New hyperbranched poly(siloxysilanes): Variation of the branching pattern and end-functionalization

Juan F. Miravet; Jean M.J. Fréchet

doi:10.1021/ma971778g

New hyperbranched poly(siloxysilanes): Variation of the branching pattern and end-functionalization

Juan F. Miravet, Jean M.J. Fréchet^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

141 Scopus citations

Abstract

The synthesis of new poly(siloxysilanes) by polyhydrosilation of AB₂, AB₄, and AB₆ monomers using a solid-supported catalyst is described. Analysis of the polymers by gel permeation chromatography shows weight-average molecular weight values near 5-10 000 amu with polydispersities of ∼2. Addition of fresh monomer to the polymerized material only leads to a slight increase in molecular weight. In all cases, polymerization is accompanied by significant intramolecular cyclization side reaction. These results can be explained by considering factors such as the unequal reactivity of the different oligomeric species and their tendency to form cyclic species, but no clear evidence for a growth-limiting effect arising from steric crowding could be seen. End capping of the terminal silicon hydride groups by hydrosilation with a variety of reagents has been demonstrated, affording a diversity of functionalized poly(siloxysilane) materials.

Original language	English (US)
Pages (from-to)	3461-3468
Number of pages	8
Journal	Macromolecules
Volume	31
Issue number	11
DOIs	https://doi.org/10.1021/ma971778g
State	Published - Jun 2 1998
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "New hyperbranched poly(siloxysilanes): Variation of the branching pattern and end-functionalization",

abstract = "The synthesis of new poly(siloxysilanes) by polyhydrosilation of AB2, AB4, and AB6 monomers using a solid-supported catalyst is described. Analysis of the polymers by gel permeation chromatography shows weight-average molecular weight values near 5-10 000 amu with polydispersities of ∼2. Addition of fresh monomer to the polymerized material only leads to a slight increase in molecular weight. In all cases, polymerization is accompanied by significant intramolecular cyclization side reaction. These results can be explained by considering factors such as the unequal reactivity of the different oligomeric species and their tendency to form cyclic species, but no clear evidence for a growth-limiting effect arising from steric crowding could be seen. End capping of the terminal silicon hydride groups by hydrosilation with a variety of reagents has been demonstrated, affording a diversity of functionalized poly(siloxysilane) materials.",

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year = "1998",

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TY - JOUR

T1 - New hyperbranched poly(siloxysilanes)

T2 - Variation of the branching pattern and end-functionalization

AU - Miravet, Juan F.

AU - Fréchet, Jean M.J.

PY - 1998/6/2

Y1 - 1998/6/2

N2 - The synthesis of new poly(siloxysilanes) by polyhydrosilation of AB2, AB4, and AB6 monomers using a solid-supported catalyst is described. Analysis of the polymers by gel permeation chromatography shows weight-average molecular weight values near 5-10 000 amu with polydispersities of ∼2. Addition of fresh monomer to the polymerized material only leads to a slight increase in molecular weight. In all cases, polymerization is accompanied by significant intramolecular cyclization side reaction. These results can be explained by considering factors such as the unequal reactivity of the different oligomeric species and their tendency to form cyclic species, but no clear evidence for a growth-limiting effect arising from steric crowding could be seen. End capping of the terminal silicon hydride groups by hydrosilation with a variety of reagents has been demonstrated, affording a diversity of functionalized poly(siloxysilane) materials.

AB - The synthesis of new poly(siloxysilanes) by polyhydrosilation of AB2, AB4, and AB6 monomers using a solid-supported catalyst is described. Analysis of the polymers by gel permeation chromatography shows weight-average molecular weight values near 5-10 000 amu with polydispersities of ∼2. Addition of fresh monomer to the polymerized material only leads to a slight increase in molecular weight. In all cases, polymerization is accompanied by significant intramolecular cyclization side reaction. These results can be explained by considering factors such as the unequal reactivity of the different oligomeric species and their tendency to form cyclic species, but no clear evidence for a growth-limiting effect arising from steric crowding could be seen. End capping of the terminal silicon hydride groups by hydrosilation with a variety of reagents has been demonstrated, affording a diversity of functionalized poly(siloxysilane) materials.

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JO - Macromolecules

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New hyperbranched poly(siloxysilanes): Variation of the branching pattern and end-functionalization

Abstract

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