THEORY OF CHAIN PULL-OUT AND STABILITY OF WEAK POLYMER INTERFACES .1.

Citation
L. Kogan et al., THEORY OF CHAIN PULL-OUT AND STABILITY OF WEAK POLYMER INTERFACES .1., Macromolecules, 29(11), 1996, pp. 4090-4100
Citations number
21
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
00249297
Volume
29
Issue
11
Year of publication
1996
Pages
4090 - 4100
Database
ISI
SICI code
0024-9297(1996)29:11<4090:TOCPAS>2.0.ZU;2-Z
Abstract
Polymer/polymer interfaces reinforced with block copolymers or grafted chains can fail by the pull-out of these chains. A number of constitu tive models have been proposed in the literature to describe the pull- out of a single chain. In this paper, we use these models to construct a continuum theory of a weak interface, and we study the stability of such an interface subjected to a homogeneous deformation. We show tht if the perturbation contains a Fourier component with wavelength exce eding wa critical value Lambda(c), then the homogeneous deformation is unstable. The dependence of Lambda(c), on the geometry, the stiffness of the material outside the interface, and the pull-out models is der ived. We also study the stress field near the tip of a preexisting int erface crack using the different pull-out models.