Biodegradable polyurethane materials from bark and starch. II. Coating material for controlled-release fertilizer

被引：62

作者：

Ge, JJ ^{[1
]}

Wu, R ^{[1
]}

Shi, XH ^{[1
]}

Yu, H ^{[1
]}

Wang, M ^{[1
]}

Li, WJ ^{[1
]}

机构：

[1] Fudan Univ, Key Lab Mol Engn Polymers, Dept Macromol Sci, Shanghai 200433, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2002年 / 86卷 / 12期

关键词：

polyurethanes; biodegradable; polyester;

D O I：

10.1002/app.11211

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Biodegradable polyurethane foams (PUFs) as coating materials for the controlled release of fertilizer were prepared from a four-component system consisting of diisocyanate, polyester, Acacia mearnsi bark, and corn starch. Ammonium sulfate [(NH4)(2)SO4] was used as a fertilizer to evaluate the effects of the preparation conditions on the release ratio. The release ratio of (NH4)(2)SO4 decreased with an increasing amount of biomass in PUFs and increasing sizes of sample particles; the ratio increased with increasing doses of water, which was used as a foaming agent in the preparation of polyurethane, regardless of the amount of coating material. tic remaining fertilizer in the polyurethane seemed to be released completely because the PUFs were degradable, to some extent, by soil microorganisms. (C) 2002 Wiley Periodicals, Inc.

引用

页码：2948 / 2952

页数：5