Search Results - "McKenna, Gregory B."

50th Anniversary Perspective: Challenges in the Dynamics and Kinetics of Glass-Forming Polymers by McKenna, Gregory B, Simon, Sindee L

“…The phenomenology of the glass transition and the associated behavior in the near liquid and glassy states are detailed, including the cooling rate dependence…”
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Nanoconfinement Effects on the Glass Transition and Crystallization Behaviors of Nifedipine by Cheng, Sixue, McKenna, Gregory B

“…The impact of nanoconfinement on the crystallization and glass transition behaviors of nifedipine (NIF) has been investigated using differential scanning…”
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Isothermal Crystallization and Time–Temperature Transformation of Amorphous Nifedipine: A Case of Polymorphism Formation and Conversion by Cheng, Sixue, McKenna, Gregory B

“…Crystallization of active pharmaceutical ingredients (APIs) from the supercooled liquid state is an important issue in determining the stability of amorphous…”
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Correlation between dynamic fragility and glass transition temperature for different classes of glass forming liquids by Qin, Qian, McKenna, Gregory B.

“…Here we compile literature data for dynamic fragility m for six types of glass forming liquids: polymers, small molecule organics, hydrogen bonding organics,…”
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Viscoelastic and Glass Transition Properties of Ultrathin Polystyrene Films by Dewetting from Liquid Glycerol by Wang, Jinhua, McKenna, Gregory B

“…We have used the liquid dewetting method originally proposed by Bodiguel and Fretigny (Eur. Phys. J. E: Soft Matter Biol. Phys. 2006, 19(2), 185–193) to study…”
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Linear Rheological Response of a Series of Densely Branched Brush Polymers by Hu, Miao, Xia, Yan, McKenna, Gregory B, Kornfield, Julia A, Grubbs, Robert H

“…We have examined the linear rheological responses of a series of well-defined, dense, regularly branched brush polymers. These narrow molecular weight…”
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Substrate Effects on Glass Transition and Free Surface Viscoelasticity of Ultrathin Polystyrene Films by Yoon, Heedong, McKenna, Gregory B

“…We describe results from experiments in which spontaneous embedment of 20 nm silica particles was used to probe under-layer effects on the free surface…”
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Challenging the Kauzmann paradox using an ultra-stable perfluoropolymer glass with a fictive temperature below the dynamic VFT temperature by El Banna, Amer A., McKenna, Gregory B.

“…Ultra-stable fluoropolymer glasses were created using vacuum pyrolysis deposition that show large fictive temperature T f reductions relative to the glass…”
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Effect of molecular architecture on ring polymer dynamics in semidilute linear polymer solutions by Zhou, Yuecheng, Hsiao, Kai-Wen, Regan, Kathryn E., Kong, Dejie, McKenna, Gregory B., Robertson-Anderson, Rae M., Schroeder, Charles M.

“…Understanding the dynamics of ring polymers is a particularly challenging yet interesting problem in soft materials. Despite recent progress, a complete…”
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Correlation between Molecular Mobility and Physical Stability in Pharmaceutical Glasses by Mehta, Mehak, Ragoonanan, Vishard, McKenna, Gregory B, Suryanarayanan, Raj

“…We investigated a possible correlation between molecular mobility and physical stability in glassy celecoxib and indomethacin and identified the specific…”
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Re-visiting the “consequences of grafting density on the linear viscoelastic behavior of graft polymers” by Qian, Zhiyuan, Chen, Dongjie, McKenna, Gregory B.

“…In a recent work published by Haugan et al. (ACS Macro Lett., 2018, 7, 525–530.), the linear viscoelastic behaviors of a series of random graft polymers as a…”
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Rheology of Entangled Solutions of Ring–Linear DNA Blends by Kong, Dejie, Banik, Sourya, San Francisco, Michael J, Lee, Megan, Robertson Anderson, Rae M, Schroeder, Charles M, McKenna, Gregory B

“…Bulk rheology measurements on concentrated monodisperse ring–linear DNA mixtures are reported for the first time. The entanglement behavior of the ring–linear…”
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High strain rate mechanical properties of a cross-linked epoxy across the glass transition by Sirk, Timothy W., Khare, Ketan S., Karim, Mir, Lenhart, Joseph L., Andzelm, Jan W., McKenna, Gregory B., Khare, Rajesh

“…Molecular dynamics simulations were used to study the high strain rate mechanical properties of a cross-linked epoxy system comprised of diglycidyl ether of…”
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Forced assembly by multilayer coextrusion to create oriented graphene reinforced polymer nanocomposites by XIGUANG LI, McKENNA, Gregory B, MIQUELARD-GARNIER, Guillaume, GUINAULT, Alain, SOLLOGOUB, Cyrille, REGNIER, Gilles, ROZANSKI, Artur

“…A potential advantage of platelet-like nanofillers as nanocomposite reinforcements is the possibility of achieving two-dimensional stiffening through planar…”
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Glass transition temperature of thin polycarbonate films measured by flash differential scanning calorimetry by Shamim, Nabila, Koh, Yung P., Simon, Sindee L., McKenna, Gregory B.

“…ABSTRACT Flash differential scanning calorimetry was used to study the glass transition temperature Tg of polycarbonate ultrathin films. The investigation was…”
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When Ends Meet: Circular DNA Stretches Differently in Elongational Flows by Li, Yanfei, Hsiao, Kai-Wen, Brockman, Christopher A, Yates, Daniel Y, Robertson-Anderson, Rae M, Kornfield, Julia A, San Francisco, Michael J, Schroeder, Charles M, McKenna, Gregory B

“…Chain topology has a profound impact on the flow behavior of single macromolecules. For circular polymers, the absence of free ends results in a unique chain…”
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Linear Rheology of a Series of Second-Generation Dendronized Wedge Polymers by Qian, Zhiyuan, Koh, Yung P, Pallaka, Madhusudhan R, Chang, Alice B, Lin, Tzu-Pin, Guzmán, Pablo E, Grubbs, Robert H, Simon, Sindee L, McKenna, Gregory B

“…A series of second-generation dendronized wedge polymers were synthesized by ring-opening metathesis polymerization, and the linear viscoelastic response over…”
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Viscoelastic modeling of nanoindentation experiments: A multicurve method by Zhai, Meiyu, McKenna, Gregory B.

“…ABSTRACT Nanoindentation is an increasingly used method of extracting surface mechanical properties of viscoelastic materials, especially polymers. Recently,…”
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Exceptional Property Changes in Ultrathin Films of Polycarbonate: Glass Temperature, Rubbery Stiffening, and Flow by O’Connell, Paul A, Wang, Jian, Ishola, T. Adeniyi, McKenna, Gregory B

“…The TTU nanobubble inflation method has been used to determine the creep compliance of ultrathin films of polycarbonate over a thickness range of 3–22 nm and a…”
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Comparison of surface mechanical properties among linear and star polystyrenes: Surface softening and stiffening at different temperatures by Karim, Taskin B., McKenna, Gregory B.

“…In a previous study, we reported both surface softening and stiffening for poly(α-methylstyrene) (PαMS) over a temperature range from room temperature to 21 °C…”
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