Karstedt catalyst poly

Release force measurements were carried out after mixing the equilibration product with an a,co-divinyl(polydimethylsiloxane) at the desired ratio of SiH/vinyl and 100 ppm of platinum as a 1 % Karstedt catalyst solution in poly(dimethylsiloxane). The crosslinker thereby obtained was coated onto paper. Acrylate- (A7475, Beiersdorf) and rubber- (RP51, Raflatec) based adhesive tapes were stuck on the paper inline (inunediately after coating) and offline (after four weeks) and release force measurements were carried out at a speed of 0.3 m/min. 

A PEO macroinitiator with Si — H end groups was prepared through the condensation of monohydroxy-terminated PEO with CISiMePhH in the presence of pyridine [130]. The presence of the Si —Ph moiety prevents the hydrolysis of the Si — O — C bond, due to steric factors. This macroinitiator was subsequently used for the synthesis of poly(ferrocenyldimethylsilane), PFS, to afford PEO-fc-PFS block copolymers. The ROP of the ferrocenophane was conducted catalytically using the Pt(0) Karstedt s catalyst in toluene at 25 °C (Scheme 55). Rather broad molecular weight distributions (higher than 1.3) were obtained. 

The hydrosilylation-polymerization of 1,3-diethenyltetramethyldisiloxane (276) with 1,3-dihydrotetramethyldisiloxane (275) proceeds smoothly in the presence of Karstedt s catalyst to give high molecular weight poly[(l,l,3,3-tetramethyldisiloxanyl)ethylene] (277) (equation 104)273-274. 

Hydrosilylations of buckminsterfullerene (Cgo) with a poly(hydrosiloxane) (301) or H(SiMe20)3SiMe2H in the presence of Karstedt s catalyst (vide supra) proceed smoothly at 29 °C to give the corresponding (1 1) Cgo-polysiloxanes (302) with molecular weights of 5000 and 4000, respectively (equation 112)297. 

Treatment of Ceo with poly(hydrosiloxane) in the presence of Karstedt s catalyst proceeds to give Ceo-polysiloxanes (equation 20). ... 

Self-assembly of amphiphilic block copol5miers can be a new research area for applications of polycarbosilanes (54-56). An alternative route to prepare poly(silylenetrimethylene)s is hydrosilation of allylsilane derivatives bearing a Si—H group. [C6H5SiCl(CH2)3] i was synthesized by self-hydrosilation of allylchlorophenylsilane with Karstedt s catalyst (57). The synthesis of... 

Functionalization of UPy derivatives in order to prepare bi- or multifunctional telechelics is not limited to reactions on the ureido-substituent, but may also use a functionality at the 5- or 6-position of the pyrimidine ring (Scheme 2). Oleflnic UPy derivatives have been obtained by condensation of an ethylenically unsaturated /3-ketoester with guanidine. The resulting UPy 2f has been used to end-functionalize telechelic poly(dimethylsiloxane) via hydrosilylation with a Karstedt s catalyst [17]. 

Figure 15 Hydrosilylation of poly(styrene-6/odf-1,2-butadiene) with Karstedt s catalyst and fluorinated silane.

Weber and coworkers reported the incorporation ofperfluoroalkylsilylated chains in poly(divinylsiloxane) and poly(vinylmethylsiloxane) via platinum-catalyzed hydrosilylation of the vinyl side chain of the polymers (Fig. 18A). To minimize the loss of the Si—vinyl bond via photodesilylation, they used Karstedt s catalyst instead of the acidic Speier s H2PtCl6 catalyst. Even with incomplete hydrosilylation of the vinyl groups (i.e., only 50%... 

Synthesis of these polymers was carried out by means of hydrosilylation of poly(methylhydrosiloxane) with 35 monomer units (PMHS35) or 80 units (PMHS80). P-t-butoxycarbonyloxystyrene (TBCS), p-t-butoxystyrene (TBS) and t-butylmethacrylate (TMBA) were used as add-sensitive components. On account of resdts obtained earli for hydrosilylation platinum(divinyltetrametiiyl-disiloxane) (Karstedt compound) was used as a catalyst (11). Reactions were mcHutored by NMR and IR and were stopped when SiH groups were no longer detected. 

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