Dewetting instabilities in thin block copolymer films: Nucleation and growth

被引:91
作者
Limary, R
Green, PF [1 ]
机构
[1] Univ Texas, Dept Chem Engn, Austin, TX 78712 USA
[2] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA
关键词
D O I
10.1021/la981693o
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We examined the dynamics of dewetting of a thin symmetric diblock copolymer film on a substrate above the bulk order-disorder transition temperature, T-ODT. Of the copolymer using atomic force microscopy. The dewetting mechanism proceeded with the formation of discrete holes without their characteristic peripheral rims. During this early stage, the hole radii R increased exponentially with time. This stage was followed by a narrow intermediate regime where the rim develops and R similar to t. When the rim was fully developed, R increased as t(2/3). The shape of the rim was highly asymmetrical and its width L increased as t(1/2). At the final stage of the process, droplets of the copolymer, a few microns in diameter and with heights on the order of tens of nanometers, existed on a dense copolymer "brush" of uniform thickness 7 nm anchored to the substrate. This clearly indicates that the process is autophobic, a phenomenon first documented in small molecule liquids.
引用
收藏
页码:5617 / 5622
页数:6
相关论文
共 25 条
[1]   BLOCK COPOLYMER THERMODYNAMICS - THEORY AND EXPERIMENT [J].
BATES, FS ;
FREDRICKSON, GH .
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 1990, 41 (01) :525-557
[2]   Dewetting of supported viscoelastic polymer films: Birth of rims [J].
BrochardWyart, F ;
Debregeas, G ;
Fondecave, R ;
Martin, P .
MACROMOLECULES, 1997, 30 (04) :1211-1213
[3]   WETTING AND SLIPPAGE OF POLYMER MELTS ON SEMI-IDEAL SURFACES [J].
BROCHARDWYART, F ;
DEGENNES, PG ;
HERVERT, H ;
REDON, C .
LANGMUIR, 1994, 10 (05) :1566-1572
[4]  
COULON G, 1989, MACROMOLECULES, V22, P5677
[5]   VISCOUS BURSTING OF SUSPENDED FILMS [J].
DEBREGEAS, G ;
MARTIN, P ;
BROCHARDWYART, F .
PHYSICAL REVIEW LETTERS, 1995, 75 (21) :3886-3889
[6]   Influence of grafting density on wall slip of a polymer melt on a polymer brush [J].
Durliat, E ;
Hervet, H ;
Leger, L .
EUROPHYSICS LETTERS, 1997, 38 (05) :383-388
[7]   Unstable polymer bilayers .1. Morphology of dewetting [J].
Faldi, A ;
Composto, RJ ;
Winey, KI .
LANGMUIR, 1995, 11 (12) :4855-4861
[8]   AUTOPHOBIC LIQUIDS AND THE PROPERTIES OF THEIR ADSORBED FILMS [J].
HARE, EF ;
ZISMAN, WA .
JOURNAL OF PHYSICAL CHEMISTRY, 1955, 59 (04) :335-340
[9]   Dewetting at the liquid-liquid interface [J].
Lambooy, P ;
Phelan, KC ;
Haugg, O ;
Krausch, G .
PHYSICAL REVIEW LETTERS, 1996, 76 (07) :1110-1113
[10]   Wall slip in polymer melts [J].
Leger, L ;
Hervet, H ;
Massey, G ;
Durliat, E .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1997, 9 (37) :7719-7740