SMPU/clay nanocomposites

Fig. 4 WAXD patterns of Qoisite SOB clay and SMPU/clay nanocomposites of different clay contents, dooi = l -8nm is the d-spadng of Cloisite SOB and the numbers refer to the different clay contents in the composites. Reprinted from [77], Copyright 2007, with permission from Elsevier...

Fig. 7 Qay content dependence of maximum stress of SMPU/clay nanocomposite fibers during the cyclic thermomechnical tests for different extension% (Sm). Modified from [89]. Copyright 2008, with permission from The Polymer Society of Korea...

Nanocomposites from SMPU and clay were prepared to investigate the reinforcement effect of reactive clay by determining the modulus or strength of the... 

All fillers were dried overnight under vacuum at 120°C to eliminate any absorbed moisture. BD and PCL were also dried overnight under vacuum at 45°C. A detailed account of the method used to prepare organoclay/SMPU nanocomposite can be found elsewhere [21, 22]. In short, prepolymer was synthesized at 80°C for 2 hours. Chain extension of prepolymer with BD was carried out in Brabender Plasticorder (model EPL 7752) at 80°C for 4 minutes with 9.8x10" mol/L of tin catalyst. Organoclay was then added and allowed to react for additional 11 minutes to produce nanocomposites. Clay content was maintained at 1 and 3 wt%. Eor other composites, chain extension step was carried out at 110°C for 2 minutes before addition of CNF, CB or SiC. Filler particles were mixed for an additional 5 minutes at 140°C. The total filler content was maintained at 1, 3 and 5 wt%. The composites were compression molded at 220°C to produce specimens with thickness of 0.5 mm for testing of mechanical, thermal, and shape memory properties. 

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