Synthesis and characterization of waterborne polyurethane/polyhedral oligomeric silsesquioxane composites with low dielectric constants

Abstract

A facile method was developed to synthesize a new type of polyhedral oligomeric silsesquioxane (POSS). It contained a single amine group and seven aliphatic moieties on its corners. FT-IR, 1 H-NMR, 13 C-NMR, 13 C-1 H COSY, and 1 H-1 H COSY confirmed that cages with eight corners were the main part of the product. This new POSS was used to modify the structure of hexamethylene diisocyanate trimer and then copolymerized with hexamethylene diisocyanate and poly (tetramethylene glycol) to get a serious of waterborne polyurethane (WPU)/POSS hybrid materials with low dielectric constants for microelectronics applications. The results showed that POSS particles were uniformly dispersed in the WPU dispersions. The WPU/POSS films did not show any macrophase separation, even when the POSS content was as high as 16%. As the POSS content increased from 0% to 16%, the tensile strength was increased from 2.3 to 7.3 MPa, the dielectric constant was decreased from about 2.9 to 2.0, and the thermal stability of the WPU/POSS was also improved.

Preparation and Properties of Self-Healing Waterborne Polyurethane Based on Dynamic Disulfide Bond

“…The absorption bands at 1460 and 1360 cm −1 are assigned to the –CH 2 – bending vibrations. The bands at 2940 and 2856 cm −1 are associated with the C–H asymmetry and symmetric stretching vibration of methylene in polyurethane molecular chain [ 20 , 21 ]. The band at 1110 cm −1 corresponds to bending vibration of C−O (aliphatic ether) in polyether polyol [ 22 ].…”

Composited Film of Poly(3,4-ethylenedioxythiophene) and Graphene Oxide as Hole Transport Layer in Perovskite Solar Cells

“…The cell structure is clearly displayed, and the thickness of the composite film is about 50 nm. Figure 2b presents the top view of the device [20][21][22]. The entire composite film is thin and evenly covered on the perovskite layer.…”

Recent Advances in Polyurethane/POSS Hybrids for Biomedical Applications

“…Less stable kinds of POSS, with isobutyl substituents, appear to be more stable in copolymerized form and enhance the thermal stability by reduction of chain mobility and blockage of some paths of degradation; however, the presence of POSS attached in hard segments may distort more thermally stable hard domains [ 33 , 34 , 35 , 36 ]. Besides thermal properties, POSS presence in polyurethanes influences, e.g., the tensile strength [ 29 , 37 , 38 ] and reduces the dielectric constant [ 37 , 39 , 40 ].…”