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Titolo:
Controlled release of carboxylic-containing herbicides by starch-g-poly(butyl acrylate)
Autore:
Zhu, ZF; Zhuo, RX;
Indirizzi:
Wuhan Univ, Dept Chem, Res Lab SEDC Biomed Polymer Mat, Wuhan 430072, Peoples R China Wuhan Univ Wuhan Peoples R China 430072 t, Wuhan 430072, Peoples R China
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 6, volume: 81, anno: 2001,
pagine: 1535 - 1543
SICI:
0021-8995(20010808)81:6<1535:CROCHB>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
STARCH; ENCAPSULATION; GROUNDWATER; PESTICIDES; COMPLEXES; REDUCTION; WATER;
Keywords:
starch; controlled release; encapsulation; starch graft copolymer; carboxylic-containing herbicide;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Zhu, ZF Wuhan Univ, Dept Chem, Res Lab SEDC Biomed Polymer Mat, Wuhan 430072, Peoples R China Wuhan Univ Wuhan Peoples R China 430072 430072, Peoples R China
Citazione:
Z.F. Zhu e R.X. Zhuo, "Controlled release of carboxylic-containing herbicides by starch-g-poly(butyl acrylate)", J APPL POLY, 81(6), 2001, pp. 1535-1543

Abstract

The use of starch-g-poly(butyl acrylate) as a new material for encapsulating carboxylic-containing herbicides such as 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid for controlled release was studied. The herbicides were individually encapsulated within the modified starch substrate, which was graft-copolymerized with a small amount of butyl acrylate. The modification of starch induced a hydrophobic behavior in the matrix, made it swell less, and caused the release rate to slow, especially for herbicides with higher water solubility. Therefore, the survival life of the starch products for controlled release could be expected to extend to some extent compared with that of natural starch. Tn addition, the effects of themolecular weight, herbicide content, and particle size on the swellabilityand release behavior were also investigated. Scanning electron microscopy revealed that the herbicides encapsulated within the starch matrix were dispersed in the form of tiny cell. Consequently, the herbicides encapsulated were released through diffusion. (C) 2001 John Wiley & Sons, Inc.

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Documento generato il 02/07/20 alle ore 18:59:09