Zobrazeno 1 - 10
of 91
pro vyhledávání: '"JOHN D. HOFFMAN"'
Publikováno v:
J Res Natl Bur Stand (1977)
A model is proposed to estimate the surface free energy of a small polymer crystal with numerous emergent cilia. For such a model the partition function of a polymer constrained to remain in a cone is computed. The partition function of the polymer i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c2ed394809857ac5e46df4902b047da
https://pubmed.ncbi.nlm.nih.gov/34566024
https://pubmed.ncbi.nlm.nih.gov/34566024
Autor:
John I. Lauritzen, John D. Hoffman
Publikováno v:
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
A detailed interpretation of the kinetics of homogeneous nucleation and growth of crystals of a linear homopolymer from dilute solution is given. The probability of forming both nuclei with folded chains, and conventional bundlelike nuclei, from dilu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bce9c31d5c677684f04db46eb7fd9a3
https://pubmed.ncbi.nlm.nih.gov/32196159
https://pubmed.ncbi.nlm.nih.gov/32196159
Publikováno v:
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
The rate of isothermal bulk crystallization of poly(chlorotrifluoroethylene), Tm =221° C, was measured from 170° to 200° C. The intrinsic bulk crystallization, which accurately followed an n = 2 law, was shown to be a result of the injection of pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a2bd2e91a86354e171db0fc27ef27ba
https://pubmed.ncbi.nlm.nih.gov/31216143
https://pubmed.ncbi.nlm.nih.gov/31216143
Publikováno v:
Journal of Polymer Science Part C: Polymer Symposia. 14:173-235
Theoretical models for the ac and γe relaxation effects found in chain-folded polymer crystals (single crystal mats and bulk) are presented and compared with the available dielectric and mechanical loss data for polyethylene and polychlorotrifluoroe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a0ad53714bc10561e7d094926bc60bf
https://doi.org/10.1002/polc.5070140116
https://doi.org/10.1002/polc.5070140116
Autor:
John D. Hoffman, Robert L. Miller
Publikováno v:
Polymer. 38:3151-3212
The rate of growth of chain-folded lamellar crystals from the subcooled melt of polyethylene fractions is treated in terms of surface nucleation theory with the objective of illuminating the origin of the chain folding phenomenon and associated kinet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7e369d6b9a1982f90c2330735a6d845
https://doi.org/10.1016/s0032-3861(97)00071-2
https://doi.org/10.1016/s0032-3861(97)00071-2
Publikováno v:
Macromolecules. 25:2221-2229
A theory is presented for the lateral surface free energy parameter σ in the nucleation constant K g in the relation G exp[-K g /T(ΔT)f] that describes the growth rate of polymer crystals from the melt at low-to-moderate undercoolings ΔT. The theo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5befe9820dbdef0194af2581f1da9836
https://doi.org/10.1021/ma00034a025
https://doi.org/10.1021/ma00034a025
Autor:
John D. Hoffman, Robert L. Miller
Publikováno v:
Polymer. 32:963-978
The nucleation-based theory of polymer crystal growth has been extended to apply to the growth rate and morphology of polyethylene (PE) single crystals with curved edges. The treatment is employed to analyse in detail the data of Organ and Keller on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54f61d4c308922da01828cc8d9aa8793
https://doi.org/10.1016/0032-3861(91)90581-3
https://doi.org/10.1016/0032-3861(91)90581-3
Autor:
John D. Hoffman
Publikováno v:
Polymer. 32:2828-2841
Nucleation theory is applied to extended-chain crystallization as background to the extended-chain to once-folded transition problem and certain unusual effects found in recent experiments. In the ‘partial stem attachment’ model employed, the act
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e2046b6d633e39b5fea524c879f0aad
https://doi.org/10.1016/0032-3861(91)90116-z
https://doi.org/10.1016/0032-3861(91)90116-z
Autor:
John D. Hoffman, Herve Marand
Publikováno v:
Macromolecules. 23:3682-3687
Determination par SAXS et DSC des espacements longs et du point de vue fusion de polypivalolactone cristallisee isothermiquement entre 190 et 200°C. Les donnees de point de fusion et l'epaisseur lamellaire sont analysees par l'equation de Gibbs-Thom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b8eb9a83440f8f051d680c9dd6ec32d
https://doi.org/10.1021/ma00217a023
https://doi.org/10.1021/ma00217a023
Voice recognition (VR) and picture archiving and communication system (PACS) both have advantages and disadvantages in radiologic practice. We describe a fully integrated VR/PACS system running on a single platform. Integration optimizes the positive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::802ce613d8c504525b3fd6d58f8c503f
https://europepmc.org/articles/PMC3452693/
https://europepmc.org/articles/PMC3452693/
