Abstract: A heatresistant ABS resin was prepared by a selfdeveloped, fourkettle plug flow reactor tube through bulk polymerization, and Nphenyl maleic (NPMI) was used as the modifier. It was found that the resin containing 3 % NPMI had better tensile strength and higher thermal deformation temperature, and the impact strength was relatively low. In order to improve the thermal deformation temperature while keeping certain impact strength, some contrast experiments were made to research the influence of NPMI and rubber addition on the structure and properties of ABS resin. When the same amount of NPMI was added to the 1st and 3rd reactors at the same time, the tensile strength of ABS resin was 54.3 MPa, and the impact strength was 162.3 J/m, and the thermal deformation temperature was 84.6 ℃, which were much better than those of the product obtained when NPMI was added in the 1st or 3rd reactor separately.

Key words: arylonitrile-butadiene-styrene copolymer, bulk polymerization, plug flow reactor, instrumented impact test