Theoretical vs. Actual Value

Through the laws of physics, chemistry, and mechanics, in 1944 theoretical data was determined for different materials (42). These are compared to the present actual values 

Type of Material Modulus of Elasticity Tensile Strength  

For the experimental values the percentage of the theoretically calculated values is given in parenthesis, as (47). 

When polyethylene was first produced in the early 1940s, physicists in England, USA, and Germany predicted a tremendous potential for it. At that time the properties of PEs were much lower than those presently available. Out of that original general-purpose PE, have been developed specific PEs in this polyolefin family of plastics such as LDPE, HDPE, UHMWPE, and so on. In turn their different properties, as well as other plastics, continually increase and their variables continue to be reduced and/or easier to process to tighter tolerances. 

Research will no doubt become even more adept at manipulating molecules to the extent that the range of materials offered to industry will continue to present new 

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