Characterization of fiberglass-filled diallyl phthalate plastic molding resins and molded parts
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 ..delta..H/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/sup 0/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 (T/sub g/) of the molded parts increased as cure was completed, to approx. 160 to 165/sup 0/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 T/sub g infinity/ (T/sub g/ at complete cure) of the polymer.
- Research Organization:
- Mound Facility, Miamisburg, OH (USA)
- DOE Contract Number:
- AC04-76DP00053
- OSTI ID:
- 6803471
- Report Number(s):
- MLM-2766
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
CALORIMETRY
CASTING MOLDS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COMPOSITE MATERIALS
CURING
DIMENSIONS
ESTERS
FIBERGLASS
MATERIALS
MOLDING MATERIALS
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHTHALIC ACID ESTERS
POLYMERIZATION
POLYMERS
RESINS
SEPARATION PROCESSES
THERMAL ANALYSIS
THICKNESS