The use of rubber requires a certain degree of solubility
2022-08-24 10:30
For rubber, natural, cis-1,4-polybutadiene, isoprene rubber, etc. can be uniformly mixed in any proportion, ultimately reaching a phase solubility state.
Detailed introduction
For rubber, natural, cis-1,4-polybutadiene, isoprene rubber, etc. can be uniformly mixed in any proportion, ultimately reaching a phase solubility state.
Natural rubber and Butyl rubber cannot be mixed evenly.
If mixed mechanically, the actual performance of the obtained vulcanizate will significantly decrease due to their poor solubility.
The most important factor in the combination system is solubility. From an application perspective, if the mixture is uneven, it not only fails to achieve the purpose of combination, but also affects the process, especially vulcanization.
Therefore, the focus of the question is whether the two types of rubber can be mixed with each other, and what degree of compatibility can be achieved after mixing.
When solid rubber is used together, due to the high viscosity of rubber itself, the Brownian motion of polymer is not as easy as that of liquid, and the diffusion speed is slow, which causes great resistance to the displacement of macromolecules and seriously affects the mutual compatibility between rubbers.
For this reason, in industrial production, mechanical force is used to enhance molecular motion, and the viscosity is reduced by increasing temperature and adding softeners to promote the mixing of the two types of rubber. Therefore, although the products do not have phase separation from a macro perspective, there are not many reasons why they truly reach a dissolved state. The reasons include the polarity of rubber, cohesive energy density, crystallization of rubber, and molecular weight of rubber.
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