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To determine if the parameters of two molecules (usually a solvent and a polymer) are within range a value called interaction radius (R0) is given to the substance being dissolved. With this technique, we can say “more than 90%” success. The Interaction Radius(R0) set very large for PPG and very small for highly fluorinated polymers. Some polymer like PPG(poly propylene glycol) will dissolve almost all solvents and Some polymer like highly fluorinated polymers will dissolve almost no solvents. If you are experimental polymer chemist, then this Interaction Radius(R0) concept is very very familiar. We introduced Interaction Radius(R0) concept into solubility search for polymers.
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We need to confess one trick when we say “more than 90%”. The percentage of success predict resolvability become more than 90% with Hansen Solubility parameter method. This concept help us to search polymer solvents dramatically. Our concept is “likes vectors dissolve likes vectors”.
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So Hildebrand SP is not adequate to search polymer solvents. Solubility parameter basic concept is “likes dissolve likes”. The chemist easily understand the difference of solubility Ethanol and Nitroethane with this 3D chart. So Hildebrand SP is the length of Hansen SP vector’s length. Hansen Solubility Parameter and Hildebrand SP has relationship of following scheme. We show you 3-dimensional chart of Hansen Solubility Parameter of Ethanol and Nitroethane. Those are Dispersion(dD), Polarity(dP) and Hydrogen bonding(dH), and we treat this 3 terms as vector. On the contrary, Hansen Solubility Parameter divided solubility energy into 3 parts. But every chemist feel strange if they hear solubility of Ethanol and Nitroethane is same. For example, the Hildebrand SP of Ethanol and Nitroethane is almost same. The Hildebrand SP is based on just Heat of vaporization, so if the Heat of vaporization is very near even though chemical structure is so different, Hildebrand SP become same. If you use much and much solvents the percentage of success will going down. A lot of researcher try to use Hildebrand solubility parameter for this purpose and fail because Hildebrand SP will predict resolvability less than 60%. If we use Hansen Solubility Parameter(HSP), we can easily find solvents for polymers. Initial Sphere determing apparatus that Dr. Hiroshi Yamamoto Please Use HTML5 Browser
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HSP Application note #2 How to search polymer solvents with Hansen Solubility Parameter(HSP)