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- W3096252214 abstract "Abstract Two kinds of bio‐based polyurethane coatings for controlled‐release urea were prepared by in‐situ polymerization used castor oil and liquefied starch as raw materials, respectively. Scanning electron microscopy (SEM) showed that the section morphology of castor oil based polyurethane (Castor‐PU) coating was uniform and dense, and that of liquefied starch based polyurethane (Starch‐PU) coating had certain proportion of microporous. Infrared spectroscopy (IR) showed that the two coatings had typical urethane characteristic structure, but the difference was that the Starch‐PU had obvious unreacted isocyanate structure. Differential scanning calorimetry (DSC) showed that the glass transition temperature of the two coatings was around 58°C, but the Castor‐PU had a crystallization domain with obvious crystallization melting peak at 130°C. Thermogravimetric analysis (TG) showed that the thermal stability of Castor‐PU was significantly higher than that of Starch‐PU. The controlled‐release property test showed that when the coating ratio was 2.8%, the nutrient release longevity of urea coated with Castor‐PU was 49 days and that of urea coated with Starch‐PU was 14 days. The reasons for the poor controlled‐release performance of Starch‐PU were analyzed, which probably caused by concentrated sulfuric acid and hydrophilic dispersant added in the liquefied starch." @default.
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- W3096252214 date "2020-10-29" @default.
- W3096252214 modified "2023-10-16" @default.
- W3096252214 title "Structure and properties of bio‐based polyurethane coatings for controlled‐release fertilizer" @default.
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- W3096252214 doi "https://doi.org/10.1002/app.50179" @default.
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