Modified chain dynamics in poly(dimethylsiloxane)/silica nanocomposites

被引：47
作者：
Fragiadakis, Daniel
Pissis, Polycarpos
Bokobza, Liliane
机构：
[1] Natl Tech Univ Athens, Dept Phys, Athens 15780, Greece
[2] ESPCI, Lab Phys Chim Struct & Macromol, F-75231 Paris 05, France
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2006年 / 352卷 / 42-49期
关键词：
dielectric properties; relaxation; electric modulus; glass transition; nanoparticles; polymers and organics;
D O I：
10.1016/j.jnoncrysol.2006.02.159
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The molecular dynamics of a series of poly(dimethylsiloxane) networks filled with silica nanoparticles synthesized in situ was studied using dielectric relaxation spectroscopy. In addition to the alpha-relaxation associated with the glass transition of the polymer matrix, we observe a slower alpha-relaxation. This behavior is discussed in terms of a gradual increase of relaxation times close to the surface of the nanoparticles. The range of this effect is estimated to be around 3 nm at T-g decreasing slightly with increasing temperature. The results are discussed in rclation to molecular dynarnics simulations of supercooled liquids close to an interface, as well as experimental studies of nanoconfined -lass forming liquids and thin polymer films. (c) 2006 Elsevier B.V. All riolits reserved.
引用
收藏
页码：4969 / 4972
页数：4
相关论文
共 22 条
[1]   Confinement of molecular liquids: Consequences on thermodynamic, static and dynamical properties of benzene and toluene [J].
Alba-Simionesco, C ;
Dosseh, G ;
Dumont, E ;
Frick, B ;
Geil, B ;
Morineau, D ;
Teboul, V ;
Xia, Y .
EUROPEAN PHYSICAL JOURNAL E, 2003, 12 (01) :19-28
[2]   Effects of confinement on material behaviour at the nanometre size scale [J].
Alcoutlabi, M ;
McKenna, GB .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (15) :R461-R524
[3]   The glass transition and interfacial layer in styrene-butadiene rubber containing silica nanofiller [J].
Arrighi, V ;
McEwen, IJ ;
Qian, H ;
Prieto, MBS .
POLYMER, 2003, 44 (20) :6259-6266
[4]   Glass-transition temperature behavior of alumina/PMMA nanocomposites [J].
Ash, BJ ;
Siegel, RW ;
Schadler, LS .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 2004, 42 (23) :4371-4383
[5]   The reinforcement of elastomeric networks by fillers [J].
Bokobza, L .
MACROMOLECULAR MATERIALS AND ENGINEERING, 2004, 289 (07) :607-621
[6]   Synthesis, structure and morphology of poly (dimethylsiloxane) networks filled with in situ generated silica particles [J].
Dewimille, L ;
Bresson, B ;
Bokobza, L .
POLYMER, 2005, 46 (12) :4135-4143
[7]   The distribution of glass-transition temperatures in nanoscopically confined glass formers [J].
Ellison, CJ ;
Torkelson, JM .
NATURE MATERIALS, 2003, 2 (10) :695-700
[8]   Glass transition and molecular dynamics in poly (dimethylsiloxane)/silica nanocomposites [J].
Fragiadakis, D ;
Pissis, P ;
Bokobza, L .
POLYMER, 2005, 46 (16) :6001-6008
[9]   Dynamics of supercooled liquids in the vicinity of soft and hard interfaces [J].
He, F ;
Wang, LM ;
Richert, R .
PHYSICAL REVIEW B, 2005, 71 (14)
[10]   Characteristic length of dynamic glass transition near Tg for a wide assortment of glass-forming substances [J].
Hempel, E ;
Hempel, G ;
Hensel, A ;
Schick, C ;
Donth, E .
JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (11) :2460-2466
123