Kinetics of chain organization in ultrathin poly(di-n-hexylsilane) films

被引:166
作者
Despotopoulou, MM
Frank, CW
Miller, RD
Rabolt, JF
机构
[1] STANFORD UNIV,DEPT CHEM ENGN,STANFORD,CA 94305
[2] IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120
关键词
D O I
10.1021/ma9511964
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The effect of film thickness on the organization kinetics of ultrathin (50-1000 Angstrom thick) spin-cast polymer films was studied using poly(di-n-hexylsilane) and UV absorption spectroscopy. We found an extensive reduction in the crystallinity as well as a reduction in the rate of crystallization for film thicknesses below 500 Angstrom resulting from the constrained geometry. Modeling using polymer crystallization theories elucidated the surface-induced phenomena. We found that the dimensionality of the growth depended both on the film thickness and on the crystallization temperature. At low crystallization temperatures (below 0 degrees C) and for films thicker than 220 Angstrom, the nucleation is bulk and However, at higher crystallization temperatures (above 3 degrees C) and for low film thickness (below 150 Angstrom), the growth is one-dimensional and heterogeneous nucleation becomes important. For 500 Angstrom thick films, the transition between the two nucleation regimes occurs abruptly around 3 degrees C.
引用
收藏
页码:5797 / 5804
页数:8
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