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Nylon 6 / Montmorillonite Nano masterbatch natural Preparation and properties of composite materials

Author: AnXiaoShan
Tutor: QianXin
School: Zhejiang University of Technology
Course: Materials Physics and Chemistry
Keywords: Nylon 6 Montmorillonite Nano masterbatch Preparation Performance Characterization
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 182
Quote: 1
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Abstract


In this paper, nylon 6 / montmorillonite nano masterbatch natural in situ polymerization method and water-assisted melt intercalation process, and by the masterbatch melt mixed directly with the nylon 6 composites prepared were characterized. Cation exchange capacity of experiment used 90-120mmol/100g natural sodium montmorillonite, in situ polymerization process, by stirring, ultrasonic other means, so caprolactam monomer in deionized water and montmorillonite intercalation effectively, heating dried premix, and ultimately through anionic polymerization of the monomer between layers of montmorillonite interlayer spacing will stretch even peeled off to obtain nano masterbatch; the water-assisted melting of the manufacturing process, the resulting MMT slurry flotation added at a suitable rate to the molten nylon matrix, and as water is both a natural montmorillonite intercalation agent and the plasticizer is a natural nylon, nylon 6 has a molecular chain of natural montmorillonite strong interaction, through the composite middle course between expansion and vaporization of water desorption of water molecules caused by entropy compensate, and with the shearing action of external forces, so that the natural montmorillonite dispersed in a nylon matrix. Through these two master batch prepared by the method of composite materials by XRD and TEM analysis to prove the natural montmorillonite in nylon matrix to achieve nanoscale dispersion. Nylon 6 / Montmorillonite Nanocomposites natural heating and cooling in the DSC curve shows the crystallization of nylon 6 MMT for heterogeneous nucleation played a role in promoting the nylon 6γ crystal formation, making nylon 6 crystallization temperature rises, subcooling smaller, narrower width of the crystallization peak crystallization rate increases. Test results show that the mechanical properties of materials prepared by the mother of nylon 6 / montmorillonite nanocomposites than pure nylon 6 has been significantly improved, the use of 15% and 30% of the MMT content of parent material and nylon 6, respectively, 1:4 and the dilution ratio of 1:9, two composites of nylon 6 as compared with the tensile strength was increased by approximately 24% and 11% modulus was increased by 49.8% and 22.9%, respectively, improved flexural strength nearly 66.6% and 26%, flexural modulus were increased by 85% and 16.7% respectively. Meanwhile, heat distortion temperature has also been significantly increased. Compared to pure nylon 6, the two composites in heat distortion temperature under a pressure 0.45MPa respectively of 45.9 ℃ and 30.6 ℃, which were increased by 39.5% and 26.3%; under pressure at 1.8MPa were increased 15.6 ℃ and 8.6 ℃, both were increased by 37.9% and 20.9%. Masterbatch prepared nylon 6 / montmorillonite nanocomposites natural and pure nylon 6 rheological behavior indicates that they all belong to pseudoplastic fluid, non-Newtonian index of the former than the latter, the apparent viscosity of the former than the latter.

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