Raman spectroscopic study
To investigate the effect of increase crystallite size on amorphous and interfacial regions Raman analysis was conducted. Figure 1 shows a representative Raman spectrum of 10.0 % α-T-UHMWPE. The de- Figure 1 Typical Raman Spectra of 10.0 % α-T UHMWPE convolution of the pattern in the region 1400-1550 cm-1 was used to obtain the CH2 units in orthorhombic packing. The intensity band at 1080 cm-1 was used to obtain the amorphous contents. Note that the intensity band at 1295 cm-1 was used as internal standard [4]. The percentage of inter-facial region was obtained as follow. % interfacial = 1- (%crystalline +% amorphous) As seen in Fig. 2, the amorphous region between the crystalline lamellae decreases while the irregular all trans transient phase or interfacial phase between crystalline and amorphous increases with the increase in the crystal size (see table 1).
|
