Effect of gamma irradiation on polypropylene yarns under air and water

Chang, Na-On; Eun, Hee-Chul; Won, Hoyoun; Kim, Seonbyeong; Seo, Bum-Kyoung; Kim, Yongsoo

doi:10.1007/s10967-021-08015-0

Cited by 1 publication

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the broken covalent bonds caused by high‐energy and strong penetrating γ‐ray irradiation, free radicals (evidenced by electron paramagnetic resonance spectrum in Figure S8, Supporting Information) with high chemical activity appear in the polymer and can react with oxygen to generate polar carbonyl and hydroxy groups. [ 38,39 ] X‐ray photoelectron spectroscopy (XPS) (Figures S9 and S10, Supporting Information) and energy dispersive spectroscopy (EDS, Figure S11, Supporting Information) also prove the existence of C═O and C ─ O bonds. The mechanical properties of pristine BOPP and γ‐irradiated BOPP films were measured, and the Young's modulus is increased by γ‐irradiation (Figure S12, Supporting Information), which is beneficial for reducing the possibility of electromechanical breakdown.…”

Section: Resultsmentioning

confidence: 99%

γ‐Ray Irradiation Significantly Enhances Capacitive Energy Storage Performance of Polymer Dielectric Films

Wang,

Bao,

Ding

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

Polymer dielectric capacitors are fundamental in advanced electronics and power grids but suffer from low energy density, hindering miniaturization of compact electrical systems. We show that high‐energy and strong penetrating γ‐irradiation significantly enhances capacitive energy storage performance of polymer dielectrics. γ‐irradiated biaxially oriented polypropylene (BOPP) films exhibit an extraordinarily high energy density of ∼10.4 J cm−3 at ∼968 MV m−1 with an efficiency of ∼97.3%. In particular, an energy density of ∼4.06 J cm−3 with an ultrahigh efficiency of ∼98% is reliably maintained through 20,000 charge‐discharge cycles under 600 MV m−1. At 125 °C, the γ‐irradiated BOPP film still delivers a high discharged energy density of ∼5.88 J cm−3 with an efficiency of ∼90% at ∼770 MV m−1. Substantial improvements are also achieved for γ‐irradiated cycloolefin copolymers at a high temperature of 150 °C, verifying the strategy generalizability. Experimental and theoretical analyses reveal that the excellent performance should be related to the γ‐irradiation induced polar functional groups with high electron affinity in the molecular chain, which offer deep energy traps to impede charge transport. This work provides a simple and generally applicable strategy for developing high‐performance polymer dielectrics.This article is protected by copyright. All rights reserved

show abstract

Section: Resultsmentioning

confidence: 99%