By Dr. Louis A. Pilato, Michael J. Michno (auth.)
Advanced composite fabrics or excessive functionality polymer composites are an strange classification of fabrics that own a mix of excessive energy and modulus and are considerably greater to structural metals and alloys on an equivalent weight foundation. The e-book presents an outline of the foremost elements which are thought of within the layout of a composite, of floor chemistry, of analyses/testing, of structure/property relationships with emphasis on compressive power and harm tolerance. Newly rising assessments, relatively open gap compression exams are anticipated to supply higher coverage of composite functionality. This e-book is an "up-to-date" therapy of innovative parts of composite know-how with literature reviewed until eventually lately and comprises thermoplastic prepregs/composites and significant software areas.
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Extra resources for Advanced Composite Materials
Variations of PMR-15 Extension ofthe P13N and PMR-15 technology by NASA Langley researchers resulted in relatively solvent free systems, LARC-160 and LARC-13. The former was a melt processable oligomer from the reaction of diethyl ester of 3,3',4,4' benzophenone tetracarboxylic acid, nadic acid and a liquid eutectic amine mixture of methylene dianiline, known as Jeffamine (Eq. 6 Ar = Jeffamine). With a Mn of about 1600 gjmole, LARC 160 is a melt processable composition which processes like an epoxy resin but the thermooxidative stability of LARC-160 is lower than PMR-15 .
Besides use in aircraft due to FST characteristics, PF resin and modified PF resins are the resins of choice in high performance ballistic composite components that incorporate S-2 Glass or Kevlar aramid fibers. 85) to form a solid, low melting thermoplastic material, known as a novolak, or by a base catalyzed reaction of phenol with formaldehyde to form a resole resin. The amount of formaldehyde may vary from less than a molar ratio to more than 3 moles of formaldehyde to phenol (Eq. 1). 1 P Crosslinked resin ,.
22). A more stable polymer with improved thermal and oxidative stability (as compared to phenolic resin) is obtained with a T g greater than 300 oc, good retention of mechanical properties above 300 oc and a char yield of 70% at 1000 oc. The authors claim that the PT resin is comparable to PMR-15 and other related high performance thermoset systems for high temperature use above 316 oc. CNCI tertiary amine NOVOLAK- 0 '( N ";"( 0- NOVOLAK NYN 0 I NOVOLAK Equation 22 Co-reaction of cyanate esters with epoxies, BMI resins and high performance thermoplastic resins has expanded the utility of cyanate esters.
Advanced Composite Materials by Dr. Louis A. Pilato, Michael J. Michno (auth.)