“…Nakanishi et a1. 16 found that 73 remained constant as a function of crystallinity in PEEK as did Lind et al 33 in polypropylene. The constant 73 result in PEEK, in addition to the result that I;'"'"" extrapolated to zero at 100% crystallinity (mentioned earlier), was interpreted to mean that there were no sized oPs free volume cavities in the crystalline region of the system.16 While this is more than likely, there is a possibility that similar r3-sized holes exist in both the amorphous and crystalline phases and, thus, annealing to increase crystallinity would not influence the value of 73. It is claimed that the longest lived (oPs) component is affected by degree of crystallinity, either due to a crystalline contribution to free volume or due to physical constraints imposed by crystals; this claim will be discussed further during the presentation of results.…”