淀粉复合膜的堆肥降解性能研究

Composting degradation behavior of starch composite film

中文关键词:  淀粉复合膜  生物降解  堆肥

英文关键词:starch composite film  biodegradation  composting

中文摘要:

      目的 研究淀粉三层复合膜的降解过程及降解周期。方法 通过测定淀粉复合膜在受控堆肥条件下其排放的二氧化碳量来确定其最终需氧生物分解能力及其崩解程度, 通过测定失重率、扫描电镜、X-射线衍射、红外光谱等方法观察降解前后淀粉复合膜的形貌、结晶度、化学结构等变化。结果 淀粉复合膜在受控堆肥条件下表现出良好的生物降解性, 56 d后生物分解率可达47.23%, 与失重率相一致。淀粉复合膜在土埋降解的56 d内, 外观和微观形貌都发生了显著变化, 结晶度降低, 晶体结构被破坏, 降解前后没有产生新的基团, 只是大分子分解为小分子的过程, 降解周期为42 d。结论 淀粉复合膜在受控堆肥条件下具有良好的生物降解性。

英文摘要:

      Objective To determine the degradation process and degradation cycle of the starch three-layer composite film. Methods Determine the final aerobic biodegradability and its degree of disintegration by measuring the amount of carbon dioxide emitted by the starch composite film under controlled composting conditions. The morphology, crystallinity and chemical structure of the starch composite film before and after degradation were observed by measuring the weight loss rate, scanning electron microscopy, X-ray diffraction and infrared spectroscopy. Results The starch composite film showed good biodegradability under controlled composting conditions, and the biodegradation rate reached 47.23% after 56 d, which was consistent with the weight loss rate. Within 56 d of soil degradation of the starch composite film, the appearance and microscopic morphology changed significantly, the crystallinity decreased, the crystal structure was destroyed, and no new groups were generated before and after the degradation, but the process of decomposition of macromolecules into small molecules. The degradation cycle was 42 days. Conclusions The starch composite film has good biodegradability under controlled composting conditions.