Simultaneous dynamic mechanical analysis and dielectric analysis of polymers

Shepard, David D.; Twombly, B.

doi:10.1016/0040-6031(95)02622-3

Cited by 38 publications

(25 citation statements)

References 2 publications

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“…DEA is based on the study of the electrical response of a polymer, and dielectric cure monitoring is sensitive to the mobility of ions and the rotational mobility of dipole on the polymer molecule in the presence of an electric field. The important information that can be obtained by DEA includes relative viscosity change, cure rate, cure state, and the end of cure,19, 20 in which, the dielectric loss factor (ε″) can be used to determine the degree of cure 21…”

Section: Resultsmentioning

confidence: 99%

The effect of epoxy resin to reduce the compression set of polysulfide sealant

Zhang¹,

Wang²,

Ding³

et al. 2011

J of Applied Polymer Sci

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In this article, modified polysulfide sealants with lower compression set were prepared by a simple method of introducing the diglycidyl ether of bisphenol A resin (DGEBA epoxy resin) into sealants. The investigation on reactivity analysis and gel faction test verified that the incorporation of epoxy resin in sealants was just a blending process rather than copolyaddition with polysulfide resin. Stress–strain behavior during compression revealed that the epoxy resin could reduce the compression stress when the sealants were loaded to a certain strain, which effectively lessened crosslink breakages and benefited to compression resistance. Also the rigid phenyl structure in epoxy resin may retard incidental slide between polysulfide chains and prevent interchange reactions between disulfide linkages. The incorporation of 2 phr epoxy resin distinctly reduced compression set of polysulfide sealant from 28.3% to 11.2% after compressed 25% at 23°C for 1 day. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 99%

The effect of epoxy resin to reduce the compression set of polysulfide sealant

Zhang¹,

Wang²,

Ding³

et al. 2011

J of Applied Polymer Sci

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“…In general, dielectric permittivity and loss factor of the insulating materials depend upon the applied voltage, frequency and temperature [7]. In this research, the permittivity, loss factor and tan d measurements were carried out for nonirradiated and 400, 800, 1200, 1600, 2000 kGy irradiated EPR at various frequencies from À150 to 50 8C of temperature ranges.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Radiation effects on dielectric properties of ethylene propylene rubber

Lee

2008

Journal of Industrial and Engineering Chemistry

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“…This correlation allows probing the chemistry, flow and molecular mobility (relaxations) of polymers and composites which is related to processing and morphology of polymer composites (Shepard and Twombly 1996). Moreover, dielectric analysis is also important in the development of electrode and electrolyte materials for solid state electrochemical devices such as batteries, sensors, fuel cells, super capacitors and electrochromics as well as in the development of microelectronic packaging materials for performance optimization of high frequency devices (Raja et al 2004).…”

Section: Introductionmentioning

confidence: 98%

“…The dielectric parameters are important by themselves but become more significant when correlated to activity on a molecular level since chemical structure, polarity and interaction of molecules determine the ability of dipoles to respond to electromagnetic field (Shepard and Twombly 1996;Campbell et al 2001). This correlation allows probing the chemistry, flow and molecular mobility (relaxations) of polymers and composites which is related to processing and morphology of polymer composites (Shepard and Twombly 1996).…”

Section: Introductionmentioning

confidence: 99%

Effect of ion beam irradiation on metal particle doped polymer composites

et al. 2011

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Polymethyl methacrylate (PMMA) was prepared by solution polymerization method. Different concentrations (10, 20 and 40%) of Ni powder were dispersed in PMMA and the composite films were prepared by casting method. These films were irradiated with 120 MeV Ni 10+ ions at a fluence of 5 × 10 12 ions/cm 2 . Electrical, structural and chemical properties of the composites were studied by means of an LCR meter, X-ray diffraction, FTIR spectroscopy and SEM/AFM, respectively. The results showed that the conductivity increases with metal concentration and also with ion beam irradiation. This reveals that ion beam irradiation promotes the metal/polymer bonding and converts polymeric structure into hydrogen depleted carbon network. It was observed from XRD analysis that percentage crystallinity and crystalline size decrease upon irradiation. This might be attributed to rupture of some polymeric bonds, which is also corroborated with FTIR spectroscopic analysis. Ion beam tempts graphitization of polymeric material by emission of hydrogen and/or other volatile gases. Surface morphology of the pristine and irradiated films was studied by atomic force microscopy (AFM)/scanning electron microscopy (SEM). Result showed that the surface roughness increases after ion beam irradiation.

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Simultaneous dynamic mechanical analysis and dielectric analysis of polymers

Cited by 38 publications

References 2 publications

The effect of epoxy resin to reduce the compression set of polysulfide sealant

The effect of epoxy resin to reduce the compression set of polysulfide sealant

Radiation effects on dielectric properties of ethylene propylene rubber

Effect of ion beam irradiation on metal particle doped polymer composites

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