Abstract
Although hindered phenol/polymer-based hybrid damping materials, with excellent damping performance, attract more and more attention, the poor stability of hindered phenol limits the application of such promising materials. To solve this problem, a linear hindered phenol with amorphous state and low polarity was synthesized and related polyurethane-based hybrid materials were prepared in this study. The structure and state of the hindered phenol were confirmed by nuclear magnetic resonance spectrum, Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The existence of intermolecular hydrogen bonds (HBs) between hindered phenol and polyurethane was confirmed by FT-IR, and the amorphous state of the hybrids was confirmed by XRD. Moreover, by a combination of molecular dynamics simulation and dynamic mechanical analysis, the relationship between the structure optimization of the hindered phenol and the high damping performance of the hybrids was quantitatively revealed. By constructing the synthetic hindered phenol, the intramolecular HBs between hindered phenols were restricted, while the strength and concentration of the intermolecular HBs increased by increasing the amount of hindered phenol. Thus, intermolecular interactions were enhanced, which lead to the compact chain packing of polyurethane, extended chain packing of hindered phenol, and good dispersion of hindered phenol in polyurethane. Therefore, the stability of the hindered phenol and the damping properties of the hybrids were both improved. The experiment results are expected to provide some useful information for the design and fabrication of high-performance polymeric damping materials.
Highlights
Nowadays, vibration and noise issues are predominant in engineering systems and affect people’s health [1,2,3]
For the 1 H NMR 5result in Figure 2a, the double peaks observed at about 6.973 ppm and the singlet at 6.848 ppm are line represents hydrogen bonds (HBs)): (a) hard segment repeating unit; (b) soft segment repeating unit; (c) TPU
The multiple peaks observed between polymer chain; (d) diyl bis 3-(3-tertbutyl-4-hydroxy5-methylphenyl)propionate (DP) molecule; (e) amorphous cell with a periodic boundary adopted; (f) energy
Summary
Vibration and noise issues are predominant in engineering systems and affect people’s health [1,2,3]. Polymer-based damping materials attract the most attention due to their unique viscoelastic properties [4,5,6]. For traditional polymer-based damping materials, such as blending [7], copolymerization [8] and interpenetrating network materials [9], external mechanical energy dissipated through the internal friction of molecular chains is a major step towards improvement. Polymers 2019, 11, 884 of damping properties [10,11,12]. Such energy dissipation may find it hard to satisfy the increasing requirement today [13]. The development of polymer-based materials with new energy dissipation is imperative
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