Title
Chirality amplification of syndiotactic polystyrene induced circular dichroism chiral film in d form upon annealing
Author
Kai Zheng, Ruigang Liu, Hongliang Kang, Xia Gao, Deyan Shen, Yong Huang
Year
2011
Journal
Polymer
Abstract
The induced circular dichroism (ICD) syndiotactic polystyrene (sPS) chiral films in sPS δ phase were prepared and the chirality of the ICD sPS films upon annealing at different temperature was investigated. The sPS δ crystals in the ICD films transform into γ and then into α crystals as those of achiral sPS δ crystals during annealing at different temperature. The CD signal intensity at λ of 200 nm remains unchanged during the δ to γ crystalline transformation, but enhanced tremendously during the γ to α crystalline transformation. The amplification CD signal attributes to the closer package of the phenol rings in sPS α phase than that in sPS δ and γ phases. The lamellae grown at a temperature above the γ to α transition follow the chiral aggregation structure, which also contribute to the amplification of the CD signal.
Instrument
J-815
Keywords
Circular dichroism, Polymers, Thermal stability