Page 210 - Engineering Plastics Handbook
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Polyphenylene Ether (PPE) Blends and Alloys 183
O OH OH
OH O
O H O
O
1
2 3 O
O O
OH O
O
O O O
O O
O O
4
5
O O OH
n
6
Figure 9.1 Polymerization mechanism and structure of PPE.
PPE/Polystyrene Blends—Modified PPE
The miscible blends of PPE and styrenic resins are often referred to as
modified PPE resins. The styrenic resins can vary from crystal poly-
styrene to high-impact polystyrene (HIPS).
In theory, properties of miscible blends should be additive (linear
behavior) based on the linear contribution from each polymer fraction
[16]. Some properties such as glass transition temperatures and heat
distortion temperatures exhibit near-linear behavior in PPE/PS blends,
as shown in Fig. 9.2 [17, 18].
