Abstract:

Objective　To investigate if the Ribbond polyethylene fiber has the effect of reinforcing polymethyl methacylate. Methods　28 specimens were fabricated and divided into 3 groups : group of chemical-cured PMMA, group of chemical-cured PMMA reinforced by stainless steel wire and group of chemical-cured PMMA reinforced by Ribbond polyethylene fiber. A three- point bending test was used to measure the flexural strength and flexural modulus of specimens. Then the data were analyzed with a one-way analysis of variance.Results　The flexural strength of chemical-cured PMMA group was (51·383±2·761) MPa,the flexuralmodulus was (179 1·2±113·760) MPa; The flexural strength of stainless steel wire reinforced group was (58·725± 1·218) MPa, the flexural modulus was (209 2·76±120·28) MPa; The flexural strength of Ribbond polyethylene fiber reinforced group was (80·975±2·58) MPa,the flexural modulus was (286 6·53±107·51) MPa。The one-way analysis of variance showed that the resultswere significant (P<0·001). Newman-Keulsmethod showed thatthe differences among all groupswere significant (P<0·05).Conclusion　The Ribbond polyethylene fiber can raise the flexural strength and flexural modulu of polymethyl methacylate.

Key words: fiber-reinforced composite material, 3-point bending test, polyethylene fiber, resin