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Title: Structure-induced switching of interpolymer adhesion at a solid–polymer melt interface

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c7sm02279d· OSTI ID:1423040
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [5]
  1. Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
  2. Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering. Dept. of Chemistry
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computational Sciences and Engineering Division

In this paper, we report a link between the interfacial structure and adhesive property of homopolymer chains physically adsorbed (i.e., via physisorption) onto solids. Polyethylene oxide (PEO) was used as a model and two different chain conformations of the adsorbed polymer were created on silicon substrates via the well-established Guiselin's approach: “flattened chains” which lie flat on the solid and are densely packed, and “loosely adsorbed polymer chains” which form bridges jointing up nearby empty sites on the solid surface and cover the flattened chains. We investigated the adhesion properties of the two different adsorbed chains using a custom-built adhesion testing device. Bilayers of a thick PEO overlayer on top of the flattened chains or loosely adsorbed chains were subjected to the adhesion test. The results revealed that the flattened chains do not show any adhesion even with the chemically identical free polymer on top, while the loosely adsorbed chains exhibit adhesion. Neutron reflectivity experiments corroborated that the difference in the interfacial adhesion is not attributed to the interfacial brodening at the free polymer–adsorbed polymer interface. Instead, coarse-grained molecular dynamics simulation results suggest that the tail parts of the loosely adsorbed chains act as “connector molecules”, bridging the free chains and substrate surface and improving the interfacial adhesion. Finally, these findings not only shed light on the structure–property relationship at the interface, but also provide a novel approach for developing sticking/anti-sticking technologies through precise control of the interfacial polymer nanostructures.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725; AC02-98CH10886; CMMI-1332499
OSTI ID:
1423040
Journal Information:
Soft Matter, Vol. 14, Issue 7; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (2)

Adsorption of charged macromolecules upon multicomponent responsive surfaces journal January 2018
Self-Organization of Triblock Copolymer Melt Chains Physisorbed on Non-neutral Surfaces journal December 2018

Figures / Tables (11)


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