| New Insights into Structure-Property Relationships in Thermosetting Polymers from Studies of Co-Cured Polycyanurate Networks (Preprint) |
19 Dec 2011 |
109 pages |
| Authors:
Andrew J Guenthner; Kevin R Lamison; Vandana Vij; Josiah T Reams; Gregory R Yandek; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE SPACE AND MISSILE PROPULSION DIV/PROPULSION MATERIALS APPLICATIONS BRANCH
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 | Studies of the physical properties of the co-cured networks formed from three similar dicyanate ester monomers revealed a number of unexpected variations from simple linear mixing rules. These variations shed light on important synergistic effects in co-cured thermosetting networks and their possible causes. The monomers utilized were the dicyanate esters of Bisphenol A (BADCy), Bisphenol E (LECy), and the silicon-containing analog of Bisphenol A (SiMCy). The most important of the ... |
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| Effects of Silicon Substitution in the Main Chain Network Segments of Polycyanurates |
29 Nov 2011 |
4 pages |
| Authors:
Andrew J Guenthner; Kevin R Lamison; Josiah T Reams; Vandana Vij; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE SPACE AND MISSILE PROPULSION DIV/PROPULSION MATERIALS APPLICATIONS BRANCH
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| The incorporation of silicon into thermosetting polymers at the molecular level has been shown to have several significant effects, beyond improving thermo-oxidative stability, as demonstrated by studies of silicon-containing cyanate ester resins. These effects are generally traceable to the enhanced flexibility afforded by the substitution of C-Si and C-C bonds, and include increased free volume and thermal expansion. In cyanate esters, the increased specific volume leads to a decrease in ... |
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| Cyanate Ester Graphene Oxide Composites |
29 Nov 2011 |
4 pages |
| Authors:
Josiah T Reams; Andrew J Guenthner; Kevin R Lamison; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE SPACE AND MISSILE PROPULSION DIV/PROPULSION MATERIALS APPLICATIONS BRANCH
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| Graphene has received much attention recently as a material for improvement of polymeric nanocomposite properties due to its outstanding strength, stiffness, high thermal and electrical conductivity and gas impermeability. Recent investigations of cyanate ester resins as high temperature resin materials for space and propulsion applications have brought attention to the need for high temperature composite materials with improved stiffness, strength, hot/wet performance and high maximum use temperatures. The incorporation of ... |
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| High Temperature Composite Resins: Re-Writing the Rules for Thermosetting Polymers |
20 Sep 2011 |
22 pages |
| Authors:
Andrew Guenthner; Kevin R Lamison; Josiah T Reams; Vandana Vij; Gregory R Yandek; Matthew C Davis; Michael E Wright; Lee R Cambrea; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| This is a presentation for the the SAMPE High Desert Conference, about high temperature composite resins and re-writing the rules for thermosetting polymers. |
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| The Role of Concurrent Chemical and Physical Processes in Determining the Maximum Use Temperature of Thermosetting Polymers for Aerospace Applications |
29 Aug 2011 |
18 pages |
| Authors:
Andrew Guenthner; Kevin R Lamison; Gregory R Yandek; Kenneth C Masurat; Josiah T Reams; Lee R Cambrea; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| This is a presentation for the American Chemical Society's Fall National Meeting, about the role of concurrent chemical and physical processes in determining the maximum use temperature of thermosetting polymers for aerospace applications. |
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| The Influence of Monomer Chemical Structure on Late-Stage Cure Kinetics of Dicyanate Ester Resins |
03 May 2011 |
13 pages |
| Authors:
Andrew J Guenthner; Josiah T Reams; Kevin R Lamison; Lee R Cambrea; Vandana Vij; Joseph M Mabry; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| In the production of structures made from reinforced cyanate ester resins, nearly complete cyclotrimerization of the resin with concomitant macromolecular network formation must be achieved in order to ensure adequate mechanical performance and durability of the structures. In the course of developing a wide variety of new cyanate ester resins, as well as in studies of co-cured blends, it has become apparent that some resins can be fully cured into ... |
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