Interpretation of the Structure of Poly(Ethylene Terephthalate) by Dynamic FT-IR Spectra

Abstract

Poly(ethylene terephthalate) (PET) was studied by the technique called dynamic infrared spectroscopy with the use of digital signal processing. The dynamic infrared signals of PET were correlated with the reorientation movement of functional groups and the deformation of internal coordinates, which depend upon the morphology of the sample. With the use of this novel approach, it is demonstrated that the internal coordinate change of the trans C–O bond plays an important role in the macroscopic deformation of oriented PET; the reorientation movement is differentiated in the case of unoriented PET, where the phenyl ring contributes more in such a process.

Study of the electronic and vibrational properties of poly(ethylene terephthalate) and poly(ethylene naphthalate) films

“…2. 2,19,20 PEN exhibits large similarities with PET ͑it has a triclinic unit cell͒ with the addition of a second phenyl ring, forming the naphthalene group. 2,19,20 PEN exhibits large similarities with PET ͑it has a triclinic unit cell͒ with the addition of a second phenyl ring, forming the naphthalene group.…”

“…[1][2][3][4][5] Moreover, PET and PEN are excellent candidate materials to be used in the production of flexible electronic devices, such as flexible displays and photovoltaic cells by large-scale manufacturing processes, 6-8 since they exhibit a combination of very important properties, such as easy processing, good mechanical properties, and reasonably high resistance to oxygen and water vapor penetration. [1][2][3][4][5] Moreover, PET and PEN are excellent candidate materials to be used in the production of flexible electronic devices, such as flexible displays and photovoltaic cells by large-scale manufacturing processes, 6-8 since they exhibit a combination of very important properties, such as easy processing, good mechanical properties, and reasonably high resistance to oxygen and water vapor penetration.…”

Viscoelastic behavior and submolecular level dynamic heterogeneity of hydrogen‐bonded polymer blends probed by dynamic FTIR spectroscopy

“…Therefore, dynamic FTIR spectroscopy is a powerful technique to study the mechanical properties of materials, especially polymers on the (sub) molecular level. Various materials such as wood polymers,1 polyethylene fibers,2 lignin,3 bacterial cellulose composites,4 Bombyx mori fibroin film,5 syndiotactic polypropylene (PP),6 polyurethane elastomer,7 poly(ethylene terephthalate),8 polyisoimide prepolymer,9 high‐/low‐density polyethylene blends, and liquid crystals10 have been studied using dynamic FTIR spectroscopy. However, no dynamic FTIR studies on hydrogen‐bonded polymer blends have been found.…”

“…However, the interaction of the components with their local environment, as well as intrinsic mobility differences, can cause them to exhibit different relaxation times (i.e., distinct component T g s). This phenomenon has referred to as dynamic heterogeneity, which has gained keen interest in the past decade,1–21 and various techniques such as differential scanning calorimetry (DSC), DMA, dielectric relaxation spectroscopy (DRS), nuclear magnetic resonance (NMR), quasi‐elastic neutron scattering (QENS), thermally stimulated depolarization current measurements, electron spin resonance (EPR) have been used to characterize the dynamic heterogeneity in miscible polymer blends with or without hydrogen bonding interactions. No dynamic FTIR studies on the dynamic heterogeneity in miscible polymer blends have appeared so far.…”

A Faster Approach to Infrared Rheo-Optics Using a Planar Array Infrared Spectrograph

“…Among those probes, infrared spectroscopy is a tool of choice because it can simultaneously provide molecular information about the conformation and orientation of the different components of the system. 2 Infrared rheo-optics have been applied to study a wide range of samples, including homopolymers, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] polymer blends, 3,18,19 copolymers, [20][21][22][23][24][25][26][27] and biopolymers. 15,28 Marcott and coworkers first developed infrared rheo-optics using a dispersive infrared spectrometer 3,8,16,17,19,29 but, because of their multiplex advantage and high signal-to-noise ratio performance, Fourier transform infrared spectrometers (FT-IR) in the stepscan [13][14][15][16]18 or the asynchronous sampling modes 7,23,24 have now become standard instrumentation for infrared studies.…”