Anomalous Confinement Slows Surface Fluctuations of Star Polymer Melt Films

Fan Zhang; Qiming He; Yang Zhou; Suresh Narayanan; Chao Wang; Bryan D. Vogt; Mark D. Foster

doi:10.1021/acsmacrolett.8b00278

Anomalous Confinement Slows Surface Fluctuations of Star Polymer Melt Films

Fan Zhang
, Qiming He
, Yang Zhou
, Suresh Narayanan
, Chao Wang
, Bryan D. Vogt
, Mark D. Foster

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The unusually large film thickness at which confinement effects manifest themselves in surface fluctuations of unentangled four-arm star polymers has been defined using film thicknesses from 10R_g to 107R_g. For 15k four-arm star polystyrene (SPS), confinement appears at a thickness between 112 nm (40R_g) and 72 nm (26R_g), which is remarkably larger than the thicknesses at which confinement appears for unentangled 6k linear (<15 nm, <7R_g) and 6k and 14k cyclic (24 and 22 nm, respectively) polystyrenes. Data for 15k star films can be rationalized using a two-layer model with a 17 nm (6R_g) thick highly viscous layer at the substrate, which is significantly thicker than the 1R_g thick "irreversibly adsorbed" layer. For a 29 nm (10R_g) thick film, more striking confinement occurs due to the combined influence of both interfaces. These results underscore the extraordinary role long-chain branching plays in dictating surface fluctuations of thin films.

Original language	English (US)
Pages (from-to)	834-839
Number of pages	6
Journal	ACS Macro Letters
Volume	7
Issue number	7
DOIs	https://doi.org/10.1021/acsmacrolett.8b00278
State	Published - Jul 17 2018

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1021/acsmacrolett.8b00278

Cite this

@article{9b046f0754094280981500ee52e99f24,

title = "Anomalous Confinement Slows Surface Fluctuations of Star Polymer Melt Films",

abstract = "The unusually large film thickness at which confinement effects manifest themselves in surface fluctuations of unentangled four-arm star polymers has been defined using film thicknesses from 10Rg to 107Rg. For 15k four-arm star polystyrene (SPS), confinement appears at a thickness between 112 nm (40Rg) and 72 nm (26Rg), which is remarkably larger than the thicknesses at which confinement appears for unentangled 6k linear (<15 nm, <7Rg) and 6k and 14k cyclic (24 and 22 nm, respectively) polystyrenes. Data for 15k star films can be rationalized using a two-layer model with a 17 nm (6Rg) thick highly viscous layer at the substrate, which is significantly thicker than the 1Rg thick {"}irreversibly adsorbed{"} layer. For a 29 nm (10Rg) thick film, more striking confinement occurs due to the combined influence of both interfaces. These results underscore the extraordinary role long-chain branching plays in dictating surface fluctuations of thin films.",

author = "Fan Zhang and Qiming He and Yang Zhou and Suresh Narayanan and Chao Wang and Vogt, \{Bryan D.\} and Foster, \{Mark D.\}",

note = "Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = jul,

day = "17",

doi = "10.1021/acsmacrolett.8b00278",

language = "English (US)",

volume = "7",

pages = "834--839",

journal = "ACS Macro Letters",

issn = "2161-1653",

publisher = "American Chemical Society",

number = "7",

}

TY - JOUR

T1 - Anomalous Confinement Slows Surface Fluctuations of Star Polymer Melt Films

AU - Zhang, Fan

AU - He, Qiming

AU - Zhou, Yang

AU - Narayanan, Suresh

AU - Wang, Chao

AU - Vogt, Bryan D.

AU - Foster, Mark D.

PY - 2018/7/17

Y1 - 2018/7/17

N2 - The unusually large film thickness at which confinement effects manifest themselves in surface fluctuations of unentangled four-arm star polymers has been defined using film thicknesses from 10Rg to 107Rg. For 15k four-arm star polystyrene (SPS), confinement appears at a thickness between 112 nm (40Rg) and 72 nm (26Rg), which is remarkably larger than the thicknesses at which confinement appears for unentangled 6k linear (<15 nm, <7Rg) and 6k and 14k cyclic (24 and 22 nm, respectively) polystyrenes. Data for 15k star films can be rationalized using a two-layer model with a 17 nm (6Rg) thick highly viscous layer at the substrate, which is significantly thicker than the 1Rg thick "irreversibly adsorbed" layer. For a 29 nm (10Rg) thick film, more striking confinement occurs due to the combined influence of both interfaces. These results underscore the extraordinary role long-chain branching plays in dictating surface fluctuations of thin films.

AB - The unusually large film thickness at which confinement effects manifest themselves in surface fluctuations of unentangled four-arm star polymers has been defined using film thicknesses from 10Rg to 107Rg. For 15k four-arm star polystyrene (SPS), confinement appears at a thickness between 112 nm (40Rg) and 72 nm (26Rg), which is remarkably larger than the thicknesses at which confinement appears for unentangled 6k linear (<15 nm, <7Rg) and 6k and 14k cyclic (24 and 22 nm, respectively) polystyrenes. Data for 15k star films can be rationalized using a two-layer model with a 17 nm (6Rg) thick highly viscous layer at the substrate, which is significantly thicker than the 1Rg thick "irreversibly adsorbed" layer. For a 29 nm (10Rg) thick film, more striking confinement occurs due to the combined influence of both interfaces. These results underscore the extraordinary role long-chain branching plays in dictating surface fluctuations of thin films.

UR - https://www.scopus.com/pages/publications/85050204967

UR - https://www.scopus.com/pages/publications/85050204967#tab=citedBy

U2 - 10.1021/acsmacrolett.8b00278

DO - 10.1021/acsmacrolett.8b00278

M3 - Article

C2 - 35650756

AN - SCOPUS:85050204967

SN - 2161-1653

VL - 7

SP - 834

EP - 839

JO - ACS Macro Letters

JF - ACS Macro Letters

IS - 7

ER -

Anomalous Confinement Slows Surface Fluctuations of Star Polymer Melt Films

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this