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A Novel Hybrid 2,4-Dichlorophenoxy Acetate Bead from Modified Cassava Starch and Sodium Alginate with Modified Natural Rubber Coating
- Riyajan, Sa-Ad
- Journal of polymers and the environment 2018 v.26 no.5 pp. 1950-1961
- acetates, cassava starch, coatings, encapsulation, herbicides, rubber, separation, sodium alginate
- A novel herbicide bead was developed by phase separation, utilizing modified cassava starch (CSt), sodium alginate (SA) and 2,4-dichlorophenoxy acetate (2,4 DA), and the beads were also coated with natural rubber grafted with cassava starch (NR-graft-CSt) to aid their water resistance. The alginate gel beads with 65% entrapped 2,4 DA showed 90% release within 24 h. The incorporation of CSt in the beads markedly improved their encapsulation efficiency to 98% and sustained the release of the herbicide for 700 h. The water resistance was improved by coating the beads with NR-graft-CSt when compared with the pure CSt/SA bead. The synthesized bead has excellent potential for agricultural applications.