Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Heedong Yoon"'
Publikováno v:
Polymers, Vol 15, Iss 17, p 3501 (2023)
Thermosetting polymers tend to have a stiffness–toughness trade-off due to the opposing relationship of stiffness and toughness on crosslink density. We hypothesize that engineering the polymer network, e.g., by incorporating urethane oligomers, we
Externí odkaz:
https://doaj.org/article/33521b07ced3445392ccf7823b5a438f
Autor:
Daniel J. Ryan, Kazem V. Edmond, Nicolas J. Alvarez, Manesh Gopinadhan, Zachary R. Hinton, Stuart Smith, Heedong Yoon, James Heinzman, Clarence Chase
Publikováno v:
Soft Matter. 17:8925-8936
Pitch-based carbon fibers are of considerable interest as high-performance materials. There are reports over the last several decades detailing (i) methods of improving pitch-based carbon fiber performance, and (ii) reducing the cost of production vi
Autor:
Jason Kilpatrick, John B. Pethica, Johann P. de Silva, Heedong Yoon, Mithun Chowdhury, Warren C. Oliver, Gregory B. McKenna, Graham L. W. Cross, Owen Brazil
Publikováno v:
Journal of Materials Research. 35:644-653
The measurement of thin film mechanical properties free from substrate influence remains one of the outstanding challenges in nanomechanics. Here, a technique based on indentation of a supported film with a flat punch whose diameter is many times the
Autor:
Gregory B. McKenna, Heedong Yoon
Publikováno v:
Macromolecules. 50:9821-9830
Prior bubble inflation studies have shown strong evidence of rubbery-like stiffening behaviors for several organic and inorganic thin films. The possible origin is still unclear, but recently Ngai et al. [J. Polym. Sci., Part B: Polym. Phys. 2013, 51
Publikováno v:
Macromolecules. 50:4562-4574
Vacuum pyrolysis deposition (VPD) has been used to create an ultrastable polymer glass having a fictive temperature Tf of as much as 57 K below the nominal glass transition temperature of the thermally rejuvenated polymer. Amorphous fluoropolymer fil
Autor:
Heedong Yoon, McKenna, Gregory B.
Publikováno v:
Journal of Chemical Physics; 2016, Vol. 144 Issue 18, p1-11, 11p, 6 Charts, 9 Graphs
Autor:
Mithun Chowdhury, Heedong Yoon, Owen Brazil, Johann P. de Silva, Graham L. W. Cross, John B. Pethica, Jason I. Kilpatrick, Gregory B. McKenna, Warren C. Oliver
Publikováno v:
Journal of Materials Research. 35:654-654
In the original publication of this article [1], an erroneous repetitive sentence appeared in the abstract; it has since been removed.
Autor:
Gregory B. McKenna, Heedong Yoon
Publikováno v:
Science Advances
Measurements on nanogram samples of ultrastable polymer Teflon films challenge paradigms of the glass transition event.
A major challenge to understanding glass-forming materials is obtaining equilibrium data far below the laboratory glass trans
A major challenge to understanding glass-forming materials is obtaining equilibrium data far below the laboratory glass trans
Autor:
Heedong Yoon, Gregory B. McKenna
Publikováno v:
Macromolecules. 47:8808-8818
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 dynamics and the glass transition temperature (Tg) of polystyrene. Both 13 and 20 nm thick polysty
Autor:
Heedong Yoon, McKenna, Gregory B.
Publikováno v:
Macromolecules; 12/26/2017, Vol. 50 Issue 24, p9821-9830, 10p