Damping elastomer with broad temperature range based on irregular networks containing hyperbranched polyester and dangling chains

Abstract

Elastomer is one of the important materials for vibration and noise reduction.However, its narrow effective damping temperature range (tanδ ≥ 0.3) remains to be a major issue that hinders its application as a damping material. Herein, we precisely design and synthesize a polyurethane structure where specific dangling chains with both electron-donating group and electron-absorbing group were introduced into prepolymers, generating more hydrogen bonding interaction with the main chain to hinder microphase separation. At the same time, hyperbranched polyester as a cross-linking agent increases its free volume effectively. The synergy effect of enhancement of hydrogen bonding, decrease of microphase separation, and increase of free volume results in a higher damping polyurethane elastomer with a great wider effective damping temperature range up to 175°C (−60°C-115°C), which provides a new idea for the preparation of damping elastomer.

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

“…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%.…”

Diphenolic acid-modified PAMAM/chlorinated butyl rubber nanocomposites with superior mechanical, damping, and self-healing properties

“…performance of the composite material.However, this method is difficult to apply to the field of electrical insulation because it may improve the conductivity of the composites.The introduction of reversible sacrificial bonds to enhance the damping performance of polymer elastomers has become the focus of research in recent years [16]. In short, a large amount of energy can be effectively consumed by destroying these reversible sacrificial bonds in the system, thereby improving the toughness and damping properties of the materials [17,18].…”

Controllable synthesis of network polyacrylate from hyperbranched polyesters and their effect to bond strength of asphalt

“…20,21 These features of HBP have been used extensively in diverse fields, such as coatings, binders, sensors, energy, medicine. [22][23][24][25][26][27] In the most cases, the processing temperature of asphalt is about 200 C, and this makes it easy for the terminal groups on the HBP surfaces to react with the reactive groups in asphalt. In addition, the polar groups in the HBP also could form abundant hydrogen bonds with polar groups in asphalt, which provide a promising opportunity to explore an efficient method to improve bond strength between the inorganic mineral and asphalt interface.…”

“…Owing to these reactive groups, the properties of HBP could be adjusted by chemical modification of the terminal groups 20,21 . These features of HBP have been used extensively in diverse fields, such as coatings, binders, sensors, energy, medicine 22‐27 . In the most cases, the processing temperature of asphalt is about 200°C, and this makes it easy for the terminal groups on the HBP surfaces to react with the reactive groups in asphalt.…”