Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 11, Pages 8754-8761Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am501557m
Keywords
contact charging; polymer films; ROMP; spiropyran; photochromism; triboelectric charging
Funding
- Xerox Foundation, an NSF [DMR-1151385]
- Tufts University
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1151385] Funding Source: National Science Foundation
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This paper describes the photochemical tuning of net charge that develops from contact electrification. The net charge separation and/or rate of charging of photochromic spiropyran (SP)-containing polymer films can be controlled by irradiation with UV light. The isomerization of the SP form to the more hydrophilic merocyanine (MC) by irradiation With UV light always leads to films that charge more positively than before irradiation. The incorporation of a halogenated comonomer into ring-opening metathesis polymerization (ROMP) yields films that charged negatively before irradiation so that a change in sign of the net charge separation of the film could be observed upon irradiation. An important advantage to our photochromic system is that light can be used to tune the charging behavior of the material, with spatial or temporal control of irradiation, leading to films that resist charging. Furthermore, the observed trends can be reversed by the exposure of the SP-containing polymer films to heat or visible light.
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