可降解聚氨酯泡沫塑料的制备及性能

Synthesis and properties of biodegradable polyurethane foams

以聚乙二醇/聚己内酯(PEG/PCL)为复合软段,采用二丁基二月桂酸锡(DBTL)和三乙烯二胺(A33)作为复合催化剂,采用硅油(AK8807)作为泡沫稳定剂,由一步法制得了具有均匀泡孔且开孔率较高的可降解PUF(聚氨酯泡沫塑料);采用红外分析(IR)、光学显微镜等分析手段对这些材料的结构和形貌进行了表征,考察了材料的力学与热稳定性等性能。结果表明:随着PEG-400的升高,PUF的拉伸强度、断裂伸长率和压缩强度基本呈现非常明显的下降趋势;PEG-400:PCL-210N比例为100:0时分解温度最高,比例为70:30时分解温度最低,而最大热失重温度所反映的热稳定性好坏和起始温度所反映的基本是一致的;PUF的Tg处于-70℃到-30℃范围内,并随着PEG-400含量的增加呈提高趋势,这与其热稳定性相一致。

PEG/PCL used as mixed soft segments,DBTL and A33 as compound catalysts, AK8807 as foam stabilizer, composited biodegradable polyurethane foam （PUF） was synthesised by one-step method, which had uniform bubbles and higher porosity. The structure and transmission morphology were characterized by IR and optical microscope and so on. It was researched that mechanical and thermal stability of PUF, etc.. Finally the conclusion was obtained： the tensile strength, the elongation at break and the constant strain stress were increased with the increasing of PEG-400 content. The decomposition temperature was the highest when the ratio of PEG/PCL was 100：0, while it was the lowest when the ratio of PEG/PCL was 70： 30. whether the thermal stability was good reflected by the maximum therrno--gravimetric tempera- ture was consistent with starting temperatures reflects. The Tg was in the range of -- 70℃- 30℃, and increased with the increasing of PEG--400 content, which was consistent with the thermal stability.