms are promoted, resulting in a shift of the curves to higher frequencies. At a fixed frequency, a peak in the imaginary part is observed above temperature, revealing the superposition of these two parameters. The foamed beads show similar trends with an attenuated signal due to the high volumetric fraction of air within the multiphase system. The linear dependence between and volumetric power as direct process feedback due to dielectric heating was observed during welding. Compared to the delayed signals from the shielded temperature sensors, the analysis of power consumption allows for higher quality real‐time monitoring throughout the process cycle. The correlation also allows prediction of power levels at defined temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Properties Of the Polymersmentioning

confidence: 99%

Influence of dielectric properties of polybutylene terephthalate and respective foam beads on process behavior in radio‐frequency welding

Dippold,

Töpfer,

Ruckdäschel

2023

J of Applied Polymer Sci

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“…The heating of PDNP surface changes the nature of PDNPdrug intermolecular interactions. 28,29 For both loading methods, the impact of this heating in the kinetics of Chl release is greater than that of Tet release (Fig. 8).…”

Section: Structure Of Loaded Drug Affects Laser-enhanced Drug Releasementioning

confidence: 95%

Different drug loading methods and antibiotic structure modulate the efficacy of polydopamine nanoparticles as drug nanocarriers

Patel,

Andoy,

Tran

et al. 2023

J. Mater. Chem. B

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Kinetics of Deformation and Intermolecular Forces in Polymers

1980

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The temperature dependence of intermolecular interaction in polymers in the glassy state

Cited by 10 publications

References 8 publications

Influence of dielectric properties of polybutylene terephthalate and respective foam beads on process behavior in radio‐frequency welding

Influence of dielectric properties of polybutylene terephthalate and respective foam beads on process behavior in radio‐frequency welding

Different drug loading methods and antibiotic structure modulate the efficacy of polydopamine nanoparticles as drug nanocarriers

Kinetics of Deformation and Intermolecular Forces in Polymers

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