Page 195 - Engineering Plastics Handbook

168 Engineering Plastics

TABLE 8.3 Comparative Properties for BPADA-MPD PEI Resin at Various Levels of
Glass Reinforcement
10% Fiber- 20% Fiber- 30% Fiber- 40% Fiber-
Properties glass glass glass glass

HDT at 0.5 MPa 223 (434) 226 (438) 228 (442) 234 (454)
(66 psi ), °C (°F)
HDT at 1.9 MPa 207 (405) 209 (408) 212 (414) 208 (406)
(264 psi), °C (°F)
T g ,°C (°F) 217 (425) 217 (425) 217 (425) 217 (425)
Tensile stress Y, MPa (kpsi) 114 (16.6) 139 (20.1) 169 (24.5) 186 (27.0)
Tensile modulus, MPa (kpsi) 4482 (650) 6895 (1000) 8963 (1300) 11,721 (1700)
% Elongation 4.5 3.0 3.0 2.5
Flexural modulus, MPa (kpsi) 4482 (650) 6205 (900) 8963 (1300) 11,721 (1700)
Flexural stress, MPa (kpsi) 193 (28.0) 207 (30.0) 228 (33.0) 248 (36.0)
N. Izod, J/m (ft⋅lb/in) 59 (1.1) 91 (1.7) 107 (2.0) 107 (2.0)
% Ash 10 20 30 40
Specific gravity 1.34 1.42 1.51 1.61

Other forms of glass commonly used in PEI resin include chopped
fiber, milled glass, glass beads, and glass flake. Glass fibers provide the
best stiffness and strength (with longer fibers providing higher values
but more orientation effects). Shorter-aspect-ratio glass fillers (e.g.,
milled glass and glass bead) produce parts with more isometric prop-
erties. Said another way, these lower-aspect-ratio fillers produce less
anisotropy (less orientation of the filler) in the final molded part.
PEI resins can also be blended with numerous mineral fillers such as
talc, clay, wollastonite, titanium dioxide, barite, and mica. In general,

30% GF PEI
7000 10% GF PEI
PEI (T = 217°C)
g
Storage modulus (MPa) 4000
6000
5000

3000
2000
1000
0
25 75 125 175 225
Temperature (°C)

Figure 8.3 Storage modulus versus temperature for neat PEI resin and PEI
at various levels of glass loading.