Microfibrillar superlattice

Fig. II. Microfibrillar superlattice with a vacancy defect (a) and a point dislocation (b) viewed in two perpendicular planes CC and DD through the point dislocation and two planes A A and BB perpendicular to the fibre axis. For simplicity of scale the microfibrils are assumed to have a quadratic cross-section. The Burgers vector as is one microfibril thickness long in the CC plane and is zero in the DD plane or in any plane EE" parallel to CC and not going through the inserted...

The ends of the microfibrils create about Itf m point vacancies in the microfibrillar superlattice (Fig. 11). Under applied tensile load they may fail first, eventually by microcrack formation so that the adjacent microfibrils have to carry a heavier load than the rest of the sample. Hence they are first candidates for rupture detectable by the rascals formed at the rupture of tie molecules in at least one amorphous layer of the microfibril affected. Depending on the ratio of axial strength to lateral adhesion of the microfibrils the microcracks will grow parallel (high ratio) or perpendicular (low ratio) to the fibre axis yielding a large number of broken, chains and radicals in the former and a small one in the latter case. Nylon is an example of the former and linear polyethylene of the latter type. 

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See also in sourсe #XX -- [ ]

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