Mrówka J, Gackowski M, Lityńska-Dobrzyńska L, Bernasik A, Kosydar R, Drelinkiewicz A, Hasik M. Poly(methylvinylsiloxane)-Based High Internal Phase Emulsion-Templated Materials (polyHIPEs)-Preparation, Incorporation of Palladium, and Catalytic Properties.
Ind Eng Chem Res 2020;
59:19485-19499. [PMID:
33191976 PMCID:
PMC7660935 DOI:
10.1021/acs.iecr.0c03429]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 09/24/2020] [Accepted: 10/14/2020] [Indexed: 11/30/2022]
Abstract
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Poly(methylvinylsiloxane)
(V3 polymer) obtained by kinetically
controlled anionic ring-opening polymerization of 1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane
was cross-linked with various amounts of 1,3,5,7-tetramethylcyclotetrasiloxane
(D4H) in w/o
high internal phase emulsions (HIPEs). PolyHIPEs thus prepared differed
in the polymer cross-linking degree, which affected their porous morphology
and total porosity. The obtained V3 polymer-based polyHIPEs
were applied as matrices for the incorporation of Pd from the Pd(OAc)2 solution in tetrahydrofuran. This process involved the conversion
of Si–H groups remaining in the polymer networks and resulted
in the formation of crystalline, metallic Pd in the systems. Mean
sizes of the generated Pd crystallites were lower in polyHIPEs of
higher than in those of lower polymer cross-linking degrees and porosities
(∼5 nm vs ∼8 nm, respectively). The
Pd-containing polyHIPEs showed activity in catalytic hydrogenation
of the triple carbon–carbon bond in phenylacetylene giving
the unsaturated product, styrene with a selectivity of ca. 80%. To
the best of our knowledge, this is the first work devoted to polysiloxane-based
polyHIPEs with dispersed metallic particles.
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