Reinforcement of Polyether Polyurethane with Dopamine-Modified Clay: The Role of Interfacial Hydrogen Bonding
Reinforcement of Polyether Polyurethane with Dopamine-Modified Clay: The Role of Interfacial Hydrogen Bonding
复制标题
DOI：
10.1021/am300947b
复制
发表时间：
2012-09-01
影响因子：
9.5
通讯作者：
Lu, Xuehong
中科院分区：
文献类型：
--
作者：
Phua, Si Lei;Yang, Liping;Lu, Xuehong
采用溶剂共混法成功地将多巴胺改性粘土(D-Clay)分散到聚醚型聚氨酯(PU)中。研究发现，在粘土含量很低的情况下，D-粘土的加入可以显著提高PU的力学性能，包括初始定伸应力、拉伸强度和极限伸长率。较大的增强作用可归因于PU硬段与硬质D-粘土层之间的氢键，从而导致聚合物与D-粘土层之间更有效的界面应力传递。此外，D-粘土与PU的相互作用也强于30B沸石有机粘土与PU链的相互作用。因此，在相同的粘土负载下，PU/D-粘土纳米复合材料在高温下具有比PU/有机粘土纳米复合材料高得多的储能模量。
Dopamine-modified clay (D-clay) was successfully dispersed into polyether polyurethane (PU) by solvent blending. It is found that the incorporation of D-clay into PU gives rise to significant improvements in mechanical properties, including initial modulus, tensile strength, and ultimate elongation, at a very low clay loading. The large reinforcement could be attributed to the hydrogen bonds between the hard segments of PU and stiff D-clay layers that lead to more effective interfacial stress transfer between the polymer and D-clay. Besides, the interactions between D-clay and PU are also stronger than those between Cloisite 30B organoclay and the PU chains. Consequently, at a similar clay loading, the PU/D-clay nanocomposite has much higher storage modulus than the PU/organoclay nanocomposite at elevated temperatures.