Flexible epoxies for wet filament winding

Conference · Fri Sep 10 04:00:00 EDT 1976

OSTI ID:7132117

Rinde, J A; Mones, E T; Newey, H A

Filament-wound fiber-reinforced plastics are now being used in flywheels designed for storing energy. Some designs call for flexible resins as the matrix material. Epon 871, Epi-Rez 505, DER 732, DER 741, Araldite 508, Lekutherm X-80, and ATBN 1300X16 were chosen for study. Each of these materials was formulated into one or two resin systems for wet filament winding using Dow XD 7818 as the base resin, Dow XD 7114 as a reactive diluent, and Tonox 60-40 as the curing agent. Each system was formulated to have a viscosity of approximately 0.5 to 0.9 Pa's at 25/sup 0/C. Each was gelled at 70/sup 0/C for 3 h and cured at 130/sup 0/C for 5 h. Gel times for 30-g samples at 25/sup 0/C varied from 21.4 to 134.4 h, with most being between 29 and 48 h. Percent water absorption varied from 2.3 to 4.9 percent, and the glass transition temperatures (T/sub g/), as determined by thermal mechanical analysis (TMA), were in the range of 11 to 75/sup 0/C. Tensile stress/strain measurements were made on the first five resins at both 50 percent and 70 percent flexible-resin concentrations. At the 70 percent concentration level, the failure stress ranged from 1.5 to 22 MPa (220 to 3200 psi) at strains from 50 to 100+ percent.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7132117
• Report Number(s): UCRL-78278; CONF-770202-1
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250500* -- Energy Storage-- Flywheels
COMPOSITE MATERIALS
ENERGY STORAGE
EPOXIDES
FABRICATION
FIBERS
FILAMENTS
FLYWHEEL ENERGY STORAGE
FLYWHEELS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
STORAGE
TENSILE PROPERTIES