以环境降解地膜为材料，地面覆盖为对照，采用水中浸泡、水面漂浮的处理方式，研究了环境降解地膜在水环境中的降解特性。研究结果表明，水中浸泡、水面漂浮及地面覆盖的环境降解地膜断裂伸长率保留率随处理时间延长均呈现先上升后下降的趋势，处理时间分别为70、50及40d 时，断裂伸长率保留率小于10%。DSC测试显示，环境降解地膜各处理熔融峰值变化不大，稳定在121℃左右，但熔融焓呈现上升趋势。暴露60d后，水中浸泡、水面漂浮及地面覆盖的样品熔融焓由未浸泡时的118.2J/g 分别上升至125.9、130.8和133.4J/g；结晶度从未浸泡时的40.33%分别变化为43.59%、44.63%和45.51%。扫描电镜测试结果显示环境降解地膜原样表面平整、光滑，没有裂纹和孔洞，浸泡在水中、漂浮于水面及地面覆盖60d后分别出现孔洞、裂纹及明显的脱落痕迹。
This paper studied on degradation characteristic of environmental degradation mulching film in water environment.Tensile test showed that elongation at break retention of the three group of environmental degra-dation mulching film increased initially and then decreased eventually.It decreased to 10% in 70,50 and 40days for the sample immersed in water,floated on water and covered on ground,respectively.DSC (differential scanning calorimetry)results showed the melting peak of environmental degradation mulching film had no change before and after exposed,but melting enthalpy increased from 118.2J/g to 125.9,130.8 and 133.4J/g;crystallinity increased from 40.33% to 43.59%,44.63% and 45.51% for the sample immersed in water,floa-ted on water and covered on ground,respectively.Cracks,holes and the fractions peeling off from polymer ma-trix were observed in SEM graphs.
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