Correlation of molecular orientation with adhesion at polystyrene/solid interfaces

Wilson, P. T.; Richter, Lee J.; Wallace, W.E.; Briggman, Kimberly A.; Stephenson, John C.

doi:10.1016/s0009-2614(02)01171-5

Cited by 61 publications

(90 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent experiments confirm that in thin polymer films chain segments may order [33] and in particular that certain orientations of the PS phenyl rings can be induced by the presence of interfaces [34], even in the absence of specific interactions: As demonstrated by nonlinear optical techniques such as sum-frequency generation spectroscopy, the interplay of intramolecular and intermolecular interactions causes the phenyl rings to point away from the bulk polymer film perpendicular to the polymer-air interface [35] and also towards a hydrophobic substrate [36].…”

Section: Discussionmentioning

confidence: 68%

Solid surface structure affects liquid order at the polystyrene–self-assembled-monolayer interface

et al. 2013

View full text Add to dashboard Cite

We present a combined x-ray and neutron reflectivity study characterizing the interface between polystyrene (PS) and silanized surfaces. Motivated by the large difference in slip velocity of PS on top of dodecyl-trichlorosilane (DTS) and octadecyl-trichlorosilane (OTS) found in previous studies, these two systems were chosen for the present investigation. The results reveal the molecular conformation of PS on silanized silicon. Differences in the molecular tilt of OTS and DTS are replicated by the adjacent phenyl rings of the PS. We discuss our findings in terms of a potential link between the microscopic interfacial structure and dynamic properties of polymeric liquids at interfaces.

show abstract

Section: Discussionmentioning

confidence: 68%

Solid surface structure affects liquid order at the polystyrene–self-assembled-monolayer interface

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The buried interface is difficult to probe with NEXAFS; however, VR-SFG studies on these polymers could be utilized to verify this hypothesis. For example, Wilson et al 76 showed that the PS phenyl ring orientation was away from the bulk polymer at both the film surface and buried interface of PS with spin-on glass. The results of this current paper may be generalizable to other surface organization phenomena, such as the packing of self-assembled monolayers, the organization of surface layers in organic devices, or the interfacial assembly of molecules with surfactant like character.…”

Section: Resultsmentioning

confidence: 99%

Surface Orientation of Polystyrene Based Polymers: Steric Effects from Pendant Groups on the Phenyl Ring

et al. 2012

View full text Add to dashboard Cite

Near edge X-ray absorption fine structure (NEXAFS) coupled with molecular dynamics simulations were utilized to probe the orientation at the exposed surface of the polymer film for polystyrene type polymers with various pendant functional groups off the phenyl ring. For all the polymers, the surface was oriented so that the rings are nominally normal to the film surface and pointing outward from the surface. The magnitude of this orientation was small and dependent on the size of the pendant functional group. Bulky functional groups hindered the surface orientation, leading to nearly unoriented surfaces. Depth dependent NEXAFS measurements demonstrated that the surface orientation was localized near the interface. Molecular dynamics simulations showed that the phenyl rings were not oriented strongly around a particular "average tilt angle". In contrast, simulations demonstrate that the phenyl rings exhibit a broad distribution of tilt angles, and that changes in the tilt angle distribution with pendant functionality give rise to the observed NEXAFS response. The more oriented samples exhibit a higher probability of phenyl ring orientation at angles greater than 60 degrees relative to the plane of the films surface.

show abstract

“…In a different study, a hydrophilic SOG surface was prepared via UV-ozone modification on a hydrophobic SOG surface. SFG studies on the PS/hydrophilic SOG interface showed that the interface had different structure than the PS/unmodified hydrophobic SOG interface [175]. Such structural differences can be correlated to different adhesion properties of the two interfaces.…”

Section: Buried Polymer/inorganic Solid and Polymer/polymer Interfmentioning

confidence: 99%

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Chen

2010

Progress in Polymer Science

153

144

View full text Add to dashboard Cite

This paper reviews recent progress in the studies of buried polymer interfaces using sum frequency generation (SFG) vibrational spectroscopy. Both buried solid/liquid and solid/solid interfaces involving polymeric materials are discussed. SFG studies of polymer/water interfaces show that different polymers exhibit varied surface restructuring behavior in water, indicating the importance of probing polymer/water interfaces in situ. SFG has also been applied to the investigation of interfaces between polymers and other liquids. It has been found that molecular interactions at such polymer/liquid interfaces dictate interfacial polymer structures. The molecular structures of silane molecules, which are widely used as adhesion promoters, have been investigated using SFG at buried polymer/silane and polymer/polymer interfaces, providing molecular-level understanding of polymer adhesion promotion. The molecular structures of polymer/solid interfaces have been examined using SFG with several different experimental geometries. These results have provided molecular-level information about polymer friction, adhesion, interfacial chemical reactions, interfacial electronic properties, and the structure of layer-by-layer deposited polymers. Such research has demonstrated that SFG is a powerful tool to probe buried interfaces involving polymeric materials, which are difficult to study by conventional surface sensitive analytical techniques.

show abstract

Correlation of molecular orientation with adhesion at polystyrene/solid interfaces

Cited by 61 publications

References 20 publications

Solid surface structure affects liquid order at the polystyrene–self-assembled-monolayer interface

Solid surface structure affects liquid order at the polystyrene–self-assembled-monolayer interface

Surface Orientation of Polystyrene Based Polymers: Steric Effects from Pendant Groups on the Phenyl Ring

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Contact Info

Product

Resources

About