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Article

Chirality on Amorphous High-Tg Polymeric Nanofilms: Optical Activity Amplification by Thermal Annealing

1
Dipartimento di Chimica Industriale Toso Montanari and INSTM UdR-Bologna, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
2
Interdepartmental Center for Industrial Research on Advanced Applications in Mechanical Engineering and Materials Technology (CIRI-MAM), University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2017, 7(8), 208; https://doi.org/10.3390/nano7080208
Received: 7 June 2017 / Revised: 10 July 2017 / Accepted: 27 July 2017 / Published: 1 August 2017
(This article belongs to the Special Issue Frontiers in Chiral Nanomaterials)
The chiroptical properties of amorphous chiral polymers functionalized with conjugated trans-azoaromatic chromophore linked to the backbone through a chiral cyclic pyrrolidine moiety of one single configuration at the solid state, as thin films, were investigated. For the first time nanometric thin films of amorphous polymers (not liquid crystals) showed a remarkable chiral amplification upon thermal treatment at a temperature close to their Tg. The side-chain azobenzene chromophores rearrangement driven by the enhanced chain mobility seems to favor the formation of nanodomains of conformationally ordered macromolecular chains with one prevailing helical handedness whose optical activity depends on the configuration of the intrinsic chirality of the monomeric units and which as a result are stable at room temperature for a long time. View Full-Text
Keywords: azobenzene containing-polymers; conformational chirality; chiral polymers; circular dichroism; chiral amplification azobenzene containing-polymers; conformational chirality; chiral polymers; circular dichroism; chiral amplification
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MDPI and ACS Style

Benelli, T.; Lanzi, M.; Mazzocchetti, L.; Giorgini, L. Chirality on Amorphous High-Tg Polymeric Nanofilms: Optical Activity Amplification by Thermal Annealing. Nanomaterials 2017, 7, 208. https://doi.org/10.3390/nano7080208

AMA Style

Benelli T, Lanzi M, Mazzocchetti L, Giorgini L. Chirality on Amorphous High-Tg Polymeric Nanofilms: Optical Activity Amplification by Thermal Annealing. Nanomaterials. 2017; 7(8):208. https://doi.org/10.3390/nano7080208

Chicago/Turabian Style

Benelli, Tiziana, Massimiliano Lanzi, Laura Mazzocchetti, and Loris Giorgini. 2017. "Chirality on Amorphous High-Tg Polymeric Nanofilms: Optical Activity Amplification by Thermal Annealing" Nanomaterials 7, no. 8: 208. https://doi.org/10.3390/nano7080208

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