Accession Number : ADA305078

Title :   Characterization of Fiberglass-Filled Diallyl Phthalate Plastic Molding Resins and Molded Parts,

Corporate Author : MOUND LAB MIAMISBURG OH

Personal Author(s) : Whitaker, Ruth B. ; Glaub, Jerome E. ; Bonekowski, Nicholas R. ; Gillham, Philip D.

PDF Url : ADA305078

Report Date : 01 DEC 1980

Pagination or Media Count : 27

Abstract : Characterization of diallyl phthalate (DAP) molding resins was undertaken by differential scanning calorimetry (DSC) and by combined size exclusion chromatography (SEC)/low angle laser light scattering (LALLS) in order to better predict moldability and storage life limits. Completeness of cure of molded parts, before and after any 'post-curing,' was also determined by thermal analysis. Molecular weights and molecular weight distributions of the DAP molding resins by SEC/LALLS indicated that the 'better' molding resins have lower M sub w/M sub n ratios. Association effects were observed, which could not be overcome by solvent modification alone. Determination of DAP molding resin heats of reaction by DSC indicated a linear relation between deltaH sub R and weight percent filler for the 'good' molding resins. DSC analyses of molded DAP parts showed that 95% cure was achieved in some as-molded parts, with a post-cure temperature of 165 C being required to complete the cure to 100%. Thickness of the parts was a factor, with the thicker parts being 100% cured as molded. The glass transition temperature of the molded parts increased as cure was g completed, to approx. l60-l65 C maximum. These results are consistent with a model of thermoset resin curing behavior which states that 100% cure can be achieved only if a post-curing operation is conducted above the transition temperature of the polymer.

Descriptors :   *PLASTICS, *MOLDING MATERIALS, THICKNESS, FIBERGLASS, LIFE EXPECTANCY(SERVICE LIFE), POLYMERS, POLYMERIZATION, MOLECULAR WEIGHT, GLASS, TRANSITION TEMPERATURE, CURING, PHTHALATES, CHROMATOGRAPHY, THERMOSETTING PLASTICS, CALORIMETRY, HEAT OF REACTION.

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE