Light scattering and intrinsic viscosity investigation of polymethyl‐3, 3, 3‐trifluoropropylsiloxamer

Abstract

Solution parameters for the polymer poly‐γ‐trifluoro‐propylmethylsiloxamer has been determined in cyclohexyl acetate, methyl hexanoate, and ethyl acetate. Interpretation of data follows the theory of Fox and Flory. In contrast to poly‐dimethylsiloxane, an increased steric hindrance to rotation about the siloxane bond occurs as evidenced by the characteristic ratio of root‐mean‐square end to end dimensions, (r02/r0f2)1/2, found to be 1.90 and 1.96 at 25.0 and 72.8°C, respectively. This increase is considered to be primarily due to nearest‐neighbor interaction of the polar substituent on the silicon atom. The relation, [η]θ ∝ M1/2, was observed to hold for this polymer system. The hydrodynamic model appropriate for the polymer is a random coil considerably more permeable to solvent flow than is generally reported for linear polymers. The universal parameter ϕ was determined to be 1.5 × 1021. The effect of temperature on polymer configuration is indicated to be negligible.

Synthesis of polysiloxanes containing trifluoroethylene aryl ether groups: The effect of promoters

“…Fourier‐transform infrared (FTIR) spectra were recorded on a Shimadzu IRAffinity‐1S spectrometer with KBr pellets at room temperature. Intrinsic viscosity ([η]) of Si‐TFVE was determinated by Ubbelohde viscometer using toluene as solvent . Differential scanning calorimetry (DSC) was performed on Netzsch Instrument DSC 200F3 at a heating rate of 10 or 20 K/min under nitrogen flow with a rate of 20 mL/min.…”