COARSENING IN POLYETHYLENE COPOLYMER BLENDS

被引:91
作者
CRIST, B [1 ]
NESARIKAR, AR [1 ]
机构
[1] NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208
关键词
D O I
10.1021/ma00108a014
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Artificially mixed binary blends of polyethylene and hydrogenated polybutadiene are equilibrated as two liquid phases at aging temperatures T-a 140-160 degrees C. Phase separation occurs in similar to 30 s, followed by gradual coarsening of dispersed droplets during which the average particle size increases with time as (r(3)) over bar similar to Kt. The coarsening constant K is varied from 5 x 10(-8) to 1.2 x 10(-5) mu m(3)/s by changing blend components and is compared to calculated rates based on coalescence and Ostwald ripening. Quantitative agreement is obtained for all conditions, even when the two coarsening mechanisms are operating in parallel with nearly equal rates. Coalescence is favored in blends with a low-viscosity matrix, while Ostwald ripening is dominant when both solubility and diffusivity of the minority component in the matrix are large.
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收藏
页码:890 / 896
页数:7
相关论文
共 38 条
[1]   PHASE-BEHAVIOR OF BLENDS OF LINEAR AND BRANCHED POLYETHYLENES IN THE MOLTEN AND SOLID STATES BY SMALL-ANGLE NEUTRON-SCATTERING [J].
ALAMO, RG ;
LONDONO, JD ;
MANDELKERN, L ;
STEHLING, FC ;
WIGNALL, GD .
MACROMOLECULES, 1994, 27 (02) :411-417
[2]   THERMODYNAMIC INTERACTIONS IN MODEL POLYOLEFIN BLENDS OBTAINED BY SMALL-ANGLE NEUTRON-SCATTERING [J].
BALSARA, NP ;
FETTERS, LJ ;
HADJICHRISTIDIS, N ;
LOHSE, DJ ;
HAN, CC ;
GRAESSLEY, WW ;
KRISHNAMOORTI, R .
MACROMOLECULES, 1992, 25 (23) :6137-6147
[3]   INTERFERENCE OF MICROSTRUCTURE AND ISOTOPE LABELING EFFECTS IN POLYMER BLEND COMPATIBILITY [J].
BUDKOWSKI, A ;
KLEIN, J ;
EISER, E ;
STEINER, U ;
FETTERS, LJ .
MACROMOLECULES, 1993, 26 (15) :3858-3861
[4]   THE DYNAMICS OF TRANSIENT OSTWALD RIPENING [J].
CHEN, MK ;
VOORHEES, PW .
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 1993, 1 (05) :591-612
[5]   FAST MACROMOLECULES CONTROL MUTUAL DIFFUSION IN POLYMER BLENDS [J].
COMPOSTO, RJ ;
KRAMER, EJ ;
WHITE, DM .
NATURE, 1987, 328 (6127) :234-236
[6]  
FRIEDLANDER SK, 1977, SMOKE DUST HAZE, P175
[7]  
FULLMAN RL, 1953, T AM I MIN MET ENG, V197, P447
[8]  
GRAESSLEY WW, COMMUNICATION
[9]   SPONTANEOUS PINNING OF DOMAIN GROWTH DURING SPINODAL DECOMPOSITION OF OFF-CRITICAL POLYMER MIXTURES [J].
HASHIMOTO, T ;
TAKENAKA, M ;
IZUMITANI, T .
JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (01) :679-689
[10]   THEORY OF UNSYMMETRIC POLYMER-POLYMER INTERFACES [J].
HELFAND, E ;
SAPSE, AM .
JOURNAL OF CHEMICAL PHYSICS, 1975, 62 (04) :1327-1331