High Performance
Miscible Polyetherimide/Bismaleimide
Resins with Simultaneously Improved Integrated Properties Based on
a Novel Hyperbranched Polysiloxane Having a High Degree of Branching
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Abstract
Amino-terminated
hyperbranched polysiloxane (AHBSi) with high degree
of branching (= 0.8) was synthesized by a control hydrolysis of γ-aminopropyl
triethoxysilane (APTES) without using any catalyst. Besides, AHBSi
was used as the compatibilizer of the miscible polyetherimide (PEI)/bismaleimide
(BD) blend, and the influence of the content of AHBSi on the compatibility
and integrated performance of the PEI/BD blend was systematically
investigated. The corresponding investigation of the APTES/PEI/BD
system was also carried out for comparison. Results show that although
AHBSi and APTES have similar chemical segments, their different topological
structures endow them with completely different effects. AHBSi can
remarkably improve the compatibility between PEI and BD resin, and
the AHBSi/PEI/BD system not only has obviously improved toughness
and decreased brittleness while maintaining good stiffness. It also
exhibits decreased dielectric constant and loss. Conversely, the APTES/PEI/BD
system has greatly deteriorated compatibility and integrated performance.
These interesting results demonstrate that AHBSi is a super multifunctional
compatibilizer