Direct correlation between interfacial width and adhesion in glassy polymers

被引:134
作者
Schnell, R
Stamm, M
Creton, C
机构
[1] Max Planck Inst Polymer Res, D-55021 Mainz, Germany
[2] Ecole Super Phys & Chim Ind Ville Paris, Lab Physicochim Struct & Macromol, F-75231 Paris 05, France
关键词
D O I
10.1021/ma971020x
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 correlation between interfacial width and adhesion, as expressed by the fracture toughness of the interface, in glassy polymers is investigated. The interfacial width is measured accurately by neutron reflectivity, and the fracture toughness of the interfaces is determined from a double cantilever beam test. Two experimental situations are considered: the case of an interface between two immiscible polymers, polystyrene (PS) and poly(p-methylstyrene) (PpMS), and the case of a PS-PS interface, where the interfacial width and the fracture toughness are measured for different interdiffusion times. In both cases, a direct correlation between the fracture toughness and the interfacial width is found. After an initial rapid increase in toughness due presumably to chain-end diffusion, most of the subsequent increase in toughness occurs over a relatively narrow range of interfacial widths between 9 and 12 nm. The fracture toughness stays constant with further interdiffusion. The results are consistent with respect to a model where formation of entanglements is the determining factor for the development of adhesive strength at the interface.
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页码:2284 / 2292
页数:9
相关论文
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