Spectroscopic and mechanical studies of glass-fiber-reinforced composites

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5219460

Liao, Y T

Fourier Transform Infrared Spectroscopy was used to characterize the interface bondings in glass fiber-reinforced composites. The pH of the treating solution affects the interfacial chemical bonding significantly. The natural pH of the treating solution gives the maximum amount of the interfacial chemical bondings. The temperature of the curing process has little effect on the amount of the interface bonding but does affect the final extent of cure. The reaction rate constant between the epoxy resins and the silanes on the glass is much larger than that of the epoxy polymerization. At high pH and low pH, undesirable side reactions occur in the composite interface that lead to the consumption of reactants and a decrease in the amount of the interface bonding. It has been found that the amount of interface bondings is related to the interfacial shear strengths for three different coupling agents. The effects of silane coupling agents on the failure mechanisms of unidirectional glass fiber-reinforced composites was investigated by static bending tests and fracture characterized by the scanning electron microscope. The interlaminar shear strengths agree with the results of the fiber pull-out tests for AAPS, MAPS, and APS coupling agents. The flexure strengths and the interlaminar shear strengths increase as the interface strengths increase. The silane coupling agents increase the interlaminar shear strengths more significantly than the flexure strengths.

• Research Organization: Case Western Reserve Univ., Cleveland, OH (USA)
• OSTI ID: 5219460
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BONDING
COMPOSITE MATERIALS
CURING
EPOXIDES
FABRICATION
FIBERS
GLASS
HYDRIDES
HYDROGEN COMPOUNDS
INTERFACES
JOINING
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
RESINS
SILANES
SILICON COMPOUNDS