ABS is synthesized from three chemical monomers: acrylonitrile, butadiene, and styrene. Each monomer contributes distinct properties: acrylonitrile provides high strength, thermal stability, and chemical stability; butadiene offers toughness and impact resistance; and styrene ensures ease of processing, a high-quality surface finish, and high strength.
Structurally, ABS is an amorphous material. The polymerization of these three monomers yields a two-phase terpolymer consisting of a continuous styrene-acrylonitrile phase and a dispersed polybutadiene rubber phase. The properties of ABS depend largely on the ratios of the three monomers and the molecular structure within the two phases. This allows for great flexibility in product design, resulting in the availability of hundreds of different grades of ABS on the market. These various grades offer a range of characteristics, such as varying levels of impact resistance (from medium to high), surface finish (from low to high gloss), and heat distortion resistance. ABS materials are characterized by exceptional processability, attractive aesthetic qualities, low creep, excellent dimensional stability, and high impact strength.