Folded Chain Lamellae of Dynamic Helical Poly(phenylacetylene) in the Hexagonal Columnar Phase
Folded Chain Lamellae of Dynamic Helical Poly(phenylacetylene) in the Hexagonal Columnar Phase
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六方柱相动态螺旋聚苯乙炔的折叠链片层
DOI:
10.1021/acs.macromol.1c00818
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发表时间:
2021-06
期刊:
影响因子:
5.5
通讯作者:
Chen E. Q.
中科院分区:
文献类型:
--
作者:
Zhang Y. F.;Chen X.;Yu X. S.;Chen J. X.;Hu M. Q.;Zheng B. Y.;Liu Y. X.;Yang S.;Chen E. Q.
: Long-chain molecules can self-assemble into ordered and functional structures through chain folding. In crystalline polymers, chain folding leads to lamellar crystals that are extremely important to the ultimate properties. Understanding chain folding at the molecular level remains a great challenge. Here, we report that a dynamic helical cis -poly(phenylacetylene) bearing a bulky side group ( P1 ), which is a side-chain liquid crystalline polymer, can also form folded chain lamellae in the hexagonal columnar phase. Our atomic force microscopy (AFM) experiments on P1 thin fi lms directly visualized the adjacent and nonadjacent folds at the liquid crystal − amorphous interface. While the helical segments of P1 with a diameter of 2.2 nm closely pack in the hexagonal lattice, the disorder strands that connect the helices could compose the folds. Furthermore, we monitored the lamellar growth from the amorphous state using AFM. We demonstrate experimentally for the fi rst time that the lamellar growth may obey the kinetics of Ostwald ripening. It is also found that with the initial lamellar thickness close to the persistence length of P1 , the lamellae show simultaneous lateral extension and thickening.
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