Strategies to stabilize the photoinduced supramolecular chirality in azobenzene liquid crystalline polymers

Royes, J. ; Oriol, L. (Universidad de Zaragoza) ; Tejedor, R. M. (Universidad de Zaragoza) ; Piñol, M. (Universidad de Zaragoza)

Resumen: This paper describes the synthesis, thermal characterization and optical properties of liquid crystalline homopolymers and block copolymers with a repeating unit consisting of two functional units, with at least one of them being an azobenzene. Films of these polymers have been irradiated with circularly polarized light at room temperature, evaluating the intensity of the photoinduced chiral signal and its temporal stability upon storage. The paper also explores two different strategies to restrict the relaxation of the photoinduced order. Firstly, block copolymers have been prepared to confine the photoaddressable segments into nanoscopic domains where relaxation should be restricted. Secondly, an alternative homopolymer has been synthesized where the repeating unit combines two chromophores that can be separately photoaddressed, an azobenzene unit to efficiently photoinduce chirality and a cinnamate to fix the chiral signal by photocrosslinking.

Idioma: Inglés

DOI: 10.3390/polym11050885

Año: 2019

Publicado en: POLYMERS 11, 5 (2019), 885 [16 pp]
ISSN: 2073-4360

Factor impacto JCR: 3.426 (2019)

Categ. JCR: POLYMER SCIENCE rank: 16 / 89 = 0.18 (2019) - Q1 - T1

Factor impacto SCIMAGO: 0.704 - Polymers and Plastics (Q1) - Chemistry (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/FEDER
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-84838-P

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)