Spectroscopic studies have revealed that the amount of polyureas formed and the kinetics of their formation in soy based polyurethane systems are considerably different from traditional systems employing ethylene oxid...Spectroscopic studies have revealed that the amount of polyureas formed and the kinetics of their formation in soy based polyurethane systems are considerably different from traditional systems employing ethylene oxide-propylene oxide (EO-PO) based polyols.The aggregation of polyureas was characterized by the hydrogen bonds formed utilizing FTIR spectroscopy.This study offered the opportunity to assign the previously undefined infrared features.The structural transformation is reflected in the segmental rel...展开更多
The researches on confined polymer chain can date back to Cassasa’s work in the sixties. Recently, work in this field became more important. Apart from the obvious significance in basic science, the entropic repulsio...The researches on confined polymer chain can date back to Cassasa’s work in the sixties. Recently, work in this field became more important. Apart from the obvious significance in basic science, the entropic repulsion owing to its wide presence in macromolecules is very important in relation to many diverse processes such as GPC, colloid stability, flocculation stability of biological membranes, behaviours of polymers in pores, adhesion and lubrication. On the other hand, with the surface force展开更多
文摘Spectroscopic studies have revealed that the amount of polyureas formed and the kinetics of their formation in soy based polyurethane systems are considerably different from traditional systems employing ethylene oxide-propylene oxide (EO-PO) based polyols.The aggregation of polyureas was characterized by the hydrogen bonds formed utilizing FTIR spectroscopy.This study offered the opportunity to assign the previously undefined infrared features.The structural transformation is reflected in the segmental rel...
基金Project supported by the National Natural Science Foundation of China
文摘The researches on confined polymer chain can date back to Cassasa’s work in the sixties. Recently, work in this field became more important. Apart from the obvious significance in basic science, the entropic repulsion owing to its wide presence in macromolecules is very important in relation to many diverse processes such as GPC, colloid stability, flocculation stability of biological membranes, behaviours of polymers in pores, adhesion and lubrication. On the other hand, with the surface force
