Adhesion of Polymer Interfaces Reinforced with Random and Diblock Copolymers as a Function of Geometry
Adhesion of Polymer Interfaces Reinforced with Random and Diblock Copolymers as a Function of Geometry
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无规和二嵌段共聚物增强的聚合物界面的粘附力随几何形状的变化
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发表时间：
1999
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影响因子：
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通讯作者：
T. Russell
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文献类型：
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作者：
B. Bernard;H. Brown;C. Hawker;A. Kellock;T. Russell
采用非对称双悬臂梁（ADCB）试验研究了不相容均聚物界面上无规共聚物薄层的增强效应。在这种几何形状中，可以改变均聚物基底的厚度，从而控制裂纹尖端处的剪切应力强度与拉伸应力强度的比率（混合度）。聚苯乙烯（PS）和聚甲基丙烯酸甲酯（PMMA）的组成均聚物和PS/PMMA无规共聚物使用。在传播的裂纹，Gc，（界面的断裂能）中耗散的能量，强烈地依赖于在ADCB样品的不对称程度，以及在界面处存在的共聚物的量和类型。在Gc中的最小值发生在PS与PMMA梁的厚度比为约1.2处。对于较低和较高的厚度比，额外的能量耗散在子银纹。裂纹在无规共聚物层和PS层之间以一条与试样几何形状无关的路径扩展。
The reinforcement effect of a thin layer of random copolymer at the interface between immiscible homopolymers was studied using an asymmetric double cantilever beam (ADCB) test. In this geometry, one can change the thickness of the homopolymer substrates and thus control the ratio of shear to tensile stress intensity (the mixity) at the crack tip. Polystyrene (PS) and polymethylmethacrylate (PMMA) were the constituent homopolymers and PS/PMMA random copolymers were used. The energy dissipated in propagating the crack, Gc, (the fracture energy of the interface), depends strongly on the degree of asymmetry in the ADCB sample, as well as the amount and type of copolymer present at the interface. A minimum in Gc occurred at a thickness ratio of the PS to PMMA beams of about 1.2. For both lower and higher thickness ratios, extra energy was dissipated in subsidiary crazes. The crack was found to propagate between the layer of random copolymer and the PS on a path that was quite independent of the sample geometr...