Synthesis of hyperbranched polycarbosilanes by hydrosilylation of triallylsilane is reported. Soluble high molecular weight polymer was obtained in an uncontrolled bulk reaction. Addition of 2‐(10‐decen‐1‐yl)‐1,3‐oxazoline (i) afforded control over degree of polymerization (DP) and (ii) resulted in hyperbranched macromonomers. 17000 ≥ Mw ≥ 800 (GPC (PS)) was obtained. 29Si NMR spectroscopy allowed identification of dendritic, branched, linear, and terminal silicon branch‐points. A modified definition for the degree of branching yielded a value of 0.48 ± 0.05 (theory: 0.44).
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Lach et al. (1997) studied this question.
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