Relationship between dynamics and thermodynamics in glass-forming polymers

被引：56

作者：

Cangialosi, D

Alegría, A

Colmenero, J

机构：

[1] Fdn Donostia, Int Phys Ctr, San Sebastian 20018, Spain

[2] Univ Basque Country, Dept Fis Mat, EHU, E-20080 San Sebastian, Spain

[3] Univ Basque Country, CSIC, EHU, Fac Quim,Unidad Fis Mat Ctr Mixto, E-20080 San Sebastian, Spain

来源：

EUROPHYSICS LETTERS | 2005年 / 70卷 / 05期

关键词：

D O I：

10.1209/epl/i2005-10029-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have tested the validity of the Adam-Gibbs (AG) equation to glass-forming polymers by means of dynamics data from dielectric relaxation and thermodynamic data. The AG equation holds for polymers with simple monomeric chemical structure, whereas it seems to fails for more complex systems possessing secondary relaxation processes with some degree of intra-chain cooperativity. However, we found that the AG equation still works once the contribution to the excess entropy of intra-chain secondary relaxation processes uncoupled to the a process is removed. This contribution results to be essentially temperature independent.

引用

收藏

页码：614 / 620

页数：7

相关论文

共 33 条

[1] ON TEMPERATURE DEPENDENCE OF COOPERATIVE RELAXATION PROPERTIES IN GLASS-FORMING LIQUIDS [J].

ADAM, G ;

GIBBS, JH .

JOURNAL OF CHEMICAL PHYSICS, 1965, 43 (01) :139-&

[2] ALPHA-RELAXATION IN THE GLASS-TRANSITION RANGE OF AMORPHOUS POLYMERS .1. TEMPERATURE BEHAVIOR ACROSS THE GLASS-TRANSITION [J].

ALEGRIA, A ;

GUERRICAECHEVARRIA, E ;

GOITIANDIA, L ;

TELLERIA, I ;

COLMENERO, J .

MACROMOLECULES, 1995, 28 (05) :1516-1527

[3] Structure-dynamics relationship in crystallizing poly(ethylene terephthalate) as revealed by time-resolved X-ray and dielectric methods [J].

Alvarez, C ;

Sics, I ;

Nogales, A ;

Denchev, Z ;

Funari, SS ;

Ezquerra, TA .

POLYMER, 2004, 45 (11) :3953-3959

[4] Entropy and fragility in supercooling liquids [J].

Angell, CA .

JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, 1997, 102 (02) :171-185

[5] Specific heats Cp, Cv, Cconf and energy landscapes of glassforming liquids [J].

Angell, CA ;

Borick, S .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2002, 307 :393-406

[6]

[Anonymous], 1991, LIQUIDS FREEZING GLA

[7] Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior [J].

Arbe, A ;

Moral, A ;

Alegría, A ;

Colmenero, J ;

Pyckhout-Hintzen, W ;

Richter, D ;

Farago, B ;

Frick, B .

JOURNAL OF CHEMICAL PHYSICS, 2002, 117 (03) :1336-1350

[8] Dielectric relaxation in amorphous poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalene dicarboxylate) and their copolymers [J].

Bravard, SP ;

Boyd, RH .

MACROMOLECULES, 2003, 36 (03) :741-748

[9] Dynamics of polycarbonate far below the glass transition temperature:: A positron annihilation lifetime study -: art. no. 134206 [J].

Cangialosi, D ;

Wübbenhorst, M ;

Schut, H ;

van Veen, A ;

Picken, SJ .

PHYSICAL REVIEW B, 2004, 69 (13) :134206-1

[10]

Cangialosi D, UNPUB

← 1 2 3 4 →