【摘要】 以控制释放肥料为模型,采用膜失重率法、膜形态分析法和CO2产量测定法考察了不同成膜因素如取代度、铸膜液溶剂及铸膜液浓度对酯化改性淀粉膜生物降解性能的影响。结果表明,改性淀粉取代度越高,铸膜液溶剂挥发性越低,铸膜液浓度为16%时,膜土壤降解速率越小。30℃恒温时,初步优化的改性淀粉膜在土壤中30d失重率为20%,21d降解成CO2的比率为1.98%。改性淀粉膜在土壤中能降解且有较小降解速率,能够满足控制释放肥料对膜降解性的要求。更多还原

【Abstract】 The effects of degree of substitution,casting solvents and concentration on degradability in soil for the starch acetate(SA) membrane were investigated by weightlessness.The degradability in soil of membrane was determined by microscope observation and CO2 quantity.The results show that the higher the DS is,the slower the volatility of solvents are,the slower degradation rate is.Moreover,the degradation rate is slow when the casting mass fraction is 16%.Finally,the mass loss in soil at 30 ℃ is about 20% after 30 days and the CO2 quantity is about 1.98% after 21days.Results suggeste that the SA membrane has a little soil degradation and can be applied to membrane material for controlled release fertilizer.更多还原