Isolating the mobility and characterizing the effect of crosslink structure versus the monomer state using ion time of flight

Krouse, D.; Guo, Zhao‐Xia; Kranbuehl, David E.

doi:10.1016/j.jnoncrysol.2005.03.053

Cited by 4 publications

(3 citation statements)

References 20 publications

(22 reference statements)

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“…The results showed that ion mobility is the parameter that best correlates with the viscosity, both with changes in temperature and network growth. 67 Therefore, the σ DC , displayed in Figure 10 B, can be considered to analyze whether the molecular exchange mechanism in a covalent adaptable network is of dissociative or associative origin when BDS is used.…”

Section: Resultsmentioning

confidence: 99%

“…Krouse et al measured the two components of the conductivity, namely, the ion mobility and the number of mobile charge carriers, in an epoxy/amine formulation before and during the curing process over a similar range of viscosity through ion time-of-flight and dielectric measurements. The results showed that ion mobility is the parameter that best correlates with the viscosity, both with changes in temperature and network growth . Therefore, the σ DC , displayed in Figure B, can be considered to analyze whether the molecular exchange mechanism in a covalent adaptable network is of dissociative or associative origin when BDS is used.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy

Pascual-Jose

Flor

Serra

et al. 2023

ACS Appl. Polym. Mater.

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The dielectric spectra of the poly(thiourethane) network, HDI-S3, have been analyzed to know the nature and the cooperativity of each of the six dielectric processes observed. At low temperatures, γ1, γ2, and β dielectric relaxations were attributed to noncooperative local motions in the glassy state, in which apparent activation energies are 30, 36, and 60 kJ·mol–1, respectively. At higher temperatures, three dielectric relaxations are observed (αTg, α*, ρ). The αTg relaxation is attributed to the glass transition, and it is overlapped with the α* relaxation. The molecular origin of α* relaxation is associated with the bond exchange reaction. Finally, the ρ relaxation is ascribed to the heterogeneity of the sample although its origin is uncertain. The DC conductivity (σDC) is found to be an appropriate variable to analyze the bond exchange reaction. Accordingly, the HDI-S3 has a molecular exchange mechanism of dissociative nature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy

Pascual-Jose

Flor

Serra

et al. 2023

ACS Appl. Polym. Mater.

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“…The assumptions of ion radius and diffusion constant are based on the typical values of ion mobility reported in the literature for epoxy/amine systems. The ion mobility is of the order of 10 −6.2 cm 2 N −1 s −1 for viscosities in the range 0.05-0.1 Pa s [19]. The well-known Einstein relationship between ion mobility, µ, and ion diffusion constant, D is given by…”

Section: Finite Element Analysismentioning

confidence: 99%

The effect of electrostatic and electrohydrodynamic forces on the chaining of carbon nanofibres in liquid epoxy

Sharma

Bakis

Wang

2010

J. Phys. D: Appl. Phys.

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The formation of chains of aligned carbon nanofibres (CNFs) in polymers is a subject of great interest in the field of multifunctional nanocomposites. The mechanism of CNF chain assembly and growth in a low viscosity epoxy is investigated by developing a finite element model of a chain attached to an electrode. The model examines the combined effects of electrostatic and electrohydrodynamic forces on chain morphology. The electrohydrodynamic forces are modelled using the theory of ac electro-osmosis. The predictions of the model are supported by experimental results. The experiments were conducted on a CNF/epoxy/amine mixture by applying an ac field at frequencies ranging from 100 to 100 000 Hz. The predictions of the model qualitatively capture the variations of chain morphology and growth rate as functions of ac frequency. Higher frequencies promote a more uniform and denser network of chains. The rate of growth of chains is highest at an intermediate frequency. A uniform network of chains was observed at frequencies of 1 kHz and greater in the experiments. The rate of growth of chains was maximized at a frequency of 1 kHz for a liquid viscosity of 0.03 Pa s.

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Dielectric Analysis (DEA)

Vassilikou‐Dova

Kalogeras

2008

Thermal Analysis of Polymers

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Isolating the mobility and characterizing the effect of crosslink structure versus the monomer state using ion time of flight

Cited by 4 publications

References 20 publications

Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy

Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy

The effect of electrostatic and electrohydrodynamic forces on the chaining of carbon nanofibres in liquid epoxy

Dielectric Analysis (DEA)

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