2024

A Bayesian Inference Approach to Accurately Fitting the Glass Transition Temperature in Thin Polymer Films
James H. Merrill, Yixuan Han, and Connie B. Roth,
Macromolecules   2024, 57, 11055–11074.   DOI: 10.1021/acs.macromol.4c01867
Link to GitHub repository for PyTg code

Forming denser glasses on soft substrates
Connie B. Roth,
Nature Materials   2024, 23, 587–588.   DOI: 10.1038/s41563-024-01881-5

Comparing the Impact of Different Adsorbed Layers on the Local Glass Transition of Polymer Matrices Michael F. Thees, James. H. Merrill, Xinru Huang, and Connie B. Roth,
Journal of Chemical Physics   2024, 160, 044908.   DOI: 10.1063/5.0182541

Development of broad modulus profile upon polymer–polymer interface formation between immiscible glassy–rubbery domains
Yannic J. Gagnon, Justin C. Burton, and Connie B. Roth,
Proceedings of the National Academy of Sciences   2024, 121, e2312533120.   DOI: 10.1073/pnas.2312533120
Link to short Kudos description of this paper.

2023

End-Tethered Chains Increase the Local Glass Transition Temperature of Matrix Chains by 45 K Next to Solid Substrates Independent of Chain Length
James H. Merrill, Ruoyu Li, and Connie B. Roth, ACS Macro Letters   2023, 12, 1-7

2022

Temperature Dependent Perylene Fluorescence as a Probe of Local Polymer Glass Transition Dynamics
Yixuan Han and Connie B. Roth,
Soft Matter   2022, 18, 6094-6104.

Physically Intuitive Continuum Mechanics Model for QCM:   Viscoelasticity of Rubbery Polymers at MHz Frequencies
Yannic J. Gagnon, Justin C. Burton, and Connie B. Roth,
Journal of Polymer Science   2022, 60, 244-257.

Book chapter:   Polymer Glasses
Connie B. Roth,
Chapter in Macromolecular Engineering: From Precise Synthesis to Macroscopic Materials and Applications, 2nd edition, edited by Krzysztof Matyjaszewski, Yves Gnanou, Nikos Hadjichristidis, Murugappan Muthukumar (Wiley-VCH GmbH, 2022).

2021

Gradient in Refractive Index Reveals Denser Near Free Surface Region in Thin Polymer Films
Yixuan Han and Connie B. Roth,
Journal of Chemical Physics   2021, 155, 144901.

Polymers Under Nanoconfinement:   Where Are We Now in Understanding Local Property Changes?
Connie B. Roth,
Chemical Society Reviews   2021, 50, 8050-8066.

2020

Local Glass Transition Temperature Tg(z) Within Polystyrene Is Strongly Impacted by the Modulus of the Neighboring PDMS Domain
Yannic J. Gagnon and Connie B. Roth,
ACS Macro Letters   2020, 9, 1625-1631.

Comparing Refractive Index and Density Changes with Decreasing Film Thickness in Thin Supported Films Across Different Polymers
Yixuan Han, Xinru Huang, Alan C. W. Rohrbach, and Connie B. Roth,
Journal of Chemical Physics   2020, 153, 044902.

Experimental Study of Substrate Roughness on the Local Glass Transition of Polystyrene
Xinru Huang, Michael F. Thees, William B. Size, and Connie B. Roth,
Journal of Chemical Physics   2020, 152, 244901.

Review and Reproducibility of Forming Adsorbed Layers From Solvent Washing of Melt Annealed Films
Michael F. Thees, Jennifer A. McGuire, and Connie B. Roth,
Soft Matter   2020, 16, 5366-5387.

2019

Unexpected Molecular Weight Dependence to the Physical Aging of Thin Polystyrene Films Present at Ultra-High Molecular Weights
Michael F. Thees and Connie B. Roth,
Journal of Polymer Science, Part B: Polymer Physics   2019, 57, 1224-1238.

Jumping In and Out of the Phase Diagram Using Electric Fields: Time Scale for Remixing of Polystyrene/Poly(vinyl methyl ether) Blends
Annika Kriisa and Connie B. Roth,
ACS Macro Letters   2019, 8, 188-192.

2018

Optimizing the Grafting Density of Tethered Chains to Alter the Local Glass Transition Temperature of Polystyrene near Silica Substrates:   The Advantage of Mushrooms over Brushes
Xinru Huang and Connie B. Roth,
ACS Macro Letters   2018, 7, 269-274.

Local Glass Transition Temperature Tg(z) Profile in Polystyrene next to Polybutadiene With and Without Plasticization Effects
Benjamin L. Kasavan, Roman R. Baglay, and Connie B. Roth,
Macromolecular Chemistry and Physics   2018, 219, 1700328.

