Preparation of High-Density Polymer Brushes with a Multihelical Structure

It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndio...

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Veröffentlicht in:	Langmuir : the ACS journal of surfaces and colloids. - 1985. - 34(2018), 10 vom: 13. März, Seite 3283-3288
1. Verfasser:	Kato, Tomoki (VerfasserIn)
Weitere Verfasser:	Sato, Masanao, Shimamoto, Hitoshi, Uno, Kiyu, Yokomachi, Kazutoshi, Konishi, Yuko, Kamitani, Kazutaka, Nishibori, Maiko, Ohta, Noboru, Ishige, Ryohei, White, Kevin L, Otozawa, Nobuyuki, Hirai, Tomoyasu, Takahara, Atsushi
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2018
Zugriff auf das übergeordnete Werk:	Langmuir : the ACS journal of surfaces and colloids
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't

Beschreibung
Zusammenfassung:	It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation
Beschreibung:	Date Completed 10.09.2018 Date Revised 10.09.2018 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1520-5827
DOI:	10.1021/acs.langmuir.7b04167