Influence of metallic palladium on thermal properties of polysiloxane networks

Wójcik‐Bania, Monika; Olejarka, Justyna; Gumuła, T.; Łącz, Agnieszka; Hasik, Magdalena

doi:10.1016/j.polymdegradstab.2014.07.025

Cited by 16 publications

(20 citation statements)

References 40 publications

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“…However, the FTIR spectra for PDMS/Pt/NS showed peaks assigned to methane (3018 cm -1 and 1306 cm -1 ) [22]. Moreover, the new peak at 1356 cm -1 for PDMS/Pt/NS was attributed to stretching vibration of Si-CH 2 -Si [28,29]. Those products were attributed to two competing mechanism during thermal degradation.…”

Section: Thermal Degradation Under Nitrogen Atmosphere 321 Tg-ftirmentioning

confidence: 94%

Synergistic effect and mechanism of platinum catalyst and nitrogen-containing silane on the thermal stability of silicone rubber

et al. 2016

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Platinum (Pt) catalyst and nitrogen-containing silane (NS) were introduced to improve the thermal stability of silicone rubber. The effects of Pt and NS on thermal stability and degradation mechanism of silicone rubber were investigated by thermogravimetry (TG), thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDXS) and Fourier transform infrared spectrometry (FTIR). A significant synergism was found between Pt and NS for improving the thermal stability of silicone rubber. When 6.67 ppm of Pt and 1.4 phr of NS were introduced, the temperature of 10% and 20% weight loss under nitrogen atmosphere were respectively increased by 36 oC and 119 oC. Meanwhile, the residue weight at 900 oC was doubled to 68% in the presence of Pt/NS. The synergistic mechanism might be that the nitrogen atom coordinated with Pt and improved the catalytic efficiency of Pt. Additionally, NS preserved the catalytic activity of Pt under air atmosphere. Hence, Pt/NS efficiently catalyzed thermal crosslinking and suppressed degradation of silicone chains. Moreover, it revealed that the presence of Pt/NS protected silicone chains from oxidation. Thus, the unzipping depolymerization by silanol groups was reduced significantly.

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Section: Thermal Degradation Under Nitrogen Atmosphere 321 Tg-ftirmentioning

confidence: 94%

Synergistic effect and mechanism of platinum catalyst and nitrogen-containing silane on the thermal stability of silicone rubber

et al. 2016

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“…It allows to monitor the course and efficiency of the hydrosilylation reaction [27,47]. It is also used to determine the consumption of Si-H groups during the reduction of transition metal ions [48,49]. Exemplary FTIR spectra of polysiloxane matrices containing 2 wt % of organo-mineral nanofiller are shown in Figure 5.…”

Section: Monitoring Of Cross-linking Eficiencymentioning

confidence: 99%

The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Wójcik‐Bania

Matusik

2021

Materials

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Polymer–clay mineral composites are an important class of materials with various applications in the industry. Despite interesting properties of polysiloxanes, such matrices were rarely used in combination with clay minerals. Thus, for the first time, a systematic study was designed to investigate the cross-linking efficiency of polysiloxane networks in the presence of 2 wt % of organo-montmorillonite. Montmorillonite (Mt) was intercalated with six quaternary ammonium salts of the cation structure [(CH3)2R’NR]+, where R = C12, C14, C16, and R’ = methyl or benzyl substituent. The intercalation efficiency was examined by X-ray diffraction, CHN elemental analysis, and Fourier transform infrared (FTIR) spectroscopy. Textural studies have shown that the application of freezing in liquid nitrogen and freeze-drying after the intercalation increases the specific surface area and the total pore volume of organo-Mt. The polymer matrix was a poly(methylhydrosiloxane) cross-linked with two linear vinylsiloxanes of different siloxane chain lengths between end functional groups. X-ray diffraction and transmission electron microscopy studies have shown that the increase in d-spacing of organo-Mt and the benzyl substituent influence the degree of nanofillers’ exfoliation in the nanocomposites. The increase in the degree of organo-Mt exfoliation reduces the efficiency of hydrosilylation reaction monitored by FTIR. This was due to physical hindrance induced by exfoliated Mt particles.

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“…This reaction occurred at the intermolecular or intramolecular and accompanied by the evolution of volatile Si compound, which may be higher order cyclic siloxane. 29,35 Another degradation mechanism could be attributed to the random scission, the high temperature increased the free motion rate of the polysiloxane chain and promoted the random degradation. Fig.…”

Section: Thermal Performancementioning

confidence: 99%

Thermal insulation and stability of polysiloxane foams containing hydroxyl-terminated polydimethylsiloxanes

Zhang

Wang

et al. 2018

RSC Adv.

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Influence of metallic palladium on thermal properties of polysiloxane networks

Cited by 16 publications

References 40 publications

Synergistic effect and mechanism of platinum catalyst and nitrogen-containing silane on the thermal stability of silicone rubber

Synergistic effect and mechanism of platinum catalyst and nitrogen-containing silane on the thermal stability of silicone rubber

The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Thermal insulation and stability of polysiloxane foams containing hydroxyl-terminated polydimethylsiloxanes

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