Interpenetration of chemically identical polymer onto grafted substrates

Hoyeon Lee, Seongjun Jo, Toyoaki Hirata, Norifumi L. Yamada, Keiji Tanaka, Eunkyoung Kim, Du Yeol Ryu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Interpenetrating interfaces between a deuterated polystyrene (dPS) and the grafted substrates with the same chemical identity were characterized using neutron reflectivity (NR) measurements, where the PS-grafted substrates were prepared using a grafting-to approach with hydroxyl end-functionalized polystyrene (PSOH) in a dry brush regime. The characteristic brush thickness (h) and grafting density (σ) of PS-grafted layers were determined based on the chain length (or molecular weight, Mn) of PSOHs. The experimental interpenetration length (ξ) was measured at the interfaces, and the limiting plateau in ξ above which the value was independent of film thickness shifted toward higher values as the Mn of PSOH increased. Normalization by the deformed brush thickness (hd) of PS-grafted layer after interpenetration revealed that the experimental value of ξ/hd in a short and dense PS-grafted substrate, prepared with a low-molecular-weight PSOH, deviated markedly from the theoretical value, indicating significant additional stretching of the grafted chains to accommodate inter-mixing with the dPS chains.

Original languageEnglish
Pages (from-to)70-75
Number of pages6
Journalpolymer
Volume74
DOIs
Publication statusPublished - Aug 14 2015

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Polystyrenes
Brushes
Polymers
Substrates
Molecular weight
Chain length
Hydroxyl Radical
Stretching
Film thickness
Neutrons

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Interpenetration of chemically identical polymer onto grafted substrates. / Lee, Hoyeon; Jo, Seongjun; Hirata, Toyoaki; Yamada, Norifumi L.; Tanaka, Keiji; Kim, Eunkyoung; Ryu, Du Yeol.

In: polymer, Vol. 74, 14.08.2015, p. 70-75.

Research output: Contribution to journalArticle

Lee, Hoyeon ; Jo, Seongjun ; Hirata, Toyoaki ; Yamada, Norifumi L. ; Tanaka, Keiji ; Kim, Eunkyoung ; Ryu, Du Yeol. / Interpenetration of chemically identical polymer onto grafted substrates. In: polymer. 2015 ; Vol. 74. pp. 70-75.
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AU - Kim, Eunkyoung

AU - Ryu, Du Yeol

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