Page 342 - Engineering Plastics Handbook

300 Engineering Plastics

TABLE 13.4 Typical Room Temperature Mechanical Properties of Polysulfone,
Polyethersulfone, and Polyphenylsulfone
Property ASTM test method PSF PES PPSF
a b
Tensile (yield) strength, MPa D-638 70.3 83.0 70.0
Tensile modulus, GPa c D-638 2.48 2.60 2.30
Elongation at yield, % D-638 5.7 6.5 7.2
Elongation at break, % D-638 75 40 90
Flexural strength, MPa D-790 106 111 105
Flexural modulus, GPa D-790 2.69 2.90 2.40
Compressive strength, MPa D-695 96 100 99
Compressive modulus, GPa D-695 2.58 2.68 1.73
Shear (yield) strength, MPa D-732 41.4 50 62
Notched Izod impact, J/m d D-256 69 85 694
e
Unnotched Izod impact D-256 NB NB NB
2 f
Tensile impact, (kJ/m ) D-182 420 340 400
Poisson ratio, at 0.5% strain — 0.37 0.39 0.42
Rockwell hardness D-785 M69 M88 M86
g
Abrasion resistance, mg/1000 cycles D-1044 20 19 20
a
Tensile, flexural, and impact properties based on 3.1-mm-thick ASTM specimens.
b
To convert MPa to psi, multiply by 145.
c
To convert GPa to psi, multiply by 145,000.
d
To convert J/m to ft⋅lbf/in, divide by 53.38.
e
No break.
f 2 2
To convert kJ/m to ft⋅lbf/in , divide by 2.10.
g
Taber abrasion test using CS-17 wheel and 1000-g load for 1000 cycles.
NOTE: These and other properties reported throughout, as well as the summary of possible
applications for these resins, are based on the best available information. Inclusion of the
information is not intended to be taken as a recommendation for a particular use or as an
endorsement of any particular material.
The room temperature mechanical properties of bisphenol-A, bisphenol-
S, and biphenol-based polysulfones are given in Table 13.4. The tensile
and flexural properties of these three polymers are fairly comparable with
some subtle exceptions. Because PES is a more rigid molecule, the polymer
exhibits higher strength and stiffness than do PSF and PPSF. The yield
elongation for PPSF is higher than that of PES or PSF. One of the unique
features of PPSF is its “supertough” behavior, which is exhibited by a high
notched Izod impact strength. In addition, it is able to maintain much of
this ductility, which assists with effective impact energy absorption and dis-
sipation after exposure to prolonged heat and moisture.
The tensile and flexural properties can be enhanced by the addition of
common fibrous reinforcing fillers such as chopped glass fiber or carbon
fiber. Although these fillers offer an increase in strength and stiffness, such
improvements can come with a reduction in impact resistance. Fortunately,
glass-fiber-reinforced polysulfones still offer practical toughness. The ambi-
ent temperature mechanical properties for reinforced PSF, PES, and PPSF
are presented in Table 13.5.