Abstract
Toughening thermally resistant resin without sacrificing outstanding performances of original resin is still a big challenge. Herein, a novel liquid crystalline hyperbranched polysiloxane (LCPSi) with wide transition temperature range and terminal amino groups was facilely synthesized, which was then used to toughen epoxy (EP)/cyanate (CE) ester (the weight ratio of EP to CE is 1:9, coded as eCE). Results show that a small addition of LCPSi can remarkably improve the integrated performances of eCE resin including toughness, stiffness, thermal and dielectric properties. For example, the impact strength and flexural modulus of 1.5LCPSi/eCE resin (with 1.5 wt% LCPSi) are 2.3 and 1.5 times of those of eCE resin, respectively; meanwhile the initial thermal decomposition temperature (Tdi) at which the weight loss of the sample reaches 5 wt% of the former is 18.9°C higher than that of the latter; moreover, both dielectric constant and loss decrease. Those attractive performances demonstrate that LCPSi is a multi‐functional modifier of eCE resin. The origin behind was intensively discussed through the structure–property relationship. Copyright © 2015 John Wiley & Sons, Ltd.
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