Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Massimo Faetti"'
Autor:
Massimo Faetti, Laura Andreozzi, Fabio Zulli, Istvan Szanka, Marco Giordano, Ciro Autiero, Giancarlo Galli
Publikováno v:
Macromolecular Symposia. :463-469
ESR studies of the rotational dynamics of the cholestane spin probe dissolved in nematic azobenzene polymethacrylates from above TNI to below Tg are presented. Different dynamic regimes were recognized, in which the molecular sites or distributions o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d71906ef736fe18be9acf667edd2ae3
https://doi.org/10.1002/masy.200651366
https://doi.org/10.1002/masy.200651366
Publikováno v:
Journal of Non-Crystalline Solids. 352:4785-4789
In this work we carried out positron annihilation lifetime spectroscopy (PALS) on pure poly(propylene glycol) (PPG 4000) and an electron spin resonance (ESR) study on PPG 4000 doped with the spin probe TEMPO. The spectral and dynamic features of both
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec74ac03b8c0c0108056cbeac4bdcd27
https://doi.org/10.1016/j.jnoncrysol.2006.02.165
https://doi.org/10.1016/j.jnoncrysol.2006.02.165
Publikováno v:
Molecular Crystals and Liquid Crystals. 441:13-26
We investigated the rheological behavior of two nematic polymethacrylate homopolymer samples, S1 and S5, containing azobenzene side groups. They possessed different molar mass and molar mass distribution, which was fitted by a two-component molar mas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f359aa94f950f32311b12604df9739a9
https://doi.org/10.1080/154214091009518
https://doi.org/10.1080/154214091009518
Publikováno v:
Macromolecules. 38:6056-6067
The effects of the molecular weight on the physical aging of polymers were investigated by means of differential scanning calorimetry (DSC) experiments in five PMMA samples with mass values across ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75482e3c589bc683ad0454df699fe751
https://doi.org/10.1021/ma0507037
https://doi.org/10.1021/ma0507037
Publikováno v:
Molecular Crystals and Liquid Crystals. 429:21-29
The rotational dynamics of the cholestane spin probe dissolved in nematic azobenzene polymethacrylates (homopolymer and copolymer) was studied by electron spin resonance spectroscopy. Upon isothermal annealing in the isotropic phase, dynamic nanoscal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::81663dc900957dca22ac78dd77f57b8c
https://doi.org/10.1080/15421400590930629
https://doi.org/10.1080/15421400590930629
Publikováno v:
Molecular Crystals and Liquid Crystals. 429:301-312
A rheological study of a methacrylate homopolymer containing azobenzene side groups and its 70/30 copolymer with methyl methacrylate was performed in the linear viscoelastic regime. The creep and oscillatory measurements enabled us to obtain the temp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aac1f8afb371eede9b20dcd0e62dc34d
https://doi.org/10.1080/15421400590931033
https://doi.org/10.1080/15421400590931033
Publikováno v:
The European Physical Journal B. 41:383-393
The Tool-Narayanaswamy-Moynihan (TNM) phenomenological model is widely accepted in order to describe the structural relaxation of glasses. However several quantitative discrepancies can be found in the literature that cannot be entirely ascribed to t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95ff127ddc501abf1d326d36b8ce9b42
https://doi.org/10.1140/epjb/e2004-00331-6
https://doi.org/10.1140/epjb/e2004-00331-6
Connecting Shear Stress Relaxation and Enthalpy Recovery in Polymers through a Modified TNM Approach
Publikováno v:
Macromolecules. 37:8010-8016
The Tool−Narayanaswamy−Moynihan model (TNM) is widely accepted in order to describe the enthalpy recovery mechanism of polymers. However, some problems have been found in quantitative analysis as far as the parameters of the model are concerned.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c41264e7b92e90ea1a3d874cc6016545
https://doi.org/10.1021/ma049334p
https://doi.org/10.1021/ma049334p
Publikováno v:
Philosophical Magazine. 84:1555-1565
The topic of dynamic changes undergone by glass-forming materials in the supercooled region is addressed in this study. Crossover regions and temperatures are generally considered as key features in order for the glass transition phenomenon to be und
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46b2a3311dd3ef24bb92ac9664132c18
https://doi.org/10.1080/14786430310001644332
https://doi.org/10.1080/14786430310001644332
Autor:
D. Palazzuoli, Laura Andreozzi, Giancarlo Galli, Massimo Faetti, Michele Laus, Marco Giordano
Publikováno v:
Molecular Crystals and Liquid Crystals. 398:97-106
The mass contents in five samples of a nematic azobenzene polymethacrylate having different molar masses and molar mass distributions were evaluated starting from either Logarithmic Normal (LN) or ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::938d4e3fbf8111041d30f936729c3b33
https://doi.org/10.1080/15421400390221457
https://doi.org/10.1080/15421400390221457