Table 1.

Diffraction angles (2θ), inter-planar spacing (d) and crystallite size (t) of PET fiber, and modified PET fiber.

Sample Code	Peak NO.	2θ(o)	$\mathbf{d}=\mathsf{\lambda }/\left(2\mathbf{sin}\mathsf{\theta }\right)$ (À)	$\mathbf{t}=0.9\mathsf{\lambda }/\mathsf{\Delta }\omega \mathbf{cos}\mathit{\theta }$ (À)
PET fiber	1	17.92	4.95	53.63
MPP-modified PET fiber	1	14.24	6.22	54.26
	2	17.86	4.97	53.28
	3	22.12	4.02	51.66
	4	25.20	3.53	62.77
TMPP-modified PET fiber	1	14.24	6.22	54.35
	2	17.18	5.16	52.88
	3	18.69	4.75	52.16
	4	21.98	4.04	51.24