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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 δ > 0.3) in a wide range of temperature from −60℃ to 35℃, 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. [ABSTRACT FROM AUTHOR]

Despite the development of strong, durable, and cost efficient polyisobutylene-based polyurethane (PIB-based 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 PIB-based PU and MWCNTs/PIB-based PU nanocomposites exhibit excellent damping properties (tan δ > 0.3) from −45°C to 8°C. POLYM. COMPOS., 36:198-203, 2015. © 2014 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

A series of organically modified montmorillonite (OMMT)/nitrile rubber (NBR) nanocomposites were prepared by a simple mechanical-mixing method. The structures of OMMT and the dispersion of OMMT in the rubber matrix were detected by X-ray diffraction (XRD). The mechanical properties of the NBR/OMMT nanocomposites were characterized, and the tribological behaviors of the nanocomposites were evaluated on a ring-block (MRH-3) wear tester. The results showed that the OMMT was homogeneously dispersed in the NBR matrix. The tensile strength of the OMMT/NBR nanocomposites increased with increasing OMMT contents. Both the coefficient of friction (COF) and wear of the nanocomposites decreased remarkably with increasing OMMT content. In addition, the influence of the applied load on the tribological properties of the nanocomposites is discussed. It is expected that the research may be of aid in the rational design and use of solid, self-lubricating nanocomposites under different loading states. [ABSTRACT FROM AUTHOR]