Accession Number : ADA078838


Title :   Synthesis of Improved Polyester Resins.


Descriptive Note : Final rept.,


Corporate Author : ACUREX CORP MOUNTAIN VIEW CA AEROSPACE SYSTEMS DIV


Personal Author(s) : McLeod ,A H ; Delano,C B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a078838.pdf


Report Date : 05 Jul 1979


Pagination or Media Count : 91


Abstract : Eighteen aromatic unsaturated polyester prepolymers prepared by a modified interfacial condensation technique were investigated for their solubility in vinyl monomers and ability to provide high char yield forming unsaturated polyester resins. The best resin system contained a polyester prepolymer of phthalic, fumaric and diphenic acids reacted with 2,7-naphthalene diol and 9,9-bis(4-hydroxphenyl) fluorene. This prepolymer is very soluble in styrene, divinyl benzene, traillyl cyanurate diallyl isophthalate and methylvinylpyridine. It provided anaerobic char yields as high as 41 percent at 800 c. The combination of good solubility and char yield represents a significant improvement over state-of-the-art unsaturated polyester resins. The majority of the other prepolymers had only low or no solubility in vinyl monomers. Graphite composites from this prepolymer with styrene were investigated. The cause for the observed low shear strengths of the composites was not determined, however 12 week aging of the composites at 82 C showed that essentially no changes in the composites had occurred. (Author)


Descriptors :   *PHYSICAL PROPERTIES , *SYNTHESIS(CHEMISTRY) , *POLYESTER PLASTICS , AGING(MATERIALS) , POLYMERS , COMPOSITE MATERIALS , STYRENES , GRAPHITE , MONOMERS , SOLUBILITY , THERMOSETTING PLASTICS , SHEAR STRENGTH , VINYL PLASTICS , PHTHALIC ACIDS , CHARRING , BENZENE COMPOUNDS , FLUORENES


Subject Categories : Physical Chemistry
      Polymer Chemistry
      Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE