Rheological, crystal structure, barrier, and mechanical properties of PA6 and MXD6 nanocomposite films
Polymer Engineering and Science, ISSN: 1548-2634, Vol: 54, Issue: 11, Page: 2617-2631
2014
- 29Citations
- 14Captures
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Article Description
In this study, rheological, crystal structure, barrier, and mechanical properties of polyamide 6 (PA6), poly(m-xylene adipamide) (MXD6) and their in situ polymerized nano-composites with 4 wt % clay were studied. The extent of intercalation and exfoliation as well as type of crystals, crystallinity, and thermal transitions were investigated using X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. Dynamic rheological measurements revealed that incorporation of nanoclay significantly increases complex viscosity of MXD6 nano-composites at low frequencies, which was related to the formation of a nanoclay network and exchange reaction between MXD6 chains. The comparative study of dynamic characteristics (G′ (ω) and G″ (ω)) for aliphatic and aromatic polyamide nanocomposites with their neat resins as well as the relaxation spectra for both polymer systems confirmed the possibility of the aforementioned phenomena. Although, the crystallinity of MXD6 films was lower as compared to PA6 films, the permeability to oxygen was more than 5 times better for the former. Incorporating 4 wt% clay enhanced the barrier property, tensile modulus, and yield stress of PA6 and MXD6 nanocomposite films in both machine and transverse directions without sacrificing much puncture and tear resistances. The PA6-based films showed higher tear and puncture strength as compared to MXD6 films.
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