Preparation and characterization of silicone oil modified polyurethane damping materials

Abstract

A series of polyurethane (PU) composites, which could be used as damping materials, with different contents of hydroxyl silicone oil were successfully prepared in this study. The damping and mechanical properties, thermal stability, and molecular groups of the PU composites were characterized by dynamic mechanical analysis, electronic tensile analysis, thermogravimetric analysis, and Fourier transform infrared (FTIR) spectroscopy, respectively. The surface morphology was also observed via scanning electron microscopy (SEM). FTIR spectroscopy showed that the hydroxyl silicone oil was embedded in the PU. The soft and hard segments of the PU composites appeared thermodynamically incompatible and showed microphase separation, as shown by the SEM pictures. The PU composite with 8% hydroxyl silicone oil was found to possess the best synthetic properties among these composites. The maximum values of tan δ were 0.376, 0.561, and 0.573 at 1, 10, and 20 Hz, respectively. The temperature range for the use of damping materials becomes wider at 1 Hz. Frequencies of 10 and 20 Hz might suitable surroundings for the application of damping materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47579.

Relationship between structure and dynamic mechanical properties of thermoplastic polyurethane elastomer containing bi‐soft segment

“…The elastomers, [2] polymer foams, [3,4] composites, [5] and piezoelectric materials [6,7] have been considered as lightweight vibration damping materials. Among those damping materials, the thermoplastic polyurethane elastomer (TPU) [2][3][4][5][8][9][10][11][12][13][14][15][16][17][18][19] has been recognized as a promising vibration damping material due to its excellent mechanical and physical properties as well as its easy structure control and processing. The damping temperature range (ΔT) which is often defined as the temperature range at greater than 0.30 of dissipation factor (tan δ) of TPUs is narrow, resulting in restriction in practical applications.…”

“…Since the dynamic mechanical properties of TPUs are strongly relative to microphase separated morphology, many researchers have attempted to improve the damping properties via controlling the microstructure of TPUs such as blending, [17,20] interpenetrating polymer networks, [9,10,21,22] composite, [3,12] and modification of chemical structure. [13][14][15]23] For example, Zhou et al [17] investigated the damping properties of TPU and phenolic resin (PR) (TPU/PR) blends. Their results showed that the glass transition temperature (T g ) of TPU/PR was shifted from −17.0 to 31.5 C, the tan δ value was increased from 0.85 to 1.4, and the ΔT was improved to 7 C when the PR content increased from 0 to 40%.…”

“…They considered that the POSS mainly played a role of a plasticizer in modified EP/PU, resulting in significantly decreased T g and increased nonhomogeneity when added low content of POSS. Recently, Li et al [13] investigated the damping properties of PUs modified by various contents of hydroxyl silicone oil. Their results showed that the PU composite with 8% of hydroxyl silicone oil showed 0.376 of tan δ at 1 Hz, and the temperature range was showed between 50 and 94 C at greater than 0.34 of tan δ.…”

Biobased and Recyclable Polyurethane for Room-Temperature Damping and Three-Dimensional Printing

“…The unique viscoelasticity of polymers makes them popular as vibration damping materials in many fields, especially in earthquake protection. − Therefore, PLA-based TPUs show an excellent damping performance at room temperature, and the methyl pendant on the molecular chain can effectively enhance the damping performance while its mechanical properties are well-maintained. A simple comparison between our work and previous studies on T g and tan δ max was made and is shown in Figure d, showing the unique superiority of damping performance at room temperature. − ,− …”

Polyurethane: Recent Engineering Contributions

“…The damping, mechanical properties, thermal stability and molecular groups were established. It was found that the composites with 8% hydroxyl silicone oil possess the best properties [73]. Sandwich composites made of a core of flexible PU foam and nonwoven poly (ethylene terephthalate) as the top and bottom panels were produced.…”