2000
DOI: 10.1021/ma9911243
|View full text |Cite
|
Sign up to set email alerts
|

Molecular Dynamics in Cyanate Ester Resin Networks and Model Cyanurate Compounds

Abstract: Molecular dynamics via broad-band dielectric relaxation spectroscopy (DRS) are obtained on a class 3 network-forming system: a generic cyanate ester resin. The potential for in-situ monitoring of the network-forming reaction is explored. The segmental dynamics of the growing network are investigated, and a hitherto unknown secondary relaxation process, β*, is found. This relaxation is distinctly different from the Johari-Goldstein slow β process. Model compounds and conformational strain analysis are used to e… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1

Citation Types

2
11
0

Year Published

2005
2005
2023
2023

Publication Types

Select...
9

Relationship

0
9

Authors

Journals

citations
Cited by 27 publications
(13 citation statements)
references
References 45 publications
2
11
0
Order By: Relevance
“…The interdigitated electrode experiment also provides a rough estimate of the dielectric constant, subject to significant uncertainty due to electrode blocking and other interfacial effects. 53 The estimate for the dielectric constant of PFCBCy using this approach was roughly 2, which is in general agreement with values for fluorinated macromolecular networks and thermoplastics. A check of repeatability using Primaset LECy showed a standard deviation of around 1.0 for the variation in the dielectric constant as determined by this technique, as expected based on the aforementioned limitations.…”
supporting
confidence: 81%
See 1 more Smart Citation
“…The interdigitated electrode experiment also provides a rough estimate of the dielectric constant, subject to significant uncertainty due to electrode blocking and other interfacial effects. 53 The estimate for the dielectric constant of PFCBCy using this approach was roughly 2, which is in general agreement with values for fluorinated macromolecular networks and thermoplastics. A check of repeatability using Primaset LECy showed a standard deviation of around 1.0 for the variation in the dielectric constant as determined by this technique, as expected based on the aforementioned limitations.…”
supporting
confidence: 81%
“…The interdigitated electrode experiment also provides a rough estimate of the dielectric constant, subject to significant uncertainty due to electrode blocking and other interfacial effects . The estimate for the dielectric constant of PFCBCy using this approach was roughly 2, which is in general agreement with values for fluorinated macromolecular networks and thermoplastics.…”
supporting
confidence: 61%
“…This result is consistent with the current knowledge about the effect of cross-linking on the glass transition of polymer systems. Such a broadening effect has been reported in a number of publications that examine the dielectric relaxation spectra of polymers with different degrees of cross-linking. Roland related high cross-link densities to an increase in intermolecular cooperativity, resulting in a broader distribution of the relaxation spectra (for a discussion on intermolecular cooperativity and its effects on relaxation spectra see also).…”
Section: Discussionmentioning
confidence: 60%
“…The intensity, (tan d) max , and the broadness of the a-transition are sensitive to the amplitude and homogeneity of the macromolecular chain motions, respectively [14]. In other words, restrictive chain motion causes the reduction of damping capability, intensity decrement, whereas raising the heterogeneity of the chain local environment leads to wider relaxation spectra, which imply relaxation broadening [14][15][16][17][18] (Fig. 1).…”
Section: Resultsmentioning
confidence: 99%