Introduction to the New Copolymer of Chloroprene and Acrylonitrile with Differentiated Properties

Abstract

The random copolymer of chloroprene and acrylonitrile is a newly developed rubber whose features and value propositions are not scientifically explored yet. This article focuses on the basic characterizations and properties of acrylonitrile-chloroprene rubber. Qualitative analyses through infrared (FTIR) and nuclear magnetic resonance (1H-NMR) spectra confirm the presence of both the -Cl and -CN groups in the new rubber. As evidenced through differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA), the single glass transition temperature of acrylonitrile-chloroprene rubber reflects its monophasic random microstructure. While compared against commercial grades of chloroprene rubber (CR) and nitrile rubber (NBR), the new rubber provides a distinctive combination of properties that are not available with either of the elastomer alone. Acrylonitrile-chloroprene rubber demonstrates slightly lower specific gravity, an improved low-temperature compression set, higher flex-fatigue resistance, and lower volume swelling in IRM 903 and Fuel C to chloroprene rubber. As compared to nitrile rubber, the new copolymer shows appreciably better heat aging and ozone resistance. Good abrasion resistance, low heat buildup, and remarkably high flex-fatigue resistance indicate excellent durability of the acrylonitrile-chloroprene rubber under dynamic loading. Based on the preliminary results, it is apparent that the new copolymer can be a candidate elastomer for various industrial applications which demand good fluid resistance, high heat and low-temperature tolerances, good weatherability, and durability under static and dynamic conditions.

Changes in crosslinking structure of thermo‐oxidative aging chloroprene rubber and its effect on strain‐induced crystallization

“…Chloroprene rubber (CR) is a self-crystallizing elastomer with high molecular regularity, widely used in flexible conduits, lifeboats, fuel system sealing and corrosionresistant coatings. 1,2 And its crystal structure is similar to natural rubber (NR). While compared with NR, it has better durability, lower oxidation rate, and lower sensitivity to swelling in non-polar solvents.…”

“…Chloroprene rubber (CR) is a self‐crystallizing elastomer with high molecular regularity, widely used in flexible conduits, lifeboats, fuel system sealing and corrosion‐resistant coatings 1,2 . And its crystal structure is similar to natural rubber (NR).…”

Influence of different curing regimes on properties of new copolymer of chloroprene and acrylonitrile

“…On the other hand, it offers lower heat build-up, better heat aging resistance, and ozone resistance than NBR. 10,11 These unique combinations of attributes of acrylonitrilechloroprene rubber are not achievable by either CR homopolymer 12 or NBR alone 13 or by their physical blends. 14 The latitudes of applications of any rubber in diverse areas are dictated by the mix of properties that it can offer.…”

“…There has been no prior report published on its functionalities by any other research groups besides us. 10,11,21 Consequently, the impact of different curatives on acrylonitrile-chloroprene rubber (NCR) remains uncharted to date. The key intent of this study is to identify the viable curing regimens and explore their influences on the performances of NCR.…”