Data for: Facile Preparation of Tunable Polyborosiloxane Networks via Hydrosilylation

Polyborosiloxanes are used in a variety of fields due to their unique and
useful dynamic properties. Traditionally, crosslinked polyborosiloxanes
are prepared by incorporating boric acid into siloxane pre-polymers, a
process that is time consuming, energy intensive, and challenging due to
the immiscibility of the reagents. Here, we report a versatile synthetic
method to rapidly cure polyborosiloxane networks via hydrosilylation of
chain-end or backbone functionalized polydimethylsiloxane (PDMS)
derivatives with an inexpensive trivinylboronate. Networks synthesized
from these readily available building blocks cure in ~2 minutes at
convenient temperatures (e.g., 90 °C) and exhibit enhanced viscoelastic
behavior when compared to traditional polyborosiloxane networks fabricated
via the conventional condensation route. By virtue of using efficient
hydrosilylation chemistry, another key advantage of this synthetic
platform is the ability to synthesize dynamic polyborosiloxanes with
different network connectivity by simply using silicones with Si–H
moieties placed at the chain ends (telechelic) or distributed throughout
the repeat-unit structure (copolymers). The availability of other alkenes
amenable to hydrosilylation provides an additional formulation handle to
synthesize mixed dynamic–static networks with tunable control over stress
relaxation and solvent resistance. In summary, the synthetic approach
disclosed herein is a simple and accessible platform for preparing dynamic
polyborosiloxanes with tunable material properties.