Water-driven segmental cooperativity in polyvinyl butyral

Carini, G.; Bartolotta, A.; Carini, G.; D’Angelo, Giovanna; Federico, M.; Marco, G. Di

doi:10.1016/j.eurpolymj.2017.11.016

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The TGA profile of PVB ( Figure 6a) is similar to that reported for Butvar B90 ® in similar conditions [45]. The 2.3% weight loss below 100 • C, shown in the inset, is due to water desorption [46]. This process was shifted to higher temperatures in the composites and was completed by 120 • C. For the main degradation process, the temperature of the maximum degradation rate, T max , obtained from the TG derivative profile, dTG, was 376 • C for PVB.…”

Section: Thermal Degradation Of the Pvb-ato Nanocompositessupporting

confidence: 77%

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

et al. 2019

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Films made of poly(vinyl butyral) (PVB) and antimony-doped tin oxide (ATO) nanoparticles (NPs), both uncoated and surface-modified with an alkoxysilane, were prepared by solution casting at filler volume fractions ranging from 0.08% to 4.5%. The films were characterized by standard techniques including transmission electron microscopy, thermogravimetric analysis and differential scanning calorimetry (DSC). In the polymeric matrix, the primary NPs (diameter ~10 nm) aggregate exhibiting different morphologies depending on the presence of the surface coating. Coated ATO NPs form spherical particles (with a diameter of 300–500 nm), whereas more elongated fractal structures (with a thickness of ~250 nm and length of tens of micrometers) are formed by uncoated NPs. The fraction of the polymer interacting with the NPs is always negligible. In agreement with this finding, DSC data did not reveal any rigid interface and 1H time domain nuclear magnetic resonance (NMR) and fast field-cycling NMR did not show significant differences in polymer dynamics among the different samples. The ultraviolet-visible-near infrared (UV-Vis-NIR) transmittance of the films decreased compared to pure PVB, especially in the NIR range. The solar direct transmittance and the light transmittance were extracted from the spectra according to CEN EN 410/2011 in order to test the performance of our films as plastic layers in laminated glass for glazing.

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Section: Thermal Degradation Of the Pvb-ato Nanocompositessupporting

confidence: 77%

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

et al. 2019

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“…The relaxation peaks are associated with a distribution of relaxation times of the electric dipoles of the PVB and correspond mainly to the electrical manifestation of the glass transition. In Figure 4 b, when the temperature increases above the Tg, a behavior of type

at low frequencies is observed, resulting [ 27 , 36 ] in ionic conductivity due to the rubbery state and the activation of the micro-Brownian motion of the polymer segments. This observed behavior is consistent with various reports for polymers like PMMA, PS, PET, and PEEK [ 8 , 10 , 11 , 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…As a general conclusion of these studies, the main relaxation consists of a thermally activated process, where electric dipoles of various chemical groups of the polymer chains participate. Carine et al [ 27 ] studied the secondary and principal relaxations of PVB using dielectric spectroscopy, for

and

. It was observed that when the temperature increased from 120 to 250 K,

increases and passes through the secondary β-relaxation peak at about 190 K. Above this region,

shows the α-relaxation peak at approximately 340 K, which is associated with the glass transition phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

Puente-Córdova,

Rentería-Baltiérrez,

López-Walle

et al. 2023

Polymers

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Dielectric and thermal properties of polyvinyl butyral (PVB) were studied in this work, using dynamic electrical analysis (DEA) at frequencies from 100 Hz to 1 MHz and temperatures from 293 K to 473 K. Two electrical relaxation processes were investigated: glass transition and interfacial polarization. Above the glass transition temperature (~343 K), interfacial polarization dominates conductive behavior in polyvinyl butyral. The framework of the complex electric modulus was used to obtain information about interfacial polarization. The viscoelastic behavior was analyzed through dynamic mechanical analysis (DMA), where only the mechanical manifestation of the glass transition is observed. The experimental results from dielectric measurements were analyzed with fractional calculus, using a fractional Debye model with one cap-resistor. We were successful in applying the complex electric modulus because we had a good correlation between data and theoretical predictions. The fractional order derivative is an indicator of the energy dissipated in terms of molecular mobility, and the calculated values close to 1 suggest a conductive behavior at temperatures above the glass transition temperature of PVB.

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“…However, for the MNPs with d S in the range of about 50 to 100 nm such a layer with lower magnetization can cause a reduction up to 15% of the total magnetization value (depending on the size of the MNPs). The second reason of the reduction of the saturation magnetization value is related to the concept of nanoscaling laws [31]. In the spherical MNPs at least three surface layers are not contributing to the ferromagnetic response not having the sufficient number of the nearest neighbors.…”

Section: Resultsmentioning

confidence: 99%

Adhesive and Magnetic Properties of Polyvinyl Butyral Composites with Embedded Metallic Nanoparticles

Terziyan

Сафронов

Бекетов

et al. 2021

Sensors

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Magnetic metallic nanoparticles (MNPs) of Ni, Ni82Fe18, Ni50Fe50, Ni64Fe36, and Fe were prepared by the technique of the electrical explosion of metal wire. The average size of the MNPs of all types was in the interval of 50 to 100 nm. Magnetic polymeric composites based on polyvinyl butyral with embedded metal MNPs were synthesized and their structural, adhesive, and magnetic properties were comparatively analyzed. The interaction of polyvinyl butyral (supplied as commercial GE cryogenic varnish) with metal MNPs was studied by microcalorimetry. The enthalpy of adhesion was also evaluated. The positive values of the enthalpy of interaction with GE increase in the series Ni82Fe18, Ni64Fe36, Ni50Fe50, and Fe. Interaction of Ni MNPs with GE polymer showed the negative change in the enthalpy. No interfacial adhesion of GE polymer to the surface of Fe and permalloy MNPs in composites was observed. The enthalpy of interaction with GE polymer was close to zero for Ni95Fe5 composite. Structural characterization of the GE/Ni composites with the MNPs with the lowest saturation magnetization confirmed that they tended to be aggregated even for the materials with lowest MNPs concentrations due to magnetic interaction between permalloy MNPs. In the case of GE composites with Ni MNPs, a favorable adhesion of GE polymer to the surface of MNPs was observed.

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Water-driven segmental cooperativity in polyvinyl butyral

Cited by 6 publications

References 15 publications

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

Adhesive and Magnetic Properties of Polyvinyl Butyral Composites with Embedded Metallic Nanoparticles

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