PTeOX distortion parameters

Table 2,1. Weight-average crystallite size (D ) and distortion parameter (g) in PTeOX prepared at various temperatures...

Here, annealing effects on the lattice constant, the dimension of the crystal, and the distortion parameter, are examined. Figure 4.21 shows the 001 reflection profQes of as-polymerized PTeOX, annealed, aiai melt-crystallized POM (Delrin). By armealing the sample at 180 °C for 10 and 40 min the intensity peak shifts to a lou angles and obtains a similar profQe as that of Delrin. 

The weight-average crystallite size D, and the maximum distortion parameter g are obtained by line broadening analysis. The results are summarized in Table 4.2. In PTeOX obtained at 105 °C, g decreases by annealing at 170 °C for 2 hours. In PTOX no special change is observed excq>t when annealed at 180 °C for 30 min. In this case, the folded chain crystal is formed inbetween the extended chain crystals, or main crystals, to give larger g values. 

TaUe 2.1 the azes (D ) and the distortiem parameters (g) alcmg the chain axis fOT tte two typ of oystallites in the samjdes PTeOX-62, -81, and -105. Hie cr tal sbes erf 250 A and 100 A are assodated widi the fibrillar and lamellar (xystals, re ie( vefy. The distortion paran er die filxillar crystallites is about 3 times as large as that a[ the lamellar cryi lite fm both PTeOX-81 and -105. 

---