4.4 Article

Alternating chain sequence weakening of interfacial molecular interactions enhances the Tg confinement effect of polymers

Related references

Note: Only part of the references are listed.
Article Chemistry, Multidisciplinary

Optical Imaging of the Molecular Mobility of Single Polystyrene Nanospheres

Shasha Liu et al.

Summary: This study proposes a thermal-optical imaging technique to determine the glass transition and rubber-fluid transition temperatures of single isolated polystyrene nanospheres for the first time. The experiments reveal the influence of the substrate on the glass transition temperature and the existence of a surface layer with enhanced molecular mobility.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

Review Physics, Applied

Surface dynamics of glasses

Houkuan Tian et al.

Summary: This article introduces the importance and development of research on the dynamics of glass surfaces, as well as its potential impact on material design.

APPLIED PHYSICS REVIEWS (2022)

Article Polymer Science

Interfacial reaction of a maleic anhydride grafted polyolefin with ethylene vinyl alcohol copolymer at the buried solid/solid interface

John S. Andre et al.

Summary: The research utilized sum frequency generation (SFG) vibrational spectroscopy to study chemical interactions at buried interfaces between two polymers, demonstrating that SFG can non-destructively probe chemical reactions at buried interfaces in real-time. These interfacial reactions are crucial for enhancing the functionality and properties of polymer/polymer interfaces.

POLYMER (2021)

Article Polymer Science

Decoupling Role of Film Thickness and Interfacial Effect on Polymer Thin Film Dynamics

Quanyin Xu et al.

Summary: Thin film dynamics can be influenced by both thickness and interfacial effects, affecting parameters such as glass transition temperature (T-g) and expansivity (beta). However, the ability to modulate beta differs significantly between thickness and interface perturbations, leading to variations in thin film properties even when T-g remains constant.

ACS MACRO LETTERS (2021)

Article Polymer Science

Enhanced Free Surface Mobility Facilitates the Release of FreeVolume Holes in Thin-Film Polymer Glasses

Hao Zha et al.

Summary: This study assessed hole diffusion dynamics in glassy thin poly (ethylene terephthalate) films and elucidated the apparent activation energy for hole diffusion by modeling the correlation between glass transition temperature and surface coverage of crystals. The results showed a linear decrease in activation energy with increasing inverse film thickness, indicating that free surface dynamics promote hole diffusion in thin films. This finding suggests that confined polymer dynamics in thin films can be modulated by changing the free surface properties.

MACROMOLECULES (2021)

Article Chemistry, Multidisciplinary

Ultrastable Glassy Polymer Films with an Ultradense Brush Morphology

Biao Zuo et al.

Summary: This study demonstrates that polymer brushes with ultrahigh grafting density exhibit significantly improved thermal stability, overcoming confinement and interfacial effects to control thin-film material properties. The dense packing and molecular ordering in the amorphous state of ultradense brushes prepared by surface-initiated atom transfer radical polymerization in combination with a self-assembled monolayer of initiators play a crucial role in enhancing the thermal stability of polymer films.

ACS NANO (2021)

Article Multidisciplinary Sciences

Mobility gradients yield rubbery surfaces on top of polymer glasses

Zhiwei Hao et al.

Summary: Many emerging materials, such as ultrastable glasses, owe their properties to a gradient of enhanced mobility at the surface of glass-forming liquids. This surface mobility enhancement has reshaped our understanding of glass formers behavior, especially in polymeric glasses with a two-scale nature of glassy polymer surfaces. The emergence of a transient rubbery surface behavior in polymers with short chains is driven by superposed gradients in segmental dynamics and chain conformational statistics, leading to a breakdown in time-temperature superposition.

NATURE (2021)

Article Multidisciplinary Sciences

Nature of dynamic gradients, glass formation, and collective effects in ultrathin freestanding films

Asieh Ghanekarade et al.

Summary: This study investigates the influence of nanoscale confinement on the dynamics and glass transition temperature of nano-liquids. By combining molecular dynamics simulations and the ECNLE theory, the research reveals the dynamical features in films of different thicknesses, as well as the alterations in the structural relaxation process induced by interface-nucleated gradients and finite size effects.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2021)

Review Polymer Science

Relaxation behavior of polymer thin films: Effects of free surface, buried interface, and geometrical confinement

Bolin Li et al.

Summary: This review systematically examines the effects of free surface, buried interface, and geometrical confinement on the relaxation behavior of polymer thin films using poly(methyl methacrylate) (PMMA) and polystyrene (PS) as examples. The study also discusses the universal effects of hard and soft confinements and adsorbed nanolayers near a substrate on the glass transition temperature (T-g) of these films. The systematic knowledge presented in the review will aid in the future design of polymer thin films with desired properties for a variety of applications.

PROGRESS IN POLYMER SCIENCE (2021)

Review Polymer Science

Physical Properties of Polymers Under Soft and Hard Nanoconfinement: A Review

Ming-Chao Ma et al.

