Abstract
The local conformation of polystyrene (PS) and deuterated PS at the interface with quartz substrates, which were covered with phenyl groups using phenyltrimethoxysilane (PTS) under various conditions, was examined by sum frequency generation spectroscopy. As evidenced by the red-shift of the wavenumber of the v2 vibration mode for phenyl groups, it was claimed that PTS phenyl groups standing vertically from the quartz surface induced the perpendicular orientation of PS phenyl rings by energetically favorable parallel-displaced π-π interactions at the interface. The local conformation of PS chains strongly anchored onto the substrate by the π-π interactions remained almost unchanged for 48 h even at a temperature 60 K higher than the bulk glass transition temperature. That is, the interfacial π-π interactions facilitated the adsorption of PS chains on the substrate to attain a large enthalpic gain, resulting in significantly slower dynamics of PS chains at the interface. Our results illustrate the importance of the interfacial noncovalent interactions in controlling the structure and dynamics of macromolecular chains at the interface as well as in the thin film geometry.
| Original language | English |
|---|---|
| Pages (from-to) | 5620-5627 |
| Number of pages | 8 |
| Journal | Macromolecules |
| Volume | 51 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Aug 14 2018 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
Cite this
Enhanced Thermal Stability of Polystyrene by Interfacial Noncovalent Interactions. / Hong, Yongming; Li, Yawei; Wang, Fengliang; Zuo, Biao; Wang, Xinping; Zhang, Li; Kawaguchi, Daisuke; Tanaka, Keiji.
In: Macromolecules, Vol. 51, No. 15, 14.08.2018, p. 5620-5627.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Enhanced Thermal Stability of Polystyrene by Interfacial Noncovalent Interactions
AU - Hong, Yongming
AU - Li, Yawei
AU - Wang, Fengliang
AU - Zuo, Biao
AU - Wang, Xinping
AU - Zhang, Li
AU - Kawaguchi, Daisuke
AU - Tanaka, Keiji
PY - 2018/8/14
Y1 - 2018/8/14
N2 - The local conformation of polystyrene (PS) and deuterated PS at the interface with quartz substrates, which were covered with phenyl groups using phenyltrimethoxysilane (PTS) under various conditions, was examined by sum frequency generation spectroscopy. As evidenced by the red-shift of the wavenumber of the v2 vibration mode for phenyl groups, it was claimed that PTS phenyl groups standing vertically from the quartz surface induced the perpendicular orientation of PS phenyl rings by energetically favorable parallel-displaced π-π interactions at the interface. The local conformation of PS chains strongly anchored onto the substrate by the π-π interactions remained almost unchanged for 48 h even at a temperature 60 K higher than the bulk glass transition temperature. That is, the interfacial π-π interactions facilitated the adsorption of PS chains on the substrate to attain a large enthalpic gain, resulting in significantly slower dynamics of PS chains at the interface. Our results illustrate the importance of the interfacial noncovalent interactions in controlling the structure and dynamics of macromolecular chains at the interface as well as in the thin film geometry.
AB - The local conformation of polystyrene (PS) and deuterated PS at the interface with quartz substrates, which were covered with phenyl groups using phenyltrimethoxysilane (PTS) under various conditions, was examined by sum frequency generation spectroscopy. As evidenced by the red-shift of the wavenumber of the v2 vibration mode for phenyl groups, it was claimed that PTS phenyl groups standing vertically from the quartz surface induced the perpendicular orientation of PS phenyl rings by energetically favorable parallel-displaced π-π interactions at the interface. The local conformation of PS chains strongly anchored onto the substrate by the π-π interactions remained almost unchanged for 48 h even at a temperature 60 K higher than the bulk glass transition temperature. That is, the interfacial π-π interactions facilitated the adsorption of PS chains on the substrate to attain a large enthalpic gain, resulting in significantly slower dynamics of PS chains at the interface. Our results illustrate the importance of the interfacial noncovalent interactions in controlling the structure and dynamics of macromolecular chains at the interface as well as in the thin film geometry.
UR - http://www.scopus.com/inward/record.url?scp=85051566612&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051566612&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.8b01012
DO - 10.1021/acs.macromol.8b01012
M3 - Article
AN - SCOPUS:85051566612
VL - 51
SP - 5620
EP - 5627
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 15
ER -