For a linear polymer molecule, the total chain length L depends on the bond length between chain atoms d, the total number of bonds in the molecule N, and the angle between adjacent backbone chain atoms θ, as follows:

Furthermore, the average end-to-end distance for a series of polymer molecules r in Figure 14.6 is equal to
r = ˆšdN (14.12)
A linear polytetrafluoroethylene has a number-average molecular weight of 500,000 g/mol; compute average values of L and r for this material.

L - Ndsin 14.11)