NEUTRON-SCATTERING STUDY OF THE VIBRATION-RELAXATION CROSSOVER IN AMORPHOUS POLYCARBONATES

被引：99
作者：
BUCHENAU, U
SCHONFELD, C
RICHTER, D
KANAYA, T
KAJI, K
WEHRMANN, R
机构：
[1] KYOTO UNIV, CHEM RES INST, UJI, KYOTO 611, JAPAN
[2] BAYER AG, D-47829 KREFELD, GERMANY
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.73.2344
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on neutron scattering observations of the fast picosecond relaxation in two amorphous polycarbonates. Contrary to previous experience, one already observes these fast relaxations far below the glass transition, at temperatures where they cannot be related to the flow process. An explanation in terms of low-barrier structural relaxations is proposed.
引用
收藏
页码：2344 / 2347
页数：4
相关论文
共 35 条
[1]   PERSPECTIVE ON THE GLASS-TRANSITION [J].
ANGELL, CA .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1988, 49 (08) :863-871
[2]   NONEXPONENTIAL RELAXATIONS IN STRONG AND FRAGILE GLASS FORMERS [J].
BOHMER, R ;
NGAI, KL ;
ANGELL, CA ;
PLAZEK, DJ .
JOURNAL OF CHEMICAL PHYSICS, 1993, 99 (05) :4201-4209
[3]   IS THERE A CORRELATION BETWEEN THE 1ST SHARP DIFFRACTION PEAK AND THE LOW-FREQUENCY VIBRATIONAL BEHAVIOR OF GLASSES [J].
BORJESSON, L ;
HASSAN, AK ;
SWENSON, J ;
TORELL, LM ;
FONTANA, A .
PHYSICAL REVIEW LETTERS, 1993, 70 (09) :1275-1278
[4]  
BUCHENAU U, 1988, SPRINGER P PHYS, V29, P138
[5]   THE SHORT-TIME DYNAMICS OF MOLECULAR LIQUIDS - INSTANTANEOUS-NORMAL-MODE THEORY [J].
BUCHNER, M ;
LADANYI, BM ;
STRATT, RM .
JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (11) :8522-8535
[6]   CRYSTAL DYNAMICS OF POTASSIUM .2. ANHARMONIC EFFECTS [J].
BUYERS, WJL ;
COWLEY, RA .
PHYSICAL REVIEW, 1969, 180 (03) :755-&
[7]   CORRELATION BETWEEN NON-DEBYE BEHAVIOR AND Q-BEHAVIOR OF THE ALPHA RELAXATION IN GLASS-FORMING POLYMERIC SYSTEMS [J].
COLMENERO, J ;
ALEGRIA, A ;
ARBE, A ;
FRICK, B .
PHYSICAL REVIEW LETTERS, 1992, 69 (03) :478-481
[8]   CROSSOVER FROM DEBYE TO NON-DEBYE DYNAMICAL BEHAVIOR OF THE ALPHA-RELAXATION OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING IN A GLASS-FORMING POLYMER [J].
COLMENERO, J ;
ARBE, A ;
ALEGRIA, A .
PHYSICAL REVIEW LETTERS, 1993, 71 (16) :2603-2606
[9]   DYNAMIC INSTABILITY OF LIQUID-LIKE MOTIONS IN A GLOBULAR PROTEIN OBSERVED BY INELASTIC NEUTRON-SCATTERING [J].
DOSTER, W ;
CUSACK, S ;
PETRY, W .
PHYSICAL REVIEW LETTERS, 1990, 65 (08) :1080-1083
[10]   LATTICE-DYNAMICS AND PHONON LINE-SHAPES IN AR-36 AT HIGH-TEMPERATURES [J].
ECKERT, J ;
YOUNGBLOOD, RW .
PHYSICAL REVIEW B, 1986, 34 (04) :2770-2776
1234