Characterisation of Gum Rubber Using Dilute Solution Methods

Characterisation of Gum Rubber Using Dilute Solution Methods 

The purpose of characterisation may be stated as, in the most general terms, elucidation of a structure-property relationship. The structural characteristics include MW, its distribution, branch patterns and gel types. Microstructure is also included in this category. In addition there are compositional differences among copolymers and blends. The term, property, implies static characteristics such as density and specific heat, although sometimes, dynamic characteristics such as viscoelastic behaviour, are called viscoelastic properties. In order to be all-inclusive the structure-property relationship may be restated as the relationship between the structure/composition and property/behaviour. 

Why do we need to elucidate such a relationship This question is seldom asked because the answer may be presumed to be obvious. In the industrial context, the answer lies in the relationship shown in the following sequence  

Specific gum rubber is manufactured to meet the requirements of a finished product having certain properties. This also requires the gum rubber to be processable with the available equipment. Therefore, the characterisation activity is a valuable and often indispensable link in the above relationship. When a problem arises because of an unsatisfactory property in the product or unsatisfactory processability, the final answer must be sought on how to alter the manufacturing process to produce a gum rubber with acceptable properties. In short, we need to establish the above relationship as the background knowledge needed for a day-to-day operation of the manufacturing process as well as for problem solving. 

Type DTA T (°6 Nominal % Acrylonitrile Specific Gravity Average Mooney Viscosity Anti- Oxidant Special Properties Potential Uses 

---