Synthesis of Low Temperature Resistant Hydrogenated Nitrile Rubber Based on Esterification Reaction

Abstract

Hydrogenated Nitrile Rubber (HNBR) is widely used in aerospace, petroleum exploration and other fields because of its excellent performances. However, there remains a challenge of balancing the oil resistance and the low temperature resistance for HNBR. In this work, a series of grafted carboxyl nitrile rubber (XNBR) was prepared by the esterification reaction between active functional groups (–COOH) of XNBR and alkanols of different molecular chain lengths (C8H17OH, C12H25OH, C16H33OH, C18H37OH) or Methoxypolyethylene glycols (MPEG) of different molecular weights (Mn = 350, 750, 1000). The structure and low temperature resistance of as-obtained grafted polymers were characterized by Fourier Transform Infrared (FTIR), 1H-NMR and Differential scanning calorimetry (DSC). It was found that the glass transition temperatures (Tg) of grafted XNBR were significantly decreased. MPEG grafted polymers with better low temperature resistance were then selected for hydrogenation. As-prepared hydrogenated XNBR grafted with MPEG-1000 (HXNBR-g-1000) showed the lowest Tg of −29.8 °C and the best low temperature resistance. This work provides a novel and simple preparation method for low temperature resistant HNBR, which might be used potentially in extremely cold environments.

Physicochemical Studies on the Effect of Hexamine Addition and Ratio on the Properties of Acrylonitrile Butadiene Rubber Composites

“…Therefore, the improvement of the mechanical, thermal, and electrical conductivity of acrylonitrile butadiene rubber (NBR) is an active field for a lot of researches and studies. [20][21][22][23][24] The need for new materials fulfills different and specific applications urge this desire. In this work, NBR/HA rubber composites were prepared aiming to enhance the entire electrical and thermal properties of NBR.…”

“…This combination was known to enhance the thermal resistance of NBR. Therefore, the improvement of the mechanical, thermal, and electrical conductivity of acrylonitrile butadiene rubber (NBR) is an active field for a lot of researches and studies [20–24] . The need for new materials fulfills different and specific applications urge this desire.…”