Accession Number : AD0467049


Title :   A CORRELATION OF POLYMERIC STRUCTURE TO ABLATIVE PROPERTIES


Descriptive Note : Technical rept


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Fleming, Gerald J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/467049.pdf


Report Date : 29 Apr 1965


Pagination or Media Count : 43


Abstract : The work contained in this report encompasses an attempt to correlate the chemical and physical structure of a polymer with its ablative performance. A broad range of epoxy resins and curing agents were employed as model systems. Various tools such as 'alpha rod' testing, thermogravimetric analysis, crosslink density studies, and infrared-red spectroscopy were used in making this correlation. The epoxy novolac type resin performed the best of all the epoxy resins in the 'alpha rod' oxy-acetylene torch test while nadic methyl anhydride performed as the best curing agent for epoxy resins under these ablative conditions. The use of a refractory filler such as SiO2 was found to be necessary for good performance. The mechanism through which this filler aids the ablative properties of materials is explained with the help of photomicrographs.


Descriptors :   *ABLATION , *HEAT RESISTANT PLASTICS , *EPOXY RESINS , STABILITY , AGING(MATERIALS) , ADDITIVES , TORCHES , INFRARED SPECTRA , DIOXIDES , COPOLYMERIZATION , PYROLYSIS , LABORATORY EQUIPMENT , SILICON COMPOUNDS , MOLECULAR STRUCTURE , POLYMERS , ANHYDRIDES , AMINES


Subject Categories : Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE