Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 13, Pages 3392-3399Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp112284k
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Funding
- National Natural Science Foundation of China [20774019, 50873027]
- Shanghai Municipal Education Commission [09SG02]
- Shanghai Education Development Foundation
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Mechanically robust, magnetic nylon-6 nano-composites reinforced by one-dimensional (ID) carbon nano-tube (CNT)-two-dimensional (2D) clay nanoplatelet hybrids have been prepared using a simple melt-compounding technique. The direct iron-catalyzed chemical vapor deposition (CVD) growth of multiwalled CNTs utilizes iron oxide-immobilized clay nanoplatelets as substrates, carrying out in situ intercalation and exfoliation of clay nanoplatelets. By using such a hybridization and coexfoliation method, the as-obtained heterostructured hybrids used without any purification are demonstrated to be ideal and excellent nanofillers for mechanical reinforcement for fabricating nylon-6 nanocomposites, due to their homogeneous dispersion and strong interfacial interaction with the polymer matrix. The nucleation sites provided by the nanohybrids seem to be favorable to the formation of thermodynamically stable a-phase crystals of nylon-6 with much higher stiffness and hardness than gamma-form of nylon-6, namely, a silicate-induced crystal transformation from the alpha-form to the gamma-form of nylon-6 was greatly inhibited or shielded by the CNT-wrapped clay nanoplatelets. Furthermore, the nanostructured CNT-clay hybrid heterostructures containing residual iron oxide nanoparticles show novel magnetic properties in both bulk solids and polymer nanocomposites. Therefore, this can be probably developed into a facile and practical method to fabricate polymer nanocomposites with high performance and multifunctionality.
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