Giant negative electrocaloric effect measured by indirect method in X-ray irradiated P(VDF-TrFE) films

Bo,Li1; Bin,Yang2; Hong,Zhang3; Jiajia,Zhang1; Qianjin,Wang2; Weishu,Liu1

2023-09

10.1016/j.jmat.2023.09.001

Journal of Materiomics   影响因子和分区

2352-8478

2352-8486

Flexible solid-state cooling devices with high efficiency are attracted to ferroelectric polymers with excellent negative electrocaloric (EC) effects. It is challenging to obtain a large negative EC effect in ferroelectric polymers due to the lack of tunable techniques. A giant negative EC response was obtained in the poly(vinylidene fluoride-trifluoroethylene) copolymers (P(VDF-TrFE), 70/30, in mole ratio) irradiated with high-energy X-ray. The irradiated P(VDF-TrFE) films showed an adiabatic temperature change of −13.5 K at 40 MV/m under a dose of 5 Mrad (1 Mrad=10 J/kg) obtained by the indirect method. This significant negative EC effect is attributed to the enhancement of crystalline due to the entry of polymer molecules into the amorphous to crystalline structure and the reduction of heat capacity due to the increase of crosslinking. In addition, X-ray irradiation improves the dielectric coefficient from 15 to 22. This research indicates that irradiation can modify the negative EC properties of ferroelectric polymers for solid-state cooling.

Negative electrocaloric effects P(VDF-TrFE) films X-rays radiation

SCI

英语

第一

Elsevier BV

2-s2.0-85175256987

人工提交

1.Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
2.Yunnan Normal University, Yunnan Kunming 650500, China
3.China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 510610, China

Bo,Li,Bin,Yang,Hong,Zhang,et al. Giant negative electrocaloric effect measured by indirect method in X-ray irradiated P(VDF-TrFE) films[J]. Journal of Materiomics,2023,10(3):624-631.

Bo,Li,Bin,Yang,Hong,Zhang,Jiajia,Zhang,Qianjin,Wang,&Weishu,Liu.(2023).Giant negative electrocaloric effect measured by indirect method in X-ray irradiated P(VDF-TrFE) films.Journal of Materiomics,10(3),624-631.

Bo,Li,et al."Giant negative electrocaloric effect measured by indirect method in X-ray irradiated P(VDF-TrFE) films".Journal of Materiomics 10.3(2023):624-631.