US EPA

2328381 

Journal Article 

Synthesis of polymers containing herbicides and their release behavior 

Kim, WS; Jung, SW; Jang, JK; Kim, GH; Lee, JK 

1998 

POLYMER SOC KOREA 

SEOUL 

6 

5 

414-421 

English 

WOS:000078662400009 

In order to prepare the controlled-release type herbicides of 2,4-dichlorophenoxyacetic acid (2,4-D) and its analogues, 2,4,5-trichlorophenoxyacetic acid, 2-methyl-4-chlorophenoxyacetic acid, and 2-(2,4-dichlorophenoxy) propionic acid, the herbicidal monomers were synthesized by reacting chloromethylstyrene with the sodium salts of 2,4-D and its analogues in chlorobenzene in the presence of triethylamine at 90 °C. The herbicidal polymers were prepared by radically copolymerizing acrylamide as hydrophilic monomer with the herbicidal monomers in dimethylformamide at 70 °C. Then, the amounts of the herbicides released through the hydrolysis of the copolymers were measured. As a result, the release rates of the herbicides from the copolymers with about 10 mol% of the herbicidal monomers were controlled more effectively with respect to the herbicides than those of the herbicides from the copolymers with about 5 mol% of the herbicidal monomers. This result could be explained in terms of the contents and the hydrophobicity of the herbicidal monomers in the copolymers.