Dynamics of Poly(propylene sulfide) Studied by Dynamic Mechanical Measurements and Dielectric Spectroscopy

Nicol, Erwan; Nicolai, Taco; Durand, Dominique

doi:10.1021/ma990853f

Cited by 30 publications

(48 citation statements)

References 24 publications

(33 reference statements)

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“…As reported in previous studies,, the amorphous PPS0 exhibits a characteristic phase transition process, a rubber–glass state transition, and experiences a disorder–order transition process (cold crystallization) when heated from room temperature, as depicted in Fig. , which shows the DSC heating traces of PPS with various crystallinities obtained a heating rate of 3 °C min −1 .…”

Section: Resultssupporting

confidence: 61%

The glass transition temperature of poly(phenylene sulfide) with various crystallinities

Zhang

et al. 2012

Polymer International

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The glass transition temperature (Tg) of poly(phenylene sulfide) (PPS) with various crystalline fractions has been studied using dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The DSC measurements show that Tg can be observed from the heating curves for the PPS sample with very low crystallinity, and no Tg is observed when the crystallinity is over 8%. DMA indicates that crystallinity has an important effect on molecular chain segment motion of PPS. When the crystallinity, Xc, of PPS is over 38%, there is only one chain segment motion, which mainly results from the crystalline chain vibration; while three different chain segment motions occur for PPS samples with lower crystallinity (Xc < 26%), which are amorphous chain segment motion, crystalline chain segment motion and constrained amorphous chain segment motion. Tg of PPS is mainly caused by the amorphous chain segment motion which is independent of the crystallinity, while the relaxation temperature corresponding to crystalline chain motion shifts to lower temperature as the crystallinity increases. The reduction of the relaxation temperature can be attributed to the disorder‐order transition of amorphous chains for PPS with lower crystallinity. © 2012 Society of Chemical Industry

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Section: Resultssupporting

confidence: 61%

The glass transition temperature of poly(phenylene sulfide) with various crystallinities

Zhang

et al. 2012

Polymer International

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“…In the low temperature range (from −100 to −30°C), one can observe the β II ‐relaxation, which can be ascribed to the phenyl ring flips like in PET. Nicol et al [45, 46] showed experimentally by introducing hydrogen bonding end‐groups in PPS that the energy of β‐relaxation is independent of molar masses and ascribed this process to the conformational changes of chain backbone. In the case of pure PPS which we studied, the maxima of ε″ related to the β II ‐relaxation are hardly seen for the lowest frequencies and activation energy of this process cannot be determined.…”

Section: Resultsmentioning

confidence: 99%

Dielectric properties of polyethylene terephthalate/polyphenylene sulfide/barium titanate nanocomposite for application in electronic industry

Konieczna

Markiewicz

Jurga

2010

Polymer Engineering & Sci

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Polymer/ceramic nanocomposites designed for application as electronic packaging were prepared using corotating twin‐screw extruder. The dielectric properties of the composites made from polyethylene terephthalate (PET), polyphenylene sulfide, and barium titanate were studied as a function of BaTiO3 fraction in the range between 0.75 and 1.5 wt%. Processing parameters were optimized in order to obtain the nanocomposites with appropriate dielectric properties like dielectric permittivity ε′, dielectric losses ε″, and their temperature stability in a wide frequency range. The measurements showed the increase of the dielectric permittivity value ε′ in the composites in comparison to both pure polymers. The dielectric loss factor tgδ of the composites was found to be much smaller than that of the pure PET. The weak influence of the ceramics on the temperature stability of the dielectric properties of the composites was stated. POLYM. ENG. SCI., 50:1613–1619, 2010. © 2010 Society of Plastics Engineers

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“…Crystalline or glassy polysulfides may, therefore, present a slow (because of the slower dynamics of the material) or poorly reproducible (because of the dependency of the mobility on the thermal history of the sample, controlling the free volume or the extent of crystallinity) oxidation behaviour. PPS does not have these drawbacks, being completely amorphous with a very low T g ;169 as a result, the oxidation proceeds smoothly, with a surface mechanism in macroscopic materials (Figure 4) or a bulk one in nanoparticles 170. Furthermore, PPS can be oxidised under biomimetic conditions, that is, with oxidants typically encountered in a biological environment and, also, through the action of oxidising enzymes,171, 172; the relatively low proportion of the PPS aliphatic component (three carbon atoms per sulphur) makes its oxidation products completely water‐soluble already at the level of the oxidation to sulfoxides173.…”

Section: Preparative Strategies For Polysulfidesmentioning

confidence: 99%

Polymers and Sulfur: what are Organic Polysulfides Good For? Preparative Strategies and Biological Applications

Kilcher

Tirelli

2009

Macromol. Rapid Commun.

106

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Sulfur(II)-containing polymers (polysulfides) combine flexible synthetic and processing techniques with a unique responsiveness to oxidants. Here, the polysulfide oxidative sensitivity is put into the biological context of the development of new anti-inflammatory therapies - the development of new anti-inflammatory methodologies, adopted interactions and the minimisation of foreign-body reactions - through the review of 50 years of research on polysulfide synthetic methodologies. Attention is paid to the identification of the most flexible and robust preparative techniques.

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Dynamics of Poly(propylene sulfide) Studied by Dynamic Mechanical Measurements and Dielectric Spectroscopy

Cited by 30 publications

References 24 publications

The glass transition temperature of poly(phenylene sulfide) with various crystallinities

The glass transition temperature of poly(phenylene sulfide) with various crystallinities

Dielectric properties of polyethylene terephthalate/polyphenylene sulfide/barium titanate nanocomposite for application in electronic industry

Polymers and Sulfur: what are Organic Polysulfides Good For? Preparative Strategies and Biological Applications

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