Direct observation of two glass transitions in silica-filled polymers. Implications to the morphology of random ionomers

Tsagaropoulos, George; Eisenburg, Adi

doi:10.1021/ma00105a059

Cited by 207 publications

(190 citation statements)

References 3 publications

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“…The relaxation time was mainly measured using dielectric spectroscopy [183,184], NMR spectroscopy [185][186][187][188][189][190][191][192], and neutron scattering [193,194]. T g was determined using dynamic mechanical spectroscopy [195][196][197][198][199], calorimetry [191,[200][201][202], and dilatometry [184,203] techniques. Since the mobility of the polymer chains around the fillers is related to the interfacial interaction, the presence of the interaction and their strength can be estimated by measuring T g and relaxation time [11,204].…”

Section: Glass Transition (T G )mentioning

confidence: 99%

“…If the interaction between the fillers and surrounding matrix is the same as the interfacial interaction between ultrathin layer of the bulk polymer and the substrate, T g will be invariant [204]. Additionally, it was reported that there may be more than one T g in polymer nanocomposites with strong interactions between the fillers and polymer chains [196]. In that case, higher T g belongs to the regions adjacent to the fillers with irreversible adsorption of polymer chains to the particles, while the lower T g represents for the polymer bulk farther from the fillers [182].…”

Section: Glass Transition (T G )mentioning

confidence: 99%

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A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Kashfipour

Mehra

Zhu

2018

Adv Compos Hybrid Mater

161

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Composite materials and especially polymer composites are widely used in daily life and different industries due to their vastly different properties and design flexibility. It is known that the properties of the composites are strongly related to the properties of its constituents. However, it has been reported in many studies, experimentally and by simulations, that the characteristics of the composites do not follow the rule of mixing. It means that in addition to properties of the constituents, there are other parameters affecting the final physicochemical properties of composites. The interfacial interactions between fillers and host is one of the factors which can strongly affect the properties of the composite. In this review, we summarized the type of interactions between the constituents, their improvement techniques, interaction measurement methods, and the effects of interfacial interactions on thermal, mechanical, and electrical properties of composites.

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Section: Glass Transition (T G )mentioning

confidence: 99%

Section: Glass Transition (T G )mentioning

confidence: 99%

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Kashfipour

Mehra

Zhu

2018

Adv Compos Hybrid Mater

161

View full text Add to dashboard Cite

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“…Dynamic mechanical testing is a common technique to study the effect of particles on the T g of polymers, [11][12][13][14][15][16][17][18][19][20][21][22][23] and a summary of these studies is given in Table I. Many investigators draw conclusions based on the temperature of the maximum in the isochronal loss tangent, tanδ = G"/G' (abbreviations are defined in the appendix).…”

Section: Dynamic Mechanical Spectroscopymentioning

confidence: 99%

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Robertson

Roland

2008

Rubber Chemistry and Technology

152

125

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We review the literature concerned with the effect of proximity to a filler surface on the local segmental mobility of polymer chains. This mobility is commonly assessed from either the glass transition temperature, Tg, or the segmental relaxation times measured by mechanical, dielectric, or NMR spectroscopy. Published studies report increases, decreases, or no change in Tg upon the addition of carbon black, silica, and other reinforcing fillers. Similarly, the segmental relaxation times have been found to increase or be invariant to the presence of nanometer-sized particles. Some of these discrepancies can be ascribed to ambiguous methods of data analysis; others likely reflect the variation in filler-polymer interaction among different systems. There are unequivocal examples of polymers that have segmental dynamics and glass transitions unaffected by nano-particle reinforcement. However, the general principles governing the behavior remain to be clarified, with further work, focusing on the micromechanics at the particle interface, required for resolution of this important aspect of rubber science and technology.

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“…[2,11] It was also reported that strong particle surface interaction with the surrounding polymer chains can lower the mobility of the polymer near the particle surface which might lead to a reduced permeability [17][18][19] and changes in the glass transition behavior. [20] On the other hand, it was also suggested that in case of very weak interaction between particle surface and polymer segments the mobility of the chains may increase near those surfaces. [21] This might lead to an increase in permeation in these regions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Oxygen Permeation through Composites of PMMA and Surface‐Modified ZnO Nanoparticles

Heß

Demir

Yakutkin

et al. 2009

Macromol. Rapid Commun.

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Oxygen permeabilities of nanocomposite films consisting of poly(methyl methacrylate) (PMMA) and different amounts of spherical zinc oxide (ZnO) nanoparticles were determined to investigate the barrier effect of this material with respect to particle content. A method was applied which is based on quenching of an excited phosphorescent dye by oxygen. Possible effects of the nanoparticles on the response of the dye molecules were investigated and were ruled out.magnified image

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Direct observation of two glass transitions in silica-filled polymers. Implications to the morphology of random ionomers

Cited by 207 publications

References 3 publications

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Investigation of Oxygen Permeation through Composites of PMMA and Surface‐Modified ZnO Nanoparticles

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