Kinetic Study On Polymer Functional Reaction System Under Shear Flow

As an effective means, reactive process has been widely used to obtain desired properties and also been studied for decades. However, most of the present studies were motivated principally by industrial applications and focused on the improvement of physical properties of the blend systems. Only a few studies were reported in the examination of the reaction kinetics in the reactive process. The most common methods for data acquisition are FTIR, titration and GPC. Errors would be introduced using them because they are not on-line methods although they are very mature. Normally the polymer materials would have been mixed and sheared in processing. However, generally less attention has been paid to the effect of shear flow on the reactive process, most on the reaction kinetics, which may be attributed to the complexity of the flow. Therefore, in this paper, reaction kinetics have been studied by some useful methods such as titration, GPC and rheological method in various reactive systems including PBT/epoxy, polycaprolactam and SMA/PA6. Moreover, by comparing reaction kinetic parameters obtained under different shear flows, we investigated the effects of shear flow on different reactive systems. The main contents and conclusions are listed below:1. Rheology and reaction kinetics analysis on PBT/epoxy reactive system The rheological property of PBT/epoxy reactive system has been investigated.The process can be divided into three different stages. The complex viscosity increases within short time during stage I attributing to the reaction between carboxyl group of PBT and epoxy group at interface. Then, the complex viscosity maintains at a steady value in stage II for saturated copolymer layer preventing the meeting of the reactive chains and the reaction entering into a stagnant stage. After that, the complex...