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Our simulations reveal a systematic red shift in three vibrational bands (800\u2013700, 680\u2013640, and 385\u2013360 cm\u22121) as temperature increases. To elucidate the microscopic origin of these shifts, we perform phonon calculations under distinct structural scenarios, including helical unwinding, helix reversal defects, and controlled expansion of in-plane lattice constants. Only the increase in interchain distance reproduces the observed shifts, indicating that these modes are sensitive to intermolecular coupling. Eigenmode analysis shows that these redshifting bands are dominated by symmetric CF2 stretching motions with transverse fluorine displacements, which directly modulate interchain separation. In contrast, torsional, bending, and asymmetric stretching modes exhibit negligible frequency changes. 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