Table 1 Preparation and properties of polystyrene ball modified with copolymers of acrylamide and methacryloyl hydrazide

4-Nitro-

Nitrogen content

Copolymer

Content of active hydrazide groups on

phenyl

in the copolymer

activity by

a carrier (μmol/cm²), determined

acrylate

by elemental

the reaction

by the decrease in the

by the reaction

content,

analysis, %

with TNBS^*,

copolymer content in

of ball with

mol.%

(theoretical

OD₅₂₀

solution

TNBS