Calculation. Determination And Application Of Solubility Parameter On SBR And IIR

In this study, three different calculation method were adopted to calculate hansen solubility parameter of styrene butadiene rubber (SBR) and three different grades of butyl rubber (IER):Butyl 301, Chlorobutyl 1240 and Bromobutyl X2. Simultaneously, hansen solubilty parameter of these rubber were determined by equilibrium swelling method combined with computer software. Then the result of two method were compared. Besides, Hansen two-dimensional solubility graph, polymer solubility window and the relationship curve between relative energy differences (RED) and rubber swelling ratio were studied. In order to investigate the influence of crosslinking density of rubber, we prepared a sense of different crosslinking density SBR sample, then Hansen solubility parameter of these sample were determined. The Flory-Huggins interaction parameter could also be obtained, the Flory-Huggins interaction parameter was used to judge the solvents was "good" or "bad" solvents. In this way, we also can obtained Hansen solubility parameter of SBR. Finaly, in order to apply Hansen solubility parameter theory to select suitable plasticizer for butyl rubber, we determined Hansen solubility parameter of liquid paraffin, paraffinic oil, aromatic oil, combined with DOP which kown the Hansen solubility parameter, the plasticizing effect of these plasticizer were studied. In addition to, we also studied the application of Hansen solubility parameter theory on butyl rubber after filled carbon black.The results showed that there are was some different between Hansen solubility parameter which obtained from calculation and Hansen solubilty parameter which obtained from equilibrium swelling method. In our study, we used the result which obtained from experiment as the final result. The result showed the Hansen solubility parameter of those rubber were:δd=16.82(MPa)1/2, δp=3.00(MPa)1/2,δh=3.38(MPa)1/2, δt=17.41(MPa)1/2; Butyl 301:δd=17.1(MPa)1/2,δP=1.2(MPa)1/2,δh=0.7(MPa)1/2; Chlorobutyl 1240; δd=17.2(MPa)1/2,8p=1.1(MPa)1/2,δh=0.2(MPa)1/2; Bromobutyl X2; δd=17.2(MPa)1/2,δp=0.7(MPa)1/2,δh=0.7(MPa)1/2. Besides, along with the crosslinking density change, Hansen solubility parameter of the SBR almost had no change. Only when the crosslinking density was very low, Hansen solubility parameter of SBR would have a little change. The Hansen two-dimensional graph and polymer solubility window could be used in select solvents and mix solvents to swelling or dissolve the butyl rubber.Moreover, the RED values between rubber and solvents were calculated by the Hansen solubility parameters. The results of the correlation between swelling ratio and RED showed that the swelling ratio of rubber decreased with increased RED values. When the RED values was 1, the inflection point was appeared. So we concluded that the swelling behavior of rubber in the solvents could be determined by theoretical calculation, which had very extensive application value and great exploition foreground.Finally, by the mean of the plasticizing effect on the different plasticizer studied, we found the experiment result were consisted with the expected result which got from calculation. So we can used hasnen solubilty parameter theory as the principle to select suitable plasticizer for butyl rubber. In addition, Hansen solubility parameter theory also could apply to select plasticizer for the butyl rubber which filled the carbon black. In the future, Hansen solubility parameter will have geater fuction on selecting plasticizer for rubber.