Výsledky vyhledávání - "Howard, H. D."

The origin of the β transition and its influence on physical ageing

Autor: Frederick J. McGarry, Howard H.-D Lee

Publikováno v: Polymer. 34:4267-4272

Volume dilatometry was used to explore the origin of the β transition ( T β ) and its influence on physical ageing. The results show that volume recovery does occur even at temperatures below T β , a phenomenon indicating the existence of molecula

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::147c29ad6ebc59aa33979600d9711210
https://doi.org/10.1016/0032-3861(93)90187-f

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Dispersibility of a Multipowder Mixture in Aqueous Systems

Autor: Howard H. D. Lee

Publikováno v: Journal of Colloid and Interface Science. 159:210-213

Dispersibility of a multipowder mixture in aqueous solutions of an electrosteric dispersant was studied. The results show that stable dispersion of this powder mixture can be achieved if a minimum concentration of the dispersant is provided. The disp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a454ffa6c1e52dd2fb8e7fd7916b4176
https://doi.org/10.1006/jcis.1993.1314

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The possibly trapped excess free volume

Autor: Howard H. D. Lee, Frederick J. Mc Garry

Publikováno v: Journal of Macromolecular Science, Part B. 29:237-248

Excess free-volume trapping incurred by quenching has been quantified for atactic polystyrenes with different molecular weights. As the initial temperature (T0) is elevated from the glass transition (Tg), the increment in excess free-volume trapping

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db4f1e604dee5eb86721264b1a2ee273
https://doi.org/10.1080/00222349008245776

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Glass and β transitions of atactic polystyrenes monitored by volume dilatometry

Autor: Fredrick J. Mc Garry, Howard H. D. Lee

Publikováno v: Journal of Macromolecular Science, Part B. 29:185-202

Volume recovery in the temperature range of above Tg to below T β has been studied for two atactic polystyrene specimens (M w = 210,000 and 300,000 g/mol). Observations clearly disclose the collapse of free volume even at temperatures well below Tβ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::52744f5d9f69ce5dc3c0a27c8d0e36fe
https://doi.org/10.1080/00222349008245773

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Changes in free volume and mechanical properties of PVC films incurred by quenching and aging

Autor: Howard H. D. Lee, Frederick J. Mc Garry

Publikováno v: Journal of Macromolecular Science, Part B. 29:11-29

Using a specially constructed microbalance for hydrostatic weighing, the specific volume increase due to rapid quenching (∼500°C/sec) and the subsequent densification from physical aging have been observed for PVC thin films. The more severe the q

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db22d8587110ece88240bfde289b1313
https://doi.org/10.1080/00222349008212333

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