NDLI: Highly filled organoclay/phenolic resin nanocomposite as an ablative heat shield material

Content Provider	Springer Nature Link
Author	Kokabi, Mehrdad Paydayesh, Azin
Copyright Year	2015
Abstract	The successful return of space vehicles to the Earth’s atmosphere depends largely on the provision made for reducing the aerodynamic heat transfer to its structure. Regarding this, using charring ablative composites is more effective and economic than other methods. Some limitations are associated with the ablative composites, such as weakness of composite char structure which results in easy mechanical corrosion leading to faster surface erosion of insulator. Polymer nanocomposites, especially highly filled systems, show interesting mechanical and thermal properties. In this work, high-filled organoclay/asbestos/phenolic nanocomposite samples were prepared as prototypes. The morphology, mechanical and ablation performance of these nanocomposites were investigated and compared with those of their composite counterparts. Furthermore, toughening mechanism of such highly filled nanocomposite system was studied and its capability as ablative heat shield was discussed. The results showed that the ablation performance of the highly filled polymeric nanocomposite, with exfoliated morphology, was higher than that of the composite counterpart; up to 35 % reduction in erosion rate and above 300 % decrease in temperature in depth. These nanocomposites preserved their strength and modulus in spite of high loading of clay and showed higher toughening in comparison with composite counterpart. The toughening mechanism of the highly filled polymeric nanocomposite was distinguished as crack branching due to flake shape and strength of organoclay platelets.
Starting Page	389
Ending Page	397
Page Count	9
File Format	PDF
ISSN	10261265
Journal	Iranian Polymer Journal
Volume Number	24
Issue Number	5
e-ISSN	17355265
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal properties Polymer Sciences Toughness mechanism Mechanical properties Heat shield Ceramics, Glass, Composites, Natural Methods Highly filled nanocomposites
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Polymers and Plastics

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