title: A Novel Mechanochromic and Photochromic Polymer Film: When Rhodamine Joins Polyurethane.
abstract: A rhodamine-based molecule, Rh-OH, is synthesized. Rh-OH exhibits a reversible mechanochromic luminescent character but a passivating response to UV light. An elastomeric polymer film based on polyurethane with embedded Rh-OH is prepared via a polycondensation reaction. The film shows mechanochromic and photochromic properties with reversible color change, which originates from the isomerization of the Rh-OH molecule from a twisted spirolactam in the ring-closed form to a planarized zwitterionic structure in the ring-open state.
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Zejun
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Yiyang
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Yen
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Xinru
authors.initials: X
authors.lastname: Jia
keywords: crosslinking; mechanochromism; photochromism; polymer film; rhodamine derivative