Next Article in Journal
Fibrin Hydrogels for Endothelialized Liver Tissue Engineering with a Predesigned Vascular Network
Next Article in Special Issue
The Continuum Approach to the Description of Semi-Crystalline Polymers Deformation Regimes: The Role of Dynamic and Translational Defects
Previous Article in Journal
Electrospun Cellulose Nanocrystals/Chitosan/Polyvinyl Alcohol Nanofibrous Films and their Exploration to Metal Ions Adsorption
Previous Article in Special Issue
Significant Reduction of the Friction and Wear of PMMA Based Composite by Filling with PTFE
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Polymers 2018, 10(10), 1047;

Mechanical Behavior—Microstructure Relationships in Injection-Molded Polyamide 66

MINES ParisTech, PSL Research University, CEMEF, CNRS UMR 7635, CS 10207, CEDEX, 06904 Sophia Antipolis, France
Solvay Engineering Plastics, Technyl Innovation Center, Avenue Ramboz—BP64, 69192 Saint Fons, France
Author to whom correspondence should be addressed.
Received: 28 July 2018 / Revised: 10 September 2018 / Accepted: 17 September 2018 / Published: 20 September 2018
(This article belongs to the Special Issue Mechanical Behavior of Polymers)
Full-Text   |   PDF [5359 KB, uploaded 20 September 2018]   |  


Clear relationships between the semi-crystalline microstructure of injection molding polymers and their mechanical behavior are not yet totally established for all polymers. Part of this relative lack of understanding is because an unambiguous scientific approach is difficult to build up. The processing of samples promotes a microstructure which is not uniform and can be described in various ways on different scales. This introduces uncertainty in the correlations. Most completed studies were conducted on polyolefin, which exhibits an evolution of microstructure that is quite easy to observe and to correlate to mechanical properties. This paper intends to illustrate a more diffuse case. To achieve this, combined characterizations along the flow path and throughout the thickness of a plaque as well as characterizations of the local microstructure and tensile behavior of polyamide 66 are described. The microstructure was explored in terms of skin-core structure, spherulites sizes, crystallinity ratio and lamellae organization. Mechanical properties were addressed with non-monotonic tests with the use of DIC (Digital Image Correlation) to assess true behavior. The effect of humidity is also accounted for. It is demonstrated that small changes in lamellae or interlamellar amorphous phase are likely to be responsible for non-uniform mechanical properties, whereas more macroscopic levels (skin core structure, spherulites level of crystallinity ratio) appeared to be irrelevant levels of description. Consequently, the usual simplified analyses based on optical microscopy and differential scanning calorimetry (DSC) can be inefficient in improving knowledge in that field. View Full-Text
Keywords: microstructure; mechanical properties; injection molding; polyamide 66 microstructure; mechanical properties; injection molding; polyamide 66

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Billon, N.; Giraudeau, J.; Bouvard, J.L.; Robert, G. Mechanical Behavior—Microstructure Relationships in Injection-Molded Polyamide 66. Polymers 2018, 10, 1047.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top