Chirality amplification of syndiotactic polystyrene induced circular dichroism chiral film in δ form upon annealing

Autor:	Hongliang Kang, Yong Huang, Kai Zheng, Deyan Shen, Xia Gao, Ruigang Liu
Rok vydání:	2011
Předmět:	Circular dichroism Materials science Polymers and Plastics Annealing (metallurgy) Organic Chemistry chemistry.chemical_compound Crystallography chemistry Tacticity Materials Chemistry Phenol Polystyrene Signal intensity Chirality (chemistry)
Zdroj:	Polymer. 52:3671-3676
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2011.06.007
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::428b28961a569bd7d0e94c4aa54b573d https://doi.org/10.1016/j.polymer.2011.06.007 Zobrazit plný text záznamu Full Text from ScienceDirect