Reprocessing Postconsumer Polyurethane Foam Using Carbamate Exchange Catalysis and Twin-Screw Extrusion
Reprocessing Postconsumer Polyurethane Foam Using Carbamate Exchange Catalysis and Twin-Screw Extrusion
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DOI：
10.1021/acscentsci.0c00083
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发表时间：
2020-06-24
影响因子：
18.2
通讯作者：
Dichtel, William R.
中科院分区：
文献类型：
--
作者：
Sheppard, Daylan T.;Jin, Kailong;Dichtel, William R.
交联聚氨酯（PU）广泛用作热固性泡沫;然而，尚未开发出将来自商业来源的PU泡沫废物直接再加工成类似价值材料的方法。我们证明，引入二丁基二月桂酸锡（DBTDL）到交联聚氨酯泡沫和薄膜，使他们能够在高温下通过动态氨基甲酸酯交换反应的再处理。使用双螺杆挤出连续再加工模型和商业交联PU泡沫，以去除气态填料并生产具有弹性体或刚性热固性机械性能的PU长丝或膜。微复合模型PU泡沫的性能与使用相同单体合成的PU膜非常一致，表明该过程有效地发生。这些发现将使商业热固性聚氨酯废物的批量再处理，并激发其他热固性材料的再处理方法的进一步发展和化学上不同的交联材料的相容性。
Cross-linked polyurethane (PU) is extensively used as thermoset foam; however, methods to directly reprocess PU foam waste derived from commercial sources into similar value materials have not been developed. We demonstrate that introducing dibutyltin dilaurate (DBTDL) into cross-linked PU foams and films enables their reprocessing at elevated temperatures via dynamic carbamate exchange reactions. Both model and commercial cross-linked PU foams were continuously reprocessed using twin-screw extrusion to remove gaseous filler and produce PU filaments or films with elastomeric or rigid thermoset mechanical properties. The properties of microcompounded model PU foam were in excellent agreement with PU film synthesized using the same monomers, indicating that this process occurs efficiently. These findings will enable the bulk reprocessing of commercial thermoset PU waste and inspire the further development of reprocessing methods for other thermosets and the compatibilization of chemically distinct cross-linked materials.