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

被引：3

作者：

Benelli, Tiziana ^{[1
,2
,3
]}

Lanzi, Massimiliano ^{[1
,2
]}

Mazzocchetti, Laura ^{[1
,2
,3
]}

Giorgini, Loris ^{[1
,2
,3
]}

机构：

[1] Univ Bologna, Dipartimento Chim Ind Toso Montanari, Viale Risorgimento 4, I-40136 Bologna, Italy

[2] Univ Bologna, INSTM UdR Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy

[3] Univ Bologna, Interdept Ctr Ind Res Adv Applicat Mech Engn & Ma, Viale Risorgimento 2, I-40136 Bologna, Italy

来源：

NANOMATERIALS | 2017年 / 7卷 / 08期

关键词：

azobenzene containing-polymers; conformational chirality; chiral polymers; circular dichroism; chiral amplification; SIDE-CHAIN AZOBENZENE; CIRCULARLY-POLARIZED LIGHT; PHOTOCHROMIC METHACRYLIC POLYMERS; LIQUID-CRYSTALLINE POLYMERS; LANGMUIR-BLODGETT-FILMS; HELICAL POLYMER; CHIROPTICAL PROPERTIES; INDUCED BIREFRINGENCE; MOLECULAR-WEIGHT; MOIETIES;

D O I：

10.3390/nano7080208

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 T-g. 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.

引用

页数：15