Physicochemical and catalytic properties of polysiloxane network–Pt systems

Stochmal, Edyta; Strzezik, Joanna; Krowiak, Agnieszka

doi:10.1039/c7ra00641a

Cited by 10 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a high‐performance type of material, SiFs exhibit many outstanding characteristics, including good biological compatibility, nontoxicity, antiaging, strong sound absorption, chemical stability, light weight, ozone resistance, high‐ and low‐temperature resistance, and electrical insulation . Therefore, they are widely applied in aerospace, national defense, medicine, electrical, transportation, and construction industries . However, as the abundant hydrocarbon groups on its side chain, SiFs can smolder, combust, and release choking smoke once ignited, which become a bottleneck restricting their rapid popularization and application.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6] Therefore, they are widely applied in aerospace, national defense, medicine, electrical, transportation, and construction industries. [7][8][9][10][11][12] However, as the abundant hydrocarbon groups on its side chain, SiFs can smolder, combust, and release choking smoke once ignited, which become a bottleneck restricting their rapid popularization and application. Therefore, the flame retardation properties of SiFs warrant study.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Kang

Wang

Deng

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

The flame‐retardant microcapsules were successfully fabricated with an aluminum hypophosphite (AHP) core. Fourier transform infrared (FTIR) and X‐ray photoelectron spectroscopy (XPS) were used to verify that AHP was encapsulated in the microcapsules, and thermogravimetry analysis showed that microencapsulated AHP (MAHP) possessed higher thermal stability than that of AHP. Then, a flame‐retardant and smoke suppression system for silicone foams (SiFs) was obtained through a synergistic effect of MAHP and zinc borate (2ZnO·3B2O3·3.5H2O). The mechanical properties, flame retardance, and smoke suppression of SiFs with MAHP and zinc borate were tested using the tensile test, limiting oxygen index (LOI) test, UL‐94 test, and cone calorimeter test. The mechanical properties indicated that the tensile strength and elongation at break of SiFs could evidently improve with the incorporation of MAHP. Compared with pure SiF, SiF8 with 4.5‐wt% MAHP and 1.5‐wt% zinc borate could achieve an LOI value of 30.7 vol% and an UL‐94 V‐0 rating, the time to ignition amplified almost six times, the peak heat release rate and total heat release were 51.10% and 46.00% less than that of pure SiF, respectively, the fire performance index increased nearly 13 times, and the fire growth index value was only 13.18% of pure SiF. Moreover, the partial substitution of zinc borate imparted a substantial improvement in both flame retardancy and smoke suppression. Especially, the peak smoke production rate and total smoke production of SiF8 were merely 38.46% and 38.84% of pure SiF.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Kang

Wang

Deng

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Comparatively, platinum complexes with siloxane ligands are scarcely represented in the literature . However, as mentioned, one of them (Karstedt's catalyst) is commonly known as one of the most powerful hydrosilylation catalysts, with industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30][31][32][33][34] Comparatively, platinum complexes with siloxane ligands are scarcely represented in the literature. [35][36][37][38][39] However, as mentioned, one of them (Karstedt's catalyst) is commonly known as one of the most powerful hydrosilylation catalysts, with industrial applications. On the other hand, metal (copper, palladium) complexes of pyridyl-functionalized siloxanes showed catalytic activity in alcohol oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

Racleş¹,

Zaltariov²,

Damoc³

et al. 2019

Applied Organom Chemis

View full text Add to dashboard Cite

Although platinum nanoparticles and complexes ‐especially of Pt(0) and Pt(II)‐ are well known catalysts, siloxane‐based platinum complexes are rarely reported. Herein, a Platinum(IV) complex of 4‐aminopyridinium‐modified disiloxane was prepared and characterized by medium and far infrared spectroscopy, NMR and EDX. The formation of the complex was monitored by UV–Vis spectroscopy, which showed the high affinity and selectivity of this ligand for Pt, with a stability constant of 7.53·103 M−1. The catalytic activity of the siloxane‐based complex was tested in three types of reactions: reduction of p‐nitrophenol, oxidation of glucose and starch, and hydrosilylation. The hydrophobic behavior of the permethylated disiloxane moiety ensures good hydrolytic stability, while the N‐donor ligand stabilizes the in‐situ formed Pt nanoparticles. The generation of Pt nanoparticles during p‐nitrophenol reduction was confirmed by TEM and SEM. Contrary to most reports, the aerobic oxidation of mono‐ and polysaccharides occurred without oxidation agents or mediators added, in mild conditions, at room temperature and pH ~9. The same metal complex was found active in hydrosilylation of vinyl‐siloxanes with temperature‐modulated rate, thus being useful in silicone cross‐linking systems without the need of inhibitors. The method was adapted to one‐pot synthesis of silica‐supported Pt(IV) complex, which acted as efficient and reusable heterogeneous hydrosilylation catalyst, limiting the contamination of the product with Pt. This approach is promising for superior valorization of scarcely available and expensive platinum metal. By the same method, multifunctional soluble complexes and mesoporous silica may be obtained, with tunable catalytic performance.

show abstract

“…11 Thus, SIFs have been widely used for aerospace-related materials, heat-resistant, and shockabsorbing materials. [12][13][14] The thermal insulation and thermal stability of SIF materials have been improved by introducing functional organic or functional inorganic groups. [15][16][17] Vedolotti et al used sol-gel approach to fabricate a polyurethane foam with polysiloxanedomains to improve the thermal insulation capability of conventional foam material.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Wang

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

show abstract

Physicochemical and catalytic properties of polysiloxane network–Pt systems

Abstract: Polysiloxane networks with the ability to modify their topology as supports for platinum heterogeneous catalysts.

Cited by 10 publications

References 41 publications

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

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

Contact Info

Product

Resources

About