Primary Nucleation in Metastable Solutions of Poly(3-hexylthiophene)
Primary Nucleation in Metastable Solutions of Poly(3-hexylthiophene)
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聚(3-己基噻吩)亚稳态溶液中的初级成核
DOI:
10.1021/acs.macromol.1c02193
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发表时间:
2022-04
期刊:
影响因子:
5.5
通讯作者:
Günter Reiter
中科院分区:
文献类型:
--
作者:
Tianyu Wu;Sivasurender Ch;ran;Yao Zhang;Tianze Zheng;Thomas Pfohl;Jun Xu;Günter Reiter
Because of its smallness and low probability of formation, the determination of the size of the critical primary nucleus represents a great challenge in polymer crystallization. We are still missing a feasible approach providing experimental access to primary nucleation. In this work, we investigated the dependence of the incubation time on the degree of supersaturation for a well-defined metastable regime of a prototypical conjugated polymer, i.e., poly(3-hexylthiophene). On the basis of Kashchiev’s nucleation theorem and verified by a simulation model for primary nucleation based on the kinetics of attaching and detaching crystalline units, we deduced the number of crystalline units within the critical nucleus, which, for the investigated parameter range, was found to be independent of the degree of supersaturation. Thus, we conclude that classical nucleation theory, which predicts an increase of the size of critical nuclei with decreasing degree of supersaturation, may be not valid for weakly supersaturated solutions.
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