Cross-linked polymer networks based on polysiloxane and nickel β-diketonate precursors

Ring-Opening Polymerization (ROP) and Catalytic Rearrangement as a Way to Obtain Siloxane Mono- and Telechelics, as Well as Well-Organized Branching Centers: History and Prospects

“…and rather low Tg, NA-modified polymers are attractive as active dielectric materials in actuating elements, capacitors, and flexible electronics [153]. Kim E. E. et al [154] prepared hydride-containing copolymers from D4 and D4 H in the presence of Amberlyst 15 catalyst (Figure 35). The resulting copolymers were used to obtain polysiloxanes with distributed dibenzoylmethane groups, on the basis of which a number of new cross-linked polymers were successfully obtained by the interaction of polyligand PDMS with grafted fragments of β-diketonate and nickel (II) acetate.…”

Cross-Linked Luminescent Polymers Based on β-Diketone-Modified Polysiloxanes and Organoeuropiumsiloxanes

“…A series of new luminescent cross-linked polymers based on β-diketone-modified polysiloxanes and oligoorganoeuropiumsiloxanes were obtained, as illustrated in Scheme 1. Polydimethylsiloxane (PDMS) with statistically distributed silylhydride groups 4 was synthesized according to the method described earlier [67,68] through the cationic ring-opening polymerization of a mixture of octamethylcyclotetrasiloxane 1 and methylhydrosiloxane cyclic oligomers 2 using hexamethyldisiloxane 3 as a terminating agent and Amberlyst 15 as a cationic catalyst. Polysiloxane 4 was obtained as a colorless oil with the following molecular characteristics: M n = 29,500 Da, M w = 49,600 Da, PDI = 1.68.…”

“…It should be mentioned that this sample exhibited the largest gel fraction, and it is obvious that its considerable cross-linking density improved its mechanical properties. The full polysiloxane analog that we previously synthesized [67], which we used as a model compound that did not contain metal-β-diketonate fragments, had a lower tensile strength (0.15 MPa) and elongation at break (47%) compared to those of polymers 8 a-d. The same can be noted about PDMS cross-linked through nickel β-diketonate fragments [67].…”

“…The full polysiloxane analog that we previously synthesized [67], which we used as a model compound that did not contain metal-β-diketonate fragments, had a lower tensile strength (0.15 MPa) and elongation at break (47%) compared to those of polymers 8 a-d. The same can be noted about PDMS cross-linked through nickel β-diketonate fragments [67].…”

“…The thermal stability of all samples was estimated in a thermal gravimetric analysis (TGA) in both air and argon in the range from 50 to 700 °C, and data are summarized in Figure 9 and Table 3. The full polysiloxane analog that we previously synthesized [67], which we used as a model compound that did not contain metal-β-diketonate fragments, had a lower tensile strength (0.15 MPa) and elongation at break (47%) compared to those of polymers 8 a-d. The same can be noted about PDMS cross-linked through nickel β-diketonate fragments [67].…”