Influence of temperature and pressure on the dynamics of glass formers explored by dielectric spectroscopy

被引：6

作者：

Casalini, R ^{[1
]}

Capaccioli, S

Presto, S

Lucchesi, M

Rolla, PA

Corezzi, S

Paluch, M

机构：

[1] Univ Pisa, INFM, Pisa, Italy

[2] Univ Pisa, Dipartimento Fis, Pisa, Italy

[3] Univ Perugia, INFM, I-06100 Perugia, Italy

[4] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy

[5] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2001年 / 8卷 / 03期

关键词：

D O I：

10.1109/94.933352

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The dynamics of the epoxy compound polyphenyl-glycidyl-ether-coformaldehyde was investigated by wideband dielectric spectroscopy (10(-2) to 10(10) Hz) by varying either pressure or temperature. The measurements were undertaken in two different conditions: under isobaric condition (atmospheric pressure) varying temperature down to the supercooled and glassy phases and under isothermal conditions by changing the pressure from 0.1 to 270 MPa. The analysis of the structural relaxation time behavior either varying the temperature or the pressure was found to agree well with a previously derived expression for tau (T, P) based on a cooperative model. In particular it was found that with a unique set of parameters it is possible to describe the 2-dimensional surface tau-(T, P) over a wide range of temperature and pressure. This result agrees well with the observed independence of the fragility in both isothermal and isobaric conditions.

引用

页码：395 / 400

页数：6

共 34 条

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