Szczegóły publikacji
Opis bibliograficzny
Networks derived from poly(methylhydrosiloxane) of various average molecular weights – characterization and incorporation of Pt particles / Edyta STOCHMAL, Aleksandra CHECHELSKA-NOWORYTA, Maria OWIŃSKA, Magdalena HASIK // Journal of Molecular Structure ; ISSN 0022-2860. — 2022 — vol. 1259 art. no. 132692, s. 1-13. — Bibliogr. s. 12-13, Abstr. — Publikacja dostępna online od: 2022-02-23
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 139437 |
|---|---|
| Data dodania do BaDAP | 2022-03-15 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.molstruc.2022.132692 |
| Rok publikacji | 2022 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Molecular Structure |
Abstract
In the work, polysiloxane networks were prepared by hydrosilylative cross-linking of two poly(methylhydrosiloxane)s (PMHS) differing in the average molecular weight: PMHS1 of Mn = 3 800 g/mol and PMHS2 of Mn = 13 800 g/mol using linear divinyldisiloxane (ViMMVi) and cyclic tetravinyltetrasiloxane (D4Vi) as cross-linkers. It was found that PMHS2-based materials were characterized by higher cross-link densities than the PMHS1-derived ones, the effect being more pronounced in the case of D4Vi than ViMMVi. This was explained by the presence of entangled chains in PMHS2 and high functionality of D4Vi. Higher cross-link density resulted in lower rate of platinum incorporation into PMHS2-based networks, conducted in PtCl4 solutions in tetrahydrofuran. The reaction of Pt4+ ions from the solutions with Si-H groups remaining in the networks led to the formation of metallic Pt nanoparticles (2–5 nm in size) in all the materials. Due to higher cross-link density, however, which inhibited Pt penetration into the bulk, surface metal coverage in the PMHS2-originated networks was higher as compared to the ones obtained from PMHS1. Presence of Pt resulted in most cases in the increase in residual mass after treatment at 1000 °C in Ar atmosphere (the so-called ceramic yield) with respect to the initial samples. Results of the studies point to the significant influence of the average molecular weight on properties of PMHS-based networks and may be helpful when planning the use of such materials as ceramic precursors or as carriers for metal particles for various, e.g. catalytic applications.