Uniaxial orientation behavior and consideration of the geometric anisotropy of polyurea hard domain structure in flexible polyurethane foams

被引:34
作者
Kaushiva, BD [1 ]
Wilkes, GL [1 ]
机构
[1] Virginia Polytech Inst & State Univ, Dept Chem Engn, Polymer Mat & Interfaces Lab, Blacksburg, VA 24061 USA
关键词
polyurethane foam; hard domain morphology; atomic force microscopy;
D O I
10.1016/S0032-3861(99)00860-5
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Atomic force microscopy (AFM) and wide angle X-ray scattering (WAXS) were used to examine the morphology of hard domains in flexible polyurethane foams and plaques based on slabstock formulations. Ln plaque samples that were uniaxially deformed to 50% elongation, WAXS was utilized to demonstrate transverse hard se ment orientation relative to the axis of deformation. AFM was utilized to directly observe the morphology of the foams and plaques. Micrographs from this technique present, for the first time in polyurethane foam systems, lamellae-like structures ca. 0.2 mu m long and ca. 10 nm across. These structures are believed to be precipitates of polyurea hard segments and are considered to be responsible for the orientation behavior presented. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:6987 / 6991
页数:5
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