Compatibility of Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)/Poly(styrene-co-4-chlorostyrene) Blends. 2. Dielectric Study of the Critical Composition Region

Wetton, R.E.; MacKnight, W. J.; Fried, Joel; Karasz, F. E.

doi:10.1021/ma60061a028

Cited by 108 publications

(87 citation statements)

References 1 publication

(1 reference statement)

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“…Although the distribution of local environments engendered by concentration fluctuations should broaden both the mechanical loss modulus peaks and dielectric dispersions relative to those of the neat liquids [23,24,[43][44][45], this effect is seen to make a minor contribution to the measured mech- anical dispersions. This apparent absence of significant inhomogeneous broadening allows direct application of Eq.…”

Section: Methodsmentioning

confidence: 92%

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Santangelo

Roland

Ngai

et al. 1994

Journal of Non-Crystalline Solids

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Dielectric and dynamical mechanical measurements have been performed on mixtures of the small molecule glassforming liquid 1,1-bis(p-methoxyphenyl) cyclohexane (BMC) with poly(methylphenylsiloxane) (PMPS). Earlier measurements had indicated that the BMC dynamics are modified in a very interesting way by the presence of the polymer, despite the equivalence of their glass transition temperatures, Tg. By varying the molecular weight of the polymer (and hence Tg), the BMC mobility is anomalously enhanced in mixtures of high Tg PMPS. An interpretation for these results based on the coupling model of relaxation is suggested.

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Section: Methodsmentioning

confidence: 92%

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Santangelo

Roland

Ngai

et al. 1994

Journal of Non-Crystalline Solids

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“…Extensive studies have been conducted for such miscible blends to examine the dynamics of monomeric segments being related to the glass transition. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Those studies revealed characteristic features of the miscible blends such as the broad (almost two-step) glass transition noted in thermal measurements, the broad modes of segmental motion detected with NMR, and the broad and thermo-rheologically complex relaxation processes observed with the dielectric/viscoelastic methods. These features are related to the self-concentration effect 16 and the local composition fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Dynamics in miscible blends of polyisoprene and poly(p-tert-butyl styrene): thermo–rheological behavior of components

Chen

Watanabe

2011

Polym J

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For miscible blends of moderately entangled cis-polyisoprene (PI) and poly(p-tert-butyl styrene) (PtBS), viscoelastic and dielectric properties were examined over a wide range of temperature (T ) to discuss the thermo-rheological behavior of respective components. Because PI has the type-A dipole, whereas PtBS does not, the slow dielectric response of the blends was exclusively attributed to the global motion of the PI chains therein. In most of the blends examined, the viscoelastic relaxation was much slower than the dielectric relaxation, and PI and PtBS behaved as the fast and much slower components, respectively. In those blends, the PI relaxation was thermo-rheologically complex because the slow PtBS chains quenched the dynamic frictional heterogeneity in the time scale of the PI relaxation. In contrast, the viscoelastic response of PtBS was thermo-rheologically simple because the fast PI chains smeared the heterogeneity for PtBS. Nevertheless, PtBS showed no ordinary relaxation associated with the entanglement plateau but did exhibit Rouse-like relaxation slower than the entanglement-free Rouse process. This slow Rouse-like relaxation was attributed to the pseudo-constraint release mechanism for the PtBS chains activated by the global motion of the PI chains. A simple model based on this molecular picture described the G* data of the blends well.

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“…It is noticed that, the relaxation peak is broader in the blend samples. The distribution of relaxation time of the glass relaxation process for many blends was strongly influenced by blending [34]. Blending leads to broader α-relax ation peak than that achieved in the pure components.…”

Section: Miscibility Study Based On Tg Analysismentioning

confidence: 99%

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

Hanafy¹

2013

AMPC

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The miscibility of chlorinated poly vinyl chloride (CPVC) and poly ethylene glycol (PEG) or poly ethylene succinate (PES) had been investigated using dielectric relaxation spectroscopy (DRS) over frequency and temperature ranges; 10 kHz -4 MHz and 300 -450 K, respectively. Three relaxation processes namely ρ-, α'-, and α-relaxation processes were observed for tan(δ) and the electric modulus M" of pure components and blends. The first one was attributed to the space charge polarization or the Maxwell-Wagner polarization. The second one was related to the amorphous regions located between the lamellar crystal stacks. The third one was due to the micro-Brownian motion of CPVC main chains. This process was found to be dependent in respect of temperature and frequency. The molecular dynamics of α-relaxation process were influenced by blending, i.e., the dielectric strength (Δε), the peak broadness, and the peak maximum of tan(δ) were found to be compositional dependent. Electric modulus analysis reveals that there is a role of electrode polarization for the dielectric relaxation.

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Compatibility of Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)/Poly(styrene-co-4-chlorostyrene) Blends. 2. Dielectric Study of the Critical Composition Region

Cited by 108 publications

References 1 publication

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Dynamics in miscible blends of polyisoprene and poly(p-tert-butyl styrene): thermo–rheological behavior of components

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

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