Glass-cloth-reinforced composites were prepared from prepolymers of various weight ratio blends of the state-of-the-art propargylether-terminated ester-imide (1) and bismaleimide (MB-8000). The Tg of a composite is directly related to the weight ratio of MB-8000 present. The composites demonstrated excellent initial mechanical properties. The chemical and electrical properties under severe long-ageing conditions were demonstrated.
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