Silsesquioxanes as synthetic platforms. Thermally curable and photocurable inorganic/organic hybrids

Macromolecules

Volumn 29, Issue 6, 1996, Pages 2327-2330

  Sellinger, Alan ^a   Laine, Richard M ^a  

^a UNIVERSITY OF MICHIGAN   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001305591     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma951499y     Document Type: Article

References (37)

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25. 2. All other chemicals were used as received.
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27. n = 1010, PDI = 1.27. Mass spectral results (EI): m/z and intensities for tri-, tetra-, and pentasubstituted species within I are 797, 4.9%; 921, 3.8%; and 1045, 1.1%, respectively.
28. n = 1860, PDI = 1.40.
29. 2 methylene being hydrosilylated to a methyl group. One likely product is the intramolecular hydrosilylation product: (Equation Presented)
30. Mark, H. F.; Bikales, N. M.; Overberger, C. G.; Menges, G., Eds. Encyclopedia of Polymer Science and Engineering, 2nd ed.; John Wiley and Sons: New York, 1989; Vol. 15, p 251.
31. Sellinger, A.; Laine, R. M., unpublished work.
32. Simonsick, W. J. In Structure-Property Relations in Polymers: Spectroscopy and Performance; Urban, M. W., Craver, C. D., Eds.; American Chemical Society: Washington, DC, 1993; No. 711.
33. The product mixture, obtained on reacting 4 equiv of propargyl methacrylate with the octahydrido cubes, is very complex. Product distributions per reaction 1 ensure a set of α and β isomers. A statistical distribution of products without isomers should be ≈3% mono, ≈11% di, ≈22% tri, ≈27% tetra, ≈22% penta, ≈11% hexa, ≈3% hepta, and ≈0.4% octa. Additionally, the products contain vinylsiloxane moieties resembling the vinylsiloxane environment of Karstedt's catalyst [Pt(dvs)]. Thus, formation of one or two such moieties on the same edge of either cube might stabilize the active catalyst species and keep it on the cube face where it can react further, i.e., intra- and intermolecular hydrosilylation. Taken in toto, a nonstatistical product distribution is expected and found.
34. Sellinger, A.; Laine, R. M., unpublished work.
35. Derome, A. E. Modern NMR Techniques for Chemistry Research; Pergamon Press: Elmsford, NY, 1990; p 143.
36. Abrasion resistance studies will be reported at a later date. Sellinger, A.; Laine, R. M., unpublished work.
37. Sellinger, A.; Laine, R. M.; Zhang, C., manuscripts submitted for publication.