Despite the development of strong, durable, and cost efficient polyisobutylene-based polyurethane (PIBbased PU) materials has yet to be achieved. The well dispersion and maximum interfacial interaction between the nanofiller and the PIB-based PU at low loading have been scarcely studied. Here, the preparation of PIB-based PU nanocomposites with Multiwalled carbon nanotubes (MWCNTs) using a simple in situ polymerization method is reported. The thermogravimetric analysis tests show that MWCNTs significantly improved the thermal stability of MWCNTs/PIB-based PU nanocomposites. Compare to the pure PIB-based PU the onset temperature of degradation for the nanocomposite was about 20 C higher at 0.7 wt% MWCNTs loading. Efficient load transfer is found between the nanofiller MWCNTs and PIB-based PU and the mechanical properties of the MWCNTs/PIB-based PU nanocomposite with well dispersion are improved. A 63% improvement of Young's modulus and slightly increased of tensile strength are achieved by addition of only 0.7 wt% of MWCNTs. The experimentally determined Young's modulus is in well agreement with the theoretical simulation. It is worth noting that the PIBbased PU and MWCNTs/PIB-based PU nanocomposites exhibit excellent damping properties (tan d > 0.3) from 245 C to 8 C. POLYM. COMPOS.,

A series of polyisobutylene/polyethylene glycol-based polyurethane nanocomposites are filled with various contents of multi-walled carbon nanotubes as H-bonds acceptor chain extenders. The damping properties, tensile strength, as well as oxidative/hydrolytic stability of the multi-walled carbon nanotubes-modified polyisobutylene/polyethylene glycol-based polyurethane nanocomposites were studied systematically. Results revealed that the incorporation of multi-walled carbon nanotubes can significantly improve the mechanical capacity especially when the multi-walled carbon nanotubes content was only 0.3wt%, the tensile strength of the polyisobutylene/polyethylene glycol-based polyurethane nanocomposites increased by ca. 126% compared to the pure polymer matrix. Activation enthalpy of the transition process and Halpin-Tsai model is used to investigate the reinforced mechanisms of the polyisobutylene/polyethylene glycol-based polyurethane nanocomposites, which indicate the multi-walled carbon nanotubes as H-bonds acceptor chain extenders lead to the strong interface interaction between the multi-walled carbon nanotubes and matrix. It is worth noting that the polyisobutylene/polyethylene glycol-based polyurethane nanocomposites also exhibit excellent damping properties (tan d > 0.3) in a wide range of temperature from À60 C to 35 C, and the PIB/PEG-based PU and polyisobutylene/ polyethylene glycol-based polyurethane nanocomposites exhibit good oxidative/hydrolytic stability. It is anticipated that our current work would inform ongoing efforts to exploit PIB/PEG-based PU nanocomposites, which may be used as damping materials.

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