《Table 1 Crystal parameters of PPTA with different inherent viscosities》

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《Kinetics Analysis on the Polycondensation Process of Poly(p-phenylene terephthalamide):Experimental Verification and Molecular Simulation》

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Based on the optimal conditions as mentioned above，PPTA samples with different inherent viscosities were obtained by the twin screw.The detailed technological parameters for each reaction step within the twin screw will be discussed in another article.In the present study，microstructure parameters of the prepared PPTA resin were investigated by X-ray diffraction technique.An X-ray beam directed perpendicularly to the axis produced reflections from layer planes.The Scherrer equation was used to calculate the stacking height of layer planes in vertical direction of the crystal.Figure 4 presents equatorial X-ray diffraction patterns of PPTA with different inherent viscosities recorded at room temperature.Qualitative inspection of equatorial X-ray diffraction patterns showed three sharp peaks at about 2θ=20.9°（d=0.42 nm），2θ=23.6°（d=0.39 nm）and 2θ=28.5°（d=0.31 nm），which could be indexed as（110），（200） and（004）diffractions，respectively[36，37].Crystal parameters obtained from equatorial X-ray diffraction patterns are given in Table 1.It indicates that the crystallinity increased with the inherent viscosity but the stacking size（D）of PPTA was almost invariable even with different inherent viscosities and crystallinities.