Altering surface fluctuations by blending tethered and untethered chains

Soft Matter
J K LeeMark D Foster

Abstract

"Partially tethering" a thin film of a polymer melt by covalently attaching to the substrate a fraction of the chains in an unentangled melt dramatically increases the relaxation time of the surface height fluctuations. This phenomenon is observed even when the film thickness, h, is 20 times the unperturbed chain radius, Rg,tethered, of the tethered chains, indicating that partial tethering is more influential than any physical attraction with the substrate. Furthermore, a partially tethered layer of a low average molecular weight of 5k showed much slower surface fluctuations than did a reference layer of pure untethered chains of much greater molecular weight (48k), so the partial tethering effect is stronger than the effects of entanglement and increase in glass transition temperature, Tg, with molecular weight. Partial tethering offers a means of tailoring these fluctuations which influence wetting, adhesion, and tribology of the surface.

References

Apr 22, 1991·Physical Review Letters·I M TidswellS D Kosowsky
Mar 14, 2003·Physical Review Letters·Hyunjung KimS K Sinha
Aug 7, 2007·Physical Review Letters·Zhang JiangS K Sinha
Dec 31, 2008·Physical Review Letters·Zhang JiangSunil K Sinha
Apr 2, 2009·The Journal of Chemical Physics·A K KandarS Narayanan
Apr 7, 2010·Physical Review Letters·Tadanori KogaS K Sinha
Dec 21, 2011·Physical Review Letters·Tadanori KogaS K Sinha
Feb 2, 2013·Physical Review Letters·Peter GinTadanori Koga
Aug 27, 2013·Physical Review Letters·Shih-fan WangMark D Foster
Oct 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Taiki HoshinoAtsushi Takahara
Jul 8, 2015·ACS Nano·Jayanta Kumar BalAlain Gibaud
May 26, 2016·Soft Matter·Gökçe UğurMark D Foster
Jun 3, 2017·The Journal of Chemical Physics·Chia-Chun LinRussell J Composto

❮ Previous
Next ❯

Methods Mentioned

BETA
X-ray
neutron scattering

Software Mentioned

Watcom

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
S W SidesM J Stevens
Langmuir : the ACS Journal of Surfaces and Colloids
Ranjan D Deshmukh, Russell J Composto
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Chi-Hang Lam, Ophelia K C Tsui
© 2022 Meta ULC. All rights reserved