Bond Stiffness versus Modulus

Elastomers are long chained polymers that are bent back upon themselves many times. They have moduli of less than 1 GPa. The segments of the molecules will freely slide back across each other and are strengthened by fillers and the occasional cross-link. Table 2.7 shows bond type versus stiffness and modulus. With increasing temperature, entropy or disorder increases. Thus, stretching these types of parts decreases their entropy because molecules are aligned to become more crystalline. 

Bond Type Bond Stiffness (N/m) Young s Modulus (GPa) Example 

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