The phenomenon of double yielding in polyamide 6/K resin blends

SummaryThe polyamide 6 (PA6)/K resin (K) blends of some kinds of compositions have been prepared by extrusion. During the process of tensile testing, we found that the PA6/K blend with 10% PA6 has the usual stress-strain behavior, and that the samples obtained with 30% and 50% PA6 show apparently do...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2006-07, Vol.57 (3), p.359-367
Main Authors: Jing, Bo, Dai, Wenli, Cao, Qi, Liu, Pengsheng
Format: Article
Language:English
Subjects:
Applied sciences
Chain entanglement
Entanglement
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
Plastic deformation
Polyamide resins
Polymer blends
Properties and characterization
Tensile stress
Tensile tests
Yield point
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Summary:SummaryThe polyamide 6 (PA6)/K resin (K) blends of some kinds of compositions have been prepared by extrusion. During the process of tensile testing, we found that the PA6/K blend with 10% PA6 has the usual stress-strain behavior, and that the samples obtained with 30% and 50% PA6 show apparently double yielding behavior, while the PA6/PS blend does not show the double yielding phenomenon at all same mass ratio. Considering the microscopic morphology study and results of mechanical properties of the PA6/K blends, the first yield point which occurs at the lower tensile stress might be caused by the deformation of the K resin matrix, and the second one may be correlated to the permanent plastic deformation of the entanglement of PA6 chains and PB segments within chains of K resin.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-006-0562-y