Composite

Strength Test

MOR (N/mm2)

MOE (N/mm2)

SP (N/mm2)

Hardness (HRB)

Phenol-formaldehyde

43.20

496.12

38.40

Brittle

H. sabdariffa-r-PF

69.99

614.40

57.60

67.00

Hs-g-poly(AN)-r-PF

67.00

660.80

54.56

69.00

Hs-g-poly(AN-co-MA)-r-PF

75.00

736.96

67.00

76.00

Hs-g-poly(AN-co-BA)-r-PF

73.60

687.44

69.76

72.00

Hs-g-poly(AN-co-AA)-r-PF

66.00

648.40

55.00

69.00

Where -r-PF refers to reinforced Phenol-formaldehyde.
Table 7: Mechanical studies of graft copolymers reinforced P-F composite vis-à-vis P-F resin.