The role of crystallinity and reinforcement in the mechanical behavior of polyamide-6/clay nanocomposites

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DOIResolve DOI: http://doi.org/10.1002/pen.11082
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TypeArticle
Journal titlePolymer engineering and science
ISSN0032-3888
Volume42
Issue9
Pages18971906; # of pages: 10
AbstractThe mechanical behavior of compression-molded polyamide-6 (PA6) reinforced with 2 wt% of organo-nanoclay (montmorillonite intercalated with ?-amino dodecanoic acid) has been studied and compared to that of PA6. The tensile strength and the Young's modulus of the PA6/clay were 15% higher than those of PA6. Differential scanning calorimetry, Fourier transform infrared spectroscopy, and X-ray diffraction showed that the crystalline structures of PA6 and PA6/clay differed considerably. A crystallinity of 25% with a dual structure composed of the ? and ? forms was obtained in PA6/clay, while a crystallinity of 31% with the a form as the dominant crystalline structure was obtained in PA6. To understand the role of the crystalline structure of PA6, the molding process was modified to obtain PA6 specimens with different levels of crystallinity and different crystalline forms. Quenching molten PA6 at a cooling rate sufficiently high to prevent crystallization gave a material that was predominantly amorphous (crystallinity of 7%) with traces of the mesomorphic ? or ?* form. Annealing this material at 80�C considerably increased crystallinity to 21%, which was also of the mesomorphic ? or ?* form. PA6 with a predominant crystalline ? form could not be generated. Comparisons with PA6/clay in terms of crystallinity and mechanical behavior lead to the conclusion that the improvements in rigidity and strength observed when montmorillonite is added to PA6 are related to the reinforcing filler and not to a modification of the crystalline structure.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences; NRC Industrial Materials Institute
Peer reviewedNo
Identifier10007283
NPARC number12338978
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Record identifier29f6ce83-1589-4825-b5d2-e9f53dfdbb0c
Record created2009-09-11
Record modified2016-05-09
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