Enthalpic Relaxation of Silica-Polyvinyl Acetate Nanocomposites

被引:25
作者
Amanuel, Samuel [1 ]
Gaudette, Anna N. [1 ]
Sternstein, S. S. [2 ]
机构
[1] Union Coll, Dept Phys & Astron, Schenectady, NY 12308 USA
[2] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
关键词
ageing; calorimetry; glass transition; nanocomposites; reinforcement;
D O I
10.1002/polb.21593
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Although the effects of filler nanoparticles size and surface treatment on the glass transition temperature of the matrix phase have received well-deserved attention, nanofiller effects on other physical parameters associated with the glass transition have received less interest. To better understand how the incorporation or nanofillers affects the enthalpic relaxations associated with the glass transition, differential scanning calorimeter measurements were carried out on silica-polyvinyl acetate nanocomposites with respect to filter content, annealing temperature, and annealing period. As expected, longer annealing periods below the glass transition temperature resulted in an increase of the subsequent enthalpic relaxations. However, the presence of filler substantially reduces the enthalpic relaxation relative to that of the neat polymer at longer annealing periods only. The underlying enthalpic relaxations and the effects suppressed by the fillers are specific to the annealing temperature. These results suggest a significant alteration in the physical state of the matrix because of the presence of the filler particles. However, this does not imply the existence of a glassy layer or layers with a glass transition gradient near the filler surface. (C) 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2733-2740, 2008
引用
收藏
页码:2733 / 2740
页数:8
相关论文
共 26 条
[1]   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
[2]   Glass transition behavior of alumina/polymethylmethacrylate nanocomposites [J].
Ash, BJ ;
Schadler, LS ;
Siegel, RW .
MATERIALS LETTERS, 2002, 55 (1-2) :83-87
[3]   Evidence for the shift of the glass transition near the particles in silica-filled elastomers [J].
Berriot, J ;
Montes, H ;
Lequeux, F ;
Long, D ;
Sotta, P .
MACROMOLECULES, 2002, 35 (26) :9756-9762
[4]   Effect of silica nanoparticles on the local segmental dynamics in poly(vinyl acetate) [J].
Bogoslovov, R. B. ;
Roland, C. M. ;
Ellis, A. R. ;
Randall, A. M. ;
Robertson, C. G. .
MACROMOLECULES, 2008, 41 (04) :1289-1296
[5]   Modulus recovery kinetics end other insights into the Payne effect for filled elastomers [J].
Chazeau, L ;
Brown, JD ;
Yanyo, LC ;
Sternstein, SS .
POLYMER COMPOSITES, 2000, 21 (02) :202-222
[6]   ANALYSIS OF STRUCTURAL RELAXATION IN GLASS USING RATE HEATING DATA [J].
DEBOLT, MA ;
EASTEAL, AJ ;
MACEDO, PB ;
MOYNIHAN, CT .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1976, 59 (1-2) :16-21
[7]   POLYMER-FILLER INTERACTIONS IN RUBBER REINFORCEMENT [J].
EDWARDS, DC .
JOURNAL OF MATERIALS SCIENCE, 1990, 25 (10) :4175-4185
[8]   Effect of free surfaces on the glass transition temperature of thin polymer films [J].
Forrest, JA ;
DalnokiVeress, K ;
Stevens, JR ;
Dutcher, JR .
PHYSICAL REVIEW LETTERS, 1996, 77 (10) :2002-2005
[9]   Aging phenomena in poly(methyl methacrylate) thin films: Memory and rejuvenation effects [J].
Fukao, K ;
Sakamoto, A .
PHYSICAL REVIEW E, 2005, 71 (04)
[10]   THE GLASS-TRANSITION OF ORGANIC LIQUIDS CONFINED TO SMALL PORES [J].
JACKSON, CL ;
MCKENNA, GB .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 1991, 131 :221-224