NDLI: A New Silicon-Containing Bis ( Cyanate ) Ester Resin with Improved Thermal Oxidation and Moisture Resistance ( Preprint )

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A New Silicon-Containing Bis ( Cyanate ) Ester Resin with Improved Thermal Oxidation and Moisture Resistance ( Preprint )

Content Provider	Semantic Scholar
Author	Roxanne Quintana Connor, Dan
Copyright Year	2006
Abstract	A new cyanate ester monomer was prepared from bis(4-cyanatophenyl)dimethylsilane (SiMCy) and fully characterized by analytical and spectroscopic techniques. The monomer was found to have a melting point about 20 °C lower than that of the commercial bis(4-cyanatophenyl)dimethylmethane (BADCy) with similar melt viscosity, curing kinetics, and post-cure glass transition temperature. Analysis of the single-crystal molecular structure by xray diffraction showed that intermolecular packing was dominated by weak hydrogen-bonding attractions between the aromatic rings and the –OCN nitrogen atoms. In contrast, the packing interactions found in BADCy are dominated by dipole-dipole interactions of the OCN groups. These differences may explain the 50% reduction in moisture uptake observed in SiMCy as compared to BADCy during exposure to boiling water. In addition, thermogravimetric analysis revealed that SiMCy exhibited a significantly higher char yield in air than BADCy, presumably due to the formation of silicates at high temperature. The combination of improved thermooxidative stability and reduced moisture absorption without significant loss in ease of processing Distribution A: Approved for public release; distribution unlimited 2 or mechanical properties makes SiMCy an important potential “drop in” replacement for BADCy, and demonstrates the power of the molecular level approach to designing new hightemperature polymer materials. Distribution A: Approved for public release; distribution unlimited
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.dtic.mil/dtic/tr/fulltext/u2/a468069.pdf
Language	English
Access Restriction	Open
Subject Keyword	AROMATICS Cyanates Esters Fever Hydrogen Interaction Kinetics Internet Protocol Melting Point NG-Nitroarginine Methyl Ester Oncology Certified Nurse Polymer Pyschological Bonding Resin Ring device Set packing Silicates Silicon Thermal oxidation X-Ray Diffraction biphenyl synthase activity monomer negative regulation of sinapate ester biosynthetic process
Content Type	Text
Resource Type	Article

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