tuPOY: Thermally Unstable Partially Oriented Yarns by H. D. Mustafa Sunil H. Karamchandani Shabbir N. Merchant & Uday B. Desai

Author:H. D. Mustafa, Sunil H. Karamchandani, Shabbir N. Merchant & Uday B. Desai
Language: eng
Format: epub
Publisher: Springer India, New Delhi

2. bending vibrations which constitutes a change in the bond angle.

Fig. 3.5FTIR spectroscopy compares the morphologies of tuPOY and regular POY. The transmittance in excess of 100 % verifies the radiating properties of tuPOY

The molecular vibrations bring about a change in the dipole moment of the molecule and hence give rise to absorption and transmission bands in the infrared spectrum. When infrared beam falls on tuPOY, the lattice does not allow the beam to completely pass through it. This occurs because the molecular arrangement in the lattice is not aligned in the direction of the beam. The infrared beam utilizes some of its energy to align the molecules in lattice with the incident beam, in order for the infrared rays to pass through. The energy required to align the lattice is termed as the vibrational energy, and the phenomenon in which the lattice atoms align with the direction of the infrared beam is known as vibrational resonance. The difference between the incident energy and the vibrational energy is projected in the Fourier spectrum in terms of the transmittance.

When a material radiates electromagnetic energy in space, the phenomenon is called electrical resonance. The results of infrared spectroscopy of tuPOY reveal that at certain frequencies the transmittance exceeds 100 %. At those specific frequencies, the infrared rays cause resonance on the lattice surface. The infrared radiation possesses sufficient energy to remove electrons from atoms in materials, through which the radiation passes. tuPOY emits the excess energy, which it has absorbed en masse, at remnant frequencies during which the material has failed to achieve resonance. At these frequencies, a transmittance percentage in excess of 100 % is observed as vibrational resonance is already achieved, due to lattice alignment and also due to the occurrence of electrical resonance, validating the radiating properties of the material.

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