Studies of phase separated copolymer blends using thermally stimulated currents and dielectric spectroscopy

Sauer, Bryan B.; Avakian, P.; Cohen, Gordon M.

doi:10.1016/0032-3861(92)90436-z

Cited by 16 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the temperature dependence of the dielectric loss at 500 kHz, the sample containing 80 phr IC shows an α‐relaxation peak at −20°C, while the sample containing 80 phr AMS shows a much broader α‐relaxation at slightly higher temperatures. The high frequency enhances the spatial resolution for processes taking place on small molecular length scales of a few nm 43–46 . Thus, the concentration fluctuation responsible for the broadening of the α‐relaxation predominantly takes place on a small length scale.…”

Section: Resultsmentioning

confidence: 99%

Rigidity of plasticizers and their miscibility in silica‐filled polybutadiene rubber by broadband dielectric spectroscopy

Lindemann

Finger

Karimi–Varzaneh

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

An efficient use of plasticizers in rubber compounds requires an understanding of their miscibility behavior. Besides the chemical properties of both rubber and plasticizer, the rigidity of the plasticizer plays an important role for their miscibility. The miscibility is investigated here using the glass transition measured by differential scanning calorimetry and broadband dielectric spectroscopy (BDS). Additionally, the interfacial relaxation and phase separation measured by BDS are confirmed by transmission electron microscopy. While the flexible plasticizer, poly-(α-methylstyrene), stays miscible in a silica-filled polybutadiene rubber compound, the more rigid plasticizer, indenecoumarone (IC), shows a phase separation at high concentrations. The phaseseparated IC tends to accumulate at the silica surface.

show abstract

Section: Resultsmentioning

confidence: 99%

Rigidity of plasticizers and their miscibility in silica‐filled polybutadiene rubber by broadband dielectric spectroscopy

Lindemann

Finger

Karimi–Varzaneh

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Techniques, such as Broadband Dielectric Spectroscopy (BDS) and Nuclear Magnetic Resonance (NMR) Spectroscopy, have a much broader operation frequency ranging from 10 −2 to 10 Hz. This allows detecting a broader range of molecular length scales from less than 1 nm (approximate length scale of a monomer) to almost 100 nm (approximate length scale of a whole polymer chain) . It might therefore be possible to identify the relaxation times related to either component/blended chains in miscible blends.…”

Section: Introductionmentioning

confidence: 99%

“…This allows detecting a broader range of molecular length scales from less than 1 nm (approximate length scale of a monomer) to almost 100 nm (approximate length scale of a whole polymer chain). [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] It might therefore be possible to identify the relaxation times related to either component/blended chains in miscible blends. This possibility was already described in literature as "Concentration Fluctuations (CF)" that can be identified by local variations in relaxation times around an average value in the length scale of approximately 3 nm.…”

Section: Introductionmentioning

confidence: 99%

Identifying the effect of aromatic oil on the individual component dynamics of S‐SBR/BR blends by broadband dielectric spectroscopy

Rathi

Hernández

Garcia

et al. 2018

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Miscible S‐SBR (solution styrene–butadiene copolymer)/BR (polybutadiene homopolymer) blends are used in multiple applications like modern passenger car tire treads. Despite their miscibility, there is a problem to predict tire performance due to dynamical heterogeneities present in the S‐SBR/BR blends. On the one hand, S‐SBR/BR blends have a thermorheologically complex behavior, which complicates the prediction of the temperature‐ and frequency‐dependence of material properties. On the other hand, due to differences in the polarity of the individual components, the extender oils used in the elastomeric compounds could distribute unequally within the blends, where little is known about how oils interact with the two polymers. In this work a combination of Differential Scanning Calorimetry, Dynamic Mechanical Analysis, and Broadband Dielectric Spectroscopy (BDS) is used to clarify: (i) the thermorheological complexity of S‐SBR/BR blends, (ii) the effect of the extender oil on the blend. The broad frequency operation of BDS allows for the analysis of the S‐SBR and BR component dynamics and the effect of the oil on each of them within an S‐SBR/BR (50/50) blend. Based on the discretization of individual component dynamics in the blend, conclusive remarks are made on the effect of the extender oil for either component in the blend. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 842–854

show abstract

“…Thus, blending of polymers is an effective way of producing advanced multicomponent polymeric systems with new property profiles. 4,5 Ethylene-co-vinyl acetate (EVA)-based blends generally have an additional conducting polymer that improves their mechanical properties. Electrical conduction is conduction of complex polymer blend in and strongly dependent on the arrangement of conducting component in the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, blending of polymers is an effective way of producing advanced multicomponent polymeric systems with new property profiles. 4,5…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of conductive polypyrrole/ethylene vinyl acetate copolymer blends

Shokr

Al-Gahtany

2013

Journal of Elastomers & Plastics

View full text Add to dashboard Cite

Polymer blends of polypyrrole (PPy)-conducting particles dispersed in poly(ethyleneco-vinyl acetate) (EVA) matrix were prepared. The dielectric properties were determined, and we have examined how these properties depend on the relative concentration of the conducting (PPy) and dielectric (EVA) blends. The dielectric constant increases appreciably by increasing the PPy contents in the blend matrix. A previous proposed model by Tsangaris et al, for the calculation of effective dielectric constant, was tested and approaches the experimental values more closely for low PPy contents.

show abstract

Studies of phase separated copolymer blends using thermally stimulated currents and dielectric spectroscopy

Cited by 16 publications

References 21 publications

Rigidity of plasticizers and their miscibility in silica‐filled polybutadiene rubber by broadband dielectric spectroscopy

Rigidity of plasticizers and their miscibility in silica‐filled polybutadiene rubber by broadband dielectric spectroscopy

Identifying the effect of aromatic oil on the individual component dynamics of S‐SBR/BR blends by broadband dielectric spectroscopy

Dielectric properties of conductive polypyrrole/ethylene vinyl acetate copolymer blends

Contact Info

Product

Resources

About