Polysilsesquioxanes (RSiO1.5)n are organic–inorganic hybrid materials that have an array of properties and synergistic features and are considered to be robust materials in the family of siliceous compounds.
Siloxane-functionalized
poly(ether carbonate)s (Si-PECs) were synthesized
from terpolymerization of carbon dioxide (CO2), propylene
oxide (PO), and [3-(2,3-epoxypropoxy)-propyl]-trimethoxysilane (KH-560).
Si-PECs with different molecular weights (1500–4000 Da) and
siloxane content (0–9.8% by mole) were obtained and used as
the soft segments of waterborne polyurethane (WPU). The carbonate
unit in polyols improved the mechanical and oxidation resistance of
WPU, whereas the siloxane units offered higher cross-linking density
and thermal stability. The particle size of the Si-PEC–WPU
emulsion varied from 100 to 684 nm as the siloxane unit content in
Si-PEC increased. Further, the Si-PEC–WPU film prepared from
Si-PEC having an M
n of 2200 and a siloxane
content of 3.9% by mole showed not only excellent mechanical performance
with a tensile strength of 16.5 MPa and elongation at a break of 683.4%
but also good hydrophobicity because of the carbonate units and siloxane
units. To summarize, Si-PECs derived from CO2 and inexpensive
silane coupling agents show good promise as an alternative for commodity
polyols for WPU applications.
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