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[ subject:"Physics, Condensed Matter." ]
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Fluctuation dissipation relation and...
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Northeastern University., Physics.
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Fluctuation dissipation relation and scaling behavior during aging in polymer glasses.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Fluctuation dissipation relation and scaling behavior during aging in polymer glasses./
作者:
Oukris, Hassan.
面頁冊數:
274 p.
附註:
Adviser: Nathan Israeloff.
Contained By:
Dissertation Abstracts International69-07B.
標題:
Physics, Condensed Matter. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3315564
ISBN:
9780549665410
Fluctuation dissipation relation and scaling behavior during aging in polymer glasses.
Oukris, Hassan.
Fluctuation dissipation relation and scaling behavior during aging in polymer glasses.
- 274 p.
Adviser: Nathan Israeloff.
Thesis (Ph.D.)--Northeastern University, 2008.
The goal of this work is to study the validity of the fluctuation dissipation relation (FDR) during aging in a glassy polymer and in general glassy dynamics, through probing aging dynamics, in thin films of polyvinyl acetate (PVAc). We use a rapid quench process by applying local radiation heating to a thin layer capacitor. The time evolution of polarization noise and dielectric susceptibility are analyzed in the frequency range 0.0259 Hz--13.307 Hz following quenches from above to below the glass transition temperature (T g). It is found that understanding and eliminating various artifacts such as signal drift, non-stationary responses, extraneous noise spikes due to differential thermal contractions, also reducing the effect of spectral leakage due to the finite Fourier transform artifacts and a carful background signal subtraction are very important for accurately determining effective temperature. We find moderate FDR violations, which remain clearly above the bath temperature for more than 100s after quench for frequencies < 0.4159 Hz. This corresponds to f tw>10, much larger than for spin glasses. However, we also detect a very strong violations which rapidly decay, with Teff >103, for the lowest frequencies and shortest aging times, tw. Our measurements of the dielectric response in glassy polymers at the equilibrium and aging regime in frequency range of 10-3 to 105 Hz provide a direct analogy with the magnetic-susceptibility aging studies in spin glasses. We can then examine if the theories proposed for spin glasses have relevance for glassy polymers. The results of these experimental studies are important in understanding the relaxation dynamics of glassy systems and in testing the validity and the relevance of the effective temperature concepts and also distinguishing between different theoretical models.
ISBN: 9780549665410Subjects--Topical Terms:
1018743
Physics, Condensed Matter.
Fluctuation dissipation relation and scaling behavior during aging in polymer glasses.
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The goal of this work is to study the validity of the fluctuation dissipation relation (FDR) during aging in a glassy polymer and in general glassy dynamics, through probing aging dynamics, in thin films of polyvinyl acetate (PVAc). We use a rapid quench process by applying local radiation heating to a thin layer capacitor. The time evolution of polarization noise and dielectric susceptibility are analyzed in the frequency range 0.0259 Hz--13.307 Hz following quenches from above to below the glass transition temperature (T g). It is found that understanding and eliminating various artifacts such as signal drift, non-stationary responses, extraneous noise spikes due to differential thermal contractions, also reducing the effect of spectral leakage due to the finite Fourier transform artifacts and a carful background signal subtraction are very important for accurately determining effective temperature. We find moderate FDR violations, which remain clearly above the bath temperature for more than 100s after quench for frequencies < 0.4159 Hz. This corresponds to f tw>10, much larger than for spin glasses. However, we also detect a very strong violations which rapidly decay, with Teff >103, for the lowest frequencies and shortest aging times, tw. Our measurements of the dielectric response in glassy polymers at the equilibrium and aging regime in frequency range of 10-3 to 105 Hz provide a direct analogy with the magnetic-susceptibility aging studies in spin glasses. We can then examine if the theories proposed for spin glasses have relevance for glassy polymers. The results of these experimental studies are important in understanding the relaxation dynamics of glassy systems and in testing the validity and the relevance of the effective temperature concepts and also distinguishing between different theoretical models.
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