2017

Aging Near Rough and Smooth Boundaries in Colloidal Glasses
Cong Cao, Xinru Huang, Connie B. Roth, and Eric R. Weeks,
Journal of Chemical Physics   2017, 147, 224505. ( Highlighted as AIP Scilight )

Experimental Study of the Influence of Periodic Boundary Conditions:   Effects of Finite Size and Faster Cooling Rates on Dissimilar Polymer-Polymer Interfaces
Roman R. Baglay and Connie B. Roth,
ACS Macro Letters   2017, 6, 887-891.

Local Glass Transition Temperature Tg(z) of Polystyrene Next to Different Polymers:   Hard vs. Soft Confinement
Roman R. Baglay and Connie B. Roth,
Journal of Chemical Physics   2017, 146, 203307. ( Highlighted as AIP Scilight )

2016

Book chapter:   Correlating Glass Transition and Physical Aging in Thin Polymer Films
Connie B. Roth, Justin E. Pye, and Roman R. Baglay,
Chapter 5 in Polymer Glasses, edited by Connie B. Roth (CRC Press, Taylor & Francis Group, December 2016), p. 181-203.

Book chapter:   Fundamentals of Polymers and Glasses
C.B. Roth and R.R. Baglay,
Chapter 1 in Polymer Glasses, edited by Connie B. Roth (CRC Press, Taylor & Francis Group, December 2016), p. 3-22.

Changes in the Temperature-Dependent Specific Volume of Supported Polystyrene Films with Film Thickness
Xinru Huang and Connie B. Roth,
Journal of Chemical Physics   2016, 144, 234903. (Highlighted as an Editor’s Pick)

2015

Communication:   Experimentally Determined Profile of Local Glass Transition Temperature Across a Glassy-Rubbery Polymer Interface with a Tg Difference of 80 K
Roman R. Baglay and Connie B. Roth,
Journal of Chemical Physics   2015, 143, 111101.

Above, Below, and In-Between the Two Glass Transitions of Ultrathin Free-Standing Polystyrene Films:   Thermal Expansion Coefficient and Physical Aging
Justin E. Pye and Connie B. Roth,
Journal of Polymer Science, Part B: Polymer Physics   2015, 53, 64-75.

Role of neighboring domains in determining the magnitude and direction of Tg-confinement effects in binary, immiscible polymer systems
Christopher M. Evans, Soyoung Kim, Connie B. Roth, Rodney D. Priestley, Linda J. Broadbelt, John M. Torkelson,
Polymer   2015, 80, 180-187.

2014

Electric Fields Enhance Miscibility of Polystyrene / Poly(vinyl methyl ether) Blends
Annika Kriisa and Connie B. Roth,
Journal of Chemical Physics   2014, 141, 134908.

Stability of Polymer Glasses Vitrified Under Stress
Laura A. G. Gray and Connie B. Roth,
Soft Matter   2014, 10, 1572-1578.

2013

Effect of Adjacent Rubbery Layers on the Physical Aging of Glassy Polymers
Phillip M. Rauscher, Justin E. Pye, Roman R. Baglay, and Connie B. Roth,
Macromolecules   2013, 46, 9806-9817.

Physical Aging of Polymer Films Quenched and Measured Free-Standing via Ellipsometry:   Controlling Stress Imparted by Thermal Expansion Mismatch between Film and Support
Justin E. Pye and Connie B. Roth,
Macromolecules   2013, 46, 9455-9463.

2012

Importance of Quench Conditions on the Subsequent Physical Aging Rate of Glassy Polymer Films
Laura A. G. Gray, Suk W. Yoon, William A. Pahner, James E. Davidheiser, and Connie B. Roth, Macromolecules   2012, 45, 1701-1709.

Characterization of Phase Separation of Polystyrene / Poly(vinyl methyl ether) Blends Using Fluorescence
Annika Kriisa, Sung S. Park, and Connie B. Roth,
Journal of Polymer Science, Part B: Polymer Physics   2012, 50, 250-256.

2011

Two Simultaneous Mechanisms Causing Glass Transition Temperature Reductions in High Molecular Weight Free-Standing Polymer Films as Measured by Transmission Ellipsometry
Justin E. Pye and Connie B. Roth,
Physical Review Letters   2011, 107, 235701.

2010

Mobility and Stability of Glasses
Connie B. Roth,
Journal of Polymer Science, Part B: Polymer Physics   2010, 48, 2558-2560.

Physical Aging in Ultrathin Polystyrene Films:   Evidence of a Gradient in Dynamics at the Free Surface and Its Connection to the Glass Transition Temperature Reductions
Justin E. Pye, Kate A. Rohald, Elizabeth A. Baker, and Connie B. Roth,
Macromolecules   2010, 43, 8296-8303.

