Related Experiment Video
Updated: Jan 1, 2026
11:30
Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
12.1K
Radiation-Induced Transient Currents in Films of Poly(arylene ether ketone) Including Phthalide Moiety
Evgenii D Pozhidaev1, Vera V Shaposhnikova2, Alexey R Tameev1,3
1National Research University Higher School of Economics, 101000 Moscow, Russia.
Polymers
|December 22, 2019
Summary
Poly(arylene ether ketone) copolymers exhibit radiation-induced conductivity, showing isolated charge carrier transport. These materials resist electrostatic discharges, making them suitable for protective coatings in electronic devices.
Area of Science:
- Materials Science
- Polymer Science
- Electrical Engineering
Background:
- Poly(arylene ether ketone) copolymers (co-PAEKs) are advanced polymers with potential applications in electronics.
- Understanding their electrical properties under radiation is crucial for device protection.
Purpose of the Study:
- To investigate the electrical properties of co-PAEKs with varying phthalide content using radiation-induced conductivity (RIC).
- To evaluate charge carrier transport mechanisms and resistance to electrostatic discharge.
Main Methods:
- Thin films of co-PAEKs (3, 5, 50 mol% phthalide) were subjected to electron pulses (3-50 keV) under electric fields (5-40 V/μm).
- Radiation-induced conductivity (RIC) measurements, transient current, and current-voltage (I-V) characteristics were analyzed.
- The Rose-Fowler-Vaisberg model was applied to analyze RIC data and charge carrier transport.
Main Results:
- Charge carriers moved independently, and the applied fields did not trigger switching effects.
- Super-linear I-V characteristics indicated high resistance to electrostatic discharges caused by ionizing radiation.
- Phthalide content influenced the electrical properties and radiation resistance.
Conclusions:
- Co-PAEKs demonstrate robust electrical properties under radiation exposure.
- Their resistance to electrostatic discharge makes them promising for protective coatings in electronic devices.
- Further research can optimize phthalide content for enhanced radiation shielding applications.
Related Concept Videos
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
9.2K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
9.2K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.1K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.1K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.4K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.4K
01:27π Electron Effects on Chemical Shift: Overview
1.5K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.5K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
1.7K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.7K