CHINESE JOURNAL OF POLYMER SCIENCE (2020)

Article Physics, Multidisciplinary

Effect of Local Chain Conformation in Adsorbed Nanolayers on Confined Polymer Molecular Mobility

Biao Zuo et al.

PHYSICAL REVIEW LETTERS (2019)

Article Polymer Science

Segmental Relaxation Dynamics of the Core and Corona in a Single Dry Micelle

Weizhao Ren et al.

MACROMOLECULES (2018)

Article Chemistry, Physical

Evidence of a Transition Layer between the Free Surface and the Bulk

Wojciech Ogieglo et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2018)

Article Polymer Science

Enhanced Thermal Stability of Polystyrene by Interfacial Noncovalent Interactions

Yongming Hong et al.

MACROMOLECULES (2018)

Article Materials Science, Ceramics

Quantitative explanation of the enhancement of surface mobility of the metallic glass Pd40Cu30Ni10P20 by the Coupling Model

K. L. Ngai et al.

JOURNAL OF NON-CRYSTALLINE SOLIDS (2017)

Review Physics, Multidisciplinary

Glass transition of polymers in bulk, confined geometries, and near interfaces

Simone Napolitano et al.

REPORTS ON PROGRESS IN PHYSICS (2017)

Article Chemistry, Multidisciplinary

Scaled down glass transition temperature in confined polymer nanofibers

Hongxia Wang et al.

NANOSCALE (2016)

Article Chemistry, Physical

Influence of casting solvent on phenyl ordering at the surface of spin cast polymer thin films

John N. Myers et al.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2014)

Article Multidisciplinary Sciences

A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer

Y. Chai et al.

SCIENCE (2014)

Article Chemistry, Physical

Fragility of an Isochorically Confined Polymer Glass

Chuan Zhang et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2013)

Article Chemistry, Analytical

Observation of sub-surface phenyl rings in polystyrene with vibrationally resonant sum-frequency generation

Alexander D. Curtis et al.

VIBRATIONAL SPECTROSCOPY (2013)

Article Chemistry, Multidisciplinary

Heterogeneous Diffusion in Thin Polymer Films As Observed by High-Temperature Single-Molecule Fluorescence Microscopy

Bente M. I. Flier et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2012)

Article Polymer Science

Local Conformation and Relaxation of Polystyrene at Substrate Interface

Hirofumi Tsuruta et al.

MACROMOLECULES (2012)

Article Physics, Multidisciplinary

Reduced Glass Transition Temperatures in Thin Polymer Films: Surface Effect or Artifact?

O. Baeumchen et al.

PHYSICAL REVIEW LETTERS (2012)

Review Chemistry, Physical

Dynamics of Nanoconfined Supercooled Liquids

R. Richert

ANNUAL REVIEW OF PHYSICAL CHEMISTRY, VOL 62 (2011)

Article Chemistry, Multidisciplinary

Direct Measurement of Molecular Motion in Freestanding Polystyrene Thin Films

Keewook Paeng et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2011)

Article Multidisciplinary Sciences

Glass Transition Dynamics and Surface Layer Mobility in Unentangled Polystyrene Films

Zhaohui Yang et al.

SCIENCE (2010)

Article Chemistry, Physical

Size dependence of transition temperature in polymer nanowires

Sana Nakanishi et al.

JOURNAL OF PHYSICAL CHEMISTRY B (2008)

Article Multidisciplinary Sciences

Measuring the surface dynamics of glassy polymers

Z. Fakhraai et al.

SCIENCE (2008)

Article Physics, Multidisciplinary

Experimental evidence for a new parameter to control the glass transition of confined polymers

S. Srivastava et al.

PHYSICAL REVIEW LETTERS (2007)

Article Chemistry, Multidisciplinary

Effect of spatial confinement on the glass-transition temperature of patterned polymer nanostructures

Manish K. Mundra et al.

NANO LETTERS (2007)

Article Chemistry, Physical

Quantitative equivalence between polymer nanocomposites and thin polymer films

A Bansal et al.

NATURE MATERIALS (2005)

Article Multidisciplinary Sciences

Structural relaxation of polymer glasses at surfaces, interfaces and in between

RD Priestley et al.

SCIENCE (2005)

Article Physics, Multidisciplinary

Free surfaces cause reductions in the glass transition temperature of thin polystyrene films

JS Sharp et al.

PHYSICAL REVIEW LETTERS (2003)

Article Chemistry, Physical

Effect of physical ageing in thin glassy polymer films

S Kawana et al.

EUROPEAN PHYSICAL JOURNAL E (2003)

Article Physics, Fluids & Plasmas

Character of the glass transition in thin supported polymer films

S Kawana et al.

PHYSICAL REVIEW E (2001)

Article Physics, Multidisciplinary

Molecular structure of polystyrene at air/polymer and solid/polymer interfaces

KS Gautam et al.

PHYSICAL REVIEW LETTERS (2000)

Article Materials Science, Ceramics

Comparison of glass formation kinetics and segmental relaxation in polymers

CG Robertson et al.

JOURNAL OF NON-CRYSTALLINE SOLIDS (2000)