Suppression of the Tg-Nanoconfinement Effect in Thin Poly(vinyl acetate) Films by Sorbed Water
Soyoung Kim, Manish K. Mundra, Connie B. Roth, and John M. Torkelson,
Macromolecules   2010, 43, 5158-5161.

2009

Streamlined Ellipsometry Procedure for Characterizing Physical Aging Rates of Thin Polymer Films
Elizabeth A. Baker, Perla Rittigstein, John M. Torkelson, and Connie B. Roth,
Journal of Polymer Science, Part B: Polymer Physics   2009, 47, 2509-2519.

Confinement Effects on Glass Transition Temperature, Transition Breadth, and Expansivity:   Comparison of Ellipsometry and Fluorescence Measurements on Polystyrene Films
Soyoung Kim, Sheldon A. Hewlett, Connie B. Roth, and John M. Torkelson,
European Physical Journal E   2009, 30, 83-92.

2008

Critical Micelle Concentrations of Block and Gradient Copolymers in Homopolymer:   Effects of Sequence Distribution, Composition and Molecular Weight
Robert W. Sandoval, Daniel E. Williams, Jungki Kim, Connie B. Roth, and John M. Torkelson,
Journal of Polymer Science, Part B: Polymer Physics   2008, 46, 2672-2682.

Effect of Nanoscale Confinement on the Glass Transition Temperature of Free-Standing Polymer Films:   Novel, Self-Referencing Fluorescence Method
Soyoung Kim, Connie B. Roth, and John M. Torkelson,
Journal of Polymer Science, Part B: Polymer Physics   2008, 46, 2754-2764.

2007

Comparison of Critical Micelle Concentrations of Gradient Copolymer and Block Copolymer in Homopolymer:   Novel Characterization by Intrinsic Fluorescence
Christopher L. H. Wong, Jungki Kim, Connie B. Roth, and John M. Torkelson,
Macromolecules   2007, 40, 5631-5633.

Selectively Probing the Glass Transition Temperature in Multilayer Polymer Films:   Equivalence of Block Copolymers and Multilayer Films of Different Homopolymers
Connie B. Roth and John M. Torkelson,
Macromolecules   2007, 40, 3328-3336.

Eliminating the Enhanced Mobility at the Free Surface of Polystyrene:   Fluorescence Studies of the Glass Transition Temperature in Thin Bilayer Films of Immiscible Polymers
Connie B. Roth, Katie L. McNerny, Wolter F. Jager, and John M. Torkelson,
Macromolecules   2007, 40, 2568-2574.

2006

Hole growth as a micro-rheological probe to measure the viscosity of polymers confined to thin films
Connie B. Roth and John R. Dutcher,
Journal of Polymer Science, Part B: Polymer Physics   2006, 44, 3011-3021.

Molecular weight dependence of the glass transition temperature of freely-standing poly(methyl methacrylate) films
Connie B. Roth, Adam Pound, Stephen W. Kamp, Christopher A. Murray, and John R. Dutcher,
European Physical Journal E   2006, 20, 441-448.

2005

Evidence of convective constraint release during hole growth in freely standing polystyrene films at low temperatures
Connie B. Roth, B. Deh, Bernie G. Nickel, and John R. Dutcher, Physical Review E   2005, 72, 021802.

Hole growth in freely-standing polystyrene films probed using a differential pressure experiment
Connie B. Roth and John R. Dutcher,
Physical Review E   2005, 72, 021803.

Glass transition and chain mobility in thin polymer films
Connie B. Roth and John R. Dutcher,
Journal of Electroanalytical Chemistry   2005, 584, 13-22.

Mobility on Different Length Scales in Thin Polymer Films
Connie B. Roth and John R. Dutcher,
Chapter in Soft Materials: Structure and Dynamics, edited by John R. Dutcher and Alejandro G. Marangoni (Marcel Dekker, N.Y., Chap. 1, pp. 1-38, 2005).

2003

Glass Transition Temperature of Freely-Standing Films of Atactic Poly(methyl methacrylate)
Connie B. Roth and John R. Dutcher,
European Physical Journal E)   2003, 12, S103-S107.

Differential Pressure Experiment to Probe Hole Growth in Freely-Standing Polymer Films
Connie B. Roth, Bernie G. Nickel, John R. Dutcher, and Kari Dalnoki-Veress,
Review of Scientific Instruments   2003, 74, 2796-2804.

2000

Instabilities in Thin Polymer Films:   From Pattern Formation to Rupture
John R. Dutcher, Kari Dalnoki-Veress, Bernie G. Nickel, and Connie B. Roth,
Macromolecular Symposia   2000, 159, 143-150.

1999

Hole Formation and Growth in Freely-Standing Polystyrene Films
Kari Dalnoki-Veress, Bernie G. Nickel, Connie Roth, and John R. Dutcher,
Physical Review E   1999, 59, 2153-2156.