Optical birefringence and infrared activation

PPEX compared with the intercalated nanocomposite fibres may be due to enhanced nanodispersion of the silicate platelets. In this respect, despite the fact that the exfoliated silicate platelets may increase point nucleating density, they reduce the volumetric space required for the nuclei to a spherulite growth. In addition, the nanodispersed silicate platelets would lead to a significant volume increase in the silicate layers in the polymer matrix, thus restricting the global self-diffusion ability of the polymer chain. 

At an angle of 28 between 13 and 29° in the fibre XRD spectra (not shown in Fig. 19.1 Lew, 2004), the equatorial reflection of the PP a-crystalline phase for PPEX fibre was greatly suppressed. This observation indicates that the improved PPEX birefringence may also be attributed to a decrease in the isotropic crystalline phase located towards the fibre circumference and an 

The manifestation of the 1003 cm Si—O vibration band forpredominantly phase-intercalated PPEZ, PPG3, PPG5 and PPB3 may be ascribed to a systematic distortion of the tetrahedral symmetry silicate plane structure by dipolar interaction between the Si—O or Si—OH and carbonyl group of the anhydride 

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