Directed crystallization of isotactic poly(2-vinylpyridine) for preferred lamellar twisting by chiral dopants

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題名:	Directed crystallization of isotactic poly(2-vinylpyridine) for preferred lamellar twisting by chiral dopants
作者:	王孝方;Wen, Tao;Wang, Hsiao-Fang;Mao, Yung-Cheng;Chuang, Wei-Tsung;Tsai, Jing-Cherng;Ho, Rong-Ming
貢獻者:	工學院化學工程與材料工程學系
關鍵詞:	Chemical elements;Chirality;Circular dichroism;Circularity;Cotton;Crystallization;Dichroism;Dopants;Electron diffraction;Handedness;Isotactic;Isotacticity;Lamellae;Poly(2-vinylpyridine);Polyvinyl chloride;Polyvinyl pyridine;Spectroscopy;Spherulite;Spherulites;Studies
日期:	2016-12-19
上傳時間:	2026-04-21 14:57:42 (UTC+8)
出版者:	Elsevier BV;Kidlington: Elsevier Ltd
摘要:	摘要： As reported in our previous work, banded spherulites of isotactic poly(2-vinylpyridine) (iP2VP) with preferred handedness of twisted lamellae can be formed by the inducement of chiral dopants, i.e., (R)- or (S)-hexahydromandelic acids (HMAs). In the present work, we systematically studied the behaviors of chirality transfer in the crystallization of iP2VP associated with the chiral dopant. As evidenced by the signatures of the split-type Cotton effect of circular dichroism (CD) spectra, the chains of iP2VP exhibit exclusive conformational chirality, i.e., induced circular dichroism (ICD), due to the complexation of chiral dopants (configurational chirality) with the lone-pair electron of the iP2VP. With the same growth axis along the radial direction of the banded spherulites, as indicated by selected area electron diffraction (SAED), the helical sense of the twisted lamellae of the iP2VP with ICD can be driven by the chiral dopants. The handedness of the helical chains remains after crystallization with intrinsic crystalline structure of iP2VP, which was revealed by the corresponding results of CD spectroscopy. As a result, a homochiral evolution from the configurational chirality of chiral dopant to the hierarchical chirality of crystallized iP2VP can be developed through directed crystallization of the iP2VP by chiral HMAs. [Display omitted] •Systematical study on the directed crystallization of isotactic poly(2-vinylpyridine) by chiral dopants.•Banded spherulites of iP2VP with preferred handedness are induced by (R)- and (S)-HMAs through chirality transfer.•The handedness of the lamellae in the banded spherulites of iP2VP is controlled by the induced chain conformation. 出版者： Kidlington: Elsevier Ltd 出版日期： 2016-12-19 出處： Polymer (Guilford), 2016-12, Vol.107, p.44-53 版權： 2016 Elsevier Ltd 版權： Copyright Elsevier BV Dec 19, 2016 識別號： ISSN: 0032-3861 識別號： EISSN: 1873-2291 識別號： DOI: 10.1016/j.polymer.2016.11.016
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

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