Dielectric analyses of a series of poly(2-hydroxyethyl methacrylate-co-2,3-dihydroxypropyl methacylate) copolymers

Mohomed, K.; Moussy, Francis; Harmon, Julie P.

doi:10.1016/j.polymer.2006.03.099

Cited by 29 publications

(25 citation statements)

References 17 publications

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“…The pure rubbers exhibit two relaxation peaks. The relaxation at higher temperature may be attributed to the conductivity relaxation, according to the literature [30] . The blends present two main relaxation peaks related to the different rubber domains, confirming that the blends are immiscible.…”

Section: Curing Characteristics and Physical-mechanical Propertiesmentioning

confidence: 71%

“…In order to avoid such interferences, many authors use the electrical modulus formalism to describe the relaxation of the dipole that exists in different energy environment, without the effects of the conductivity [30][31] . The complex electric modulus is derived from the complex permittivity, according to the relationship defined by Macedo et al [32] : Figure 6 illustrates the dependence of M" with the temperature for the NBR/ACM blends as a function of the XNBR content.…”

Section: Curing Characteristics and Physical-mechanical Propertiesmentioning

confidence: 99%

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Compatibilization efficiency of carboxylated nitrile rubber and epoxy pre-polymer in nitrile/acrylic rubber blends.

Celestin¹,

Soares²

2013

Polímeros

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An investigation has been made of the effects from a compatibilizer, viz. carboxylated nitrile rubber (XNBR), on several properties of nitrile rubber (NBR) and acrylic rubber (ACM) blends, including curing characteristics, mechanical, dynamic mechanical and dielectric properties. The presence of XNBR until 10 phr resulted in an improvement of the ultimate tensile properties, especially elongation at break. The mechanical properties associated to the volume fraction of rubber in the network (Vr) and torque values suggest the co-vulcanization phenomenon imparted by the compatibilization. The oil resistance of NBR/ACM (50:50 wt. (%)) blends (compatibilized and non compatibilized) was similar to that observed for pure ACM and significantly higher than NBR. The addition of small amounts of epoxy pre-polymer in combination with XNBR resulted in an additional improvement of the tensile properties. The dynamic mechanical and dielectric properties of the blends were also investigated. The loss modulus values of the compatibilized blends were significantly lower indicating an increase of the elastic characteristics. All blends presented two dielectric relaxation peaks confirming the heterogeneity of the compatibilized blends.

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Section: Curing Characteristics and Physical-mechanical Propertiesmentioning

confidence: 71%

Section: Curing Characteristics and Physical-mechanical Propertiesmentioning

confidence: 99%

Compatibilization efficiency of carboxylated nitrile rubber and epoxy pre-polymer in nitrile/acrylic rubber blends.

Celestin¹,

Soares²

2013

Polímeros

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show abstract

“…2) allowed us to observe five relaxation mechanisms. In order of increasing temperature: c-relaxation process is observed in the temperature range of À135 to À60°C, this relaxation masks a very weak relaxation phenomenon in the temperature domain of -100°C/-75°C-so called bsw-relaxation process [35][36][37][38]. As the temperature increases, a b-relaxation mechanism appears displayed in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…2 in the temperature range of À50°C/+25°C. At higher temperature the b-relaxation mechanism is hidden by high conductivity phenomenon and by the starting of an a-relaxation mechanism [35,36]. The a-relaxation process of PHEMA is clearly evidenced only at high frequencies in the temperature range of +50°C/+160°C.…”

Section: Resultsmentioning

confidence: 96%

Semi-interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate): Dielectric study of relaxation behavior

Karabanova¹,

Boiteux²,

Seytre³

et al. 2009

Journal of Non-Crystalline Solids

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“…8 Plots of a dielectric constant (e 0 ) and b dielectric loss (e 00 ) versus frequency comprehensively responsible for the permittivity. The dielectric permittivity of a material, e 0 , represents the amount of dipole alignment and the loss factor, e 00 , measures the energy required to align dipoles or move ions [35]. Also, it arises due to the polarization of molecules and the permittivity increases with polarization.…”

Section: The Dielectric Propertiesmentioning

confidence: 99%

Synthesis, thermal degradation and dielectric properties of poly[2-hydroxy,3-(1-naphthyloxy)propyl methacrylate]

et al. 2016

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2-Hydroxy-3-(1-naphthyloxy)propyl methacrylate (NOPMA) monomer was synthesized from reaction of 2-[(2-naphthyloxy)methyl]oxirane with methacrylic acid in the presence of pyridine. The polymerization of NOPMA was carried out by free radical polymerization method in the presence of AIBN at 60°C. The structure of monomer and polymer was characterized by 1 H-NMR, 13 C-NMR and FT-IR spectroscopy techniques. The glass transition temperature and averagemolecular weights of poly(NOPMA) were measured using differential scanning calorimetry and gel permeation chromatography, respectively. The thermal degradation behavior of poly(NOPMA) has been investigated by FT-IR studies of the partially degraded polymer and thermogravimetry. The cold ring fractions (CRFs) were collected at two different temperatures, initially fraction-1 (CRF 1 ) is from room temperature to 320°C, and the other fraction-2 (CRF 2 ) is from 320 to 500°C. The volatile products of the degradation were trapped at -195°C (in liquid nitrogen). All the fractions were characterized by FT-IR, 1 H and 13 C-NMR spectroscopic techniques, and the cold ring fractions (CRFs) were also characterized by GC-MS. For the degradation of polymer, the major compound between products of CRFs is a-naphthol. The GC-MS, FT-IR and NMR data showed that depolymerization corresponding to monomer was not prominent below 320°C in the thermal degradation of poly(NOPMA). The mode of thermal degradation containing formation of the major products was identified. The dielectric permittivity (e 0 ), the loss factor (e 00 ) and conductivity (r ac ) were measured using a dielectric analyzer in the frequency range of 50 Hz to 20 kHz.

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Dielectric analyses of a series of poly(2-hydroxyethyl methacrylate-co-2,3-dihydroxypropyl methacylate) copolymers

Cited by 29 publications

References 17 publications

Compatibilization efficiency of carboxylated nitrile rubber and epoxy pre-polymer in nitrile/acrylic rubber blends.

Compatibilization efficiency of carboxylated nitrile rubber and epoxy pre-polymer in nitrile/acrylic rubber blends.

Semi-interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate): Dielectric study of relaxation behavior

Synthesis, thermal degradation and dielectric properties of poly[2-hydroxy,3-(1-naphthyloxy)propyl methacrylate]

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