Study On The Cyanate Ester Composites For Integrated Circuit Board

With the high speed development of information industry, the new generation microelectronic materials used in substrates, package materials, and interlayer dielectric were desired for the need of the high power, density, integrating and working speed of the micro-electronic element. The materials must possess the low dielectric constant and dielectric loss, low thermal expansion coefficient, and excellent mechanical and thermal properties. Cyanate ester resins with the unique chemical structures endow them with good perporties, such as the high performance of mechanical properties, low water up-takes, good thermal and high temperature performance and low out-gassing, especially perfect dielectric properties. So cyanate esters resin is useful as substrates in advanced IC board. However, like most other thermosets, they have suffered the drawback of brittleness. In this dissertation the BCE/BMI substrates were prepared by using the pre-polymer of bismaleimide (BMI), which was the mixture of bismaleimide, 2, 2'-diallylbisphenoI A (DBA) and an active thinner, to modify Bisphenol-A dicyanate (BCE). Then the BCE/BMI/nano-SiO₂ composites were prepared. And the nano-SiO₂ was treated by the different silane coupling agents (KH-560, JH-53 and KH-550). The effects of the intersurface on the properties of the BCE/BMI/nano-SiO₂ composites were investigated. The following aspects were studied.(1) The reactions between BMI and BCE were studied with FTIR and DSC. The reactive mechanism of BMI/BCE was discussed. The results showed that there were possibly three reactions in whole system: the reaction of self-polymerization of CE; the reaction of self-polymerization of BMI; the co-reaction between CE and BMI. A kinetic analysis of BMI/BCE had been carried out by DSC. Non-isothermal DSC scans of the experimental data obtained. Some parameters of the curing technology , which included curing temperature: 176.0℃, post-curing temperature: 214.1℃ and gel temperature: 139.1 ℃, were given. The activation energy, frequency factor and reaction order were caculated by Kissinger, Crane, Ozawa methods. Their values were 39.27kJ·mor^-1, 2773.9s^-1and 0.83, respectively. The mechanical properties and thermal properties of the CE/BMI system with the different content of BMI were investigated by dynamic mechanical analysis (DMA), thermo-gravimetric analysis (TGA) and the impact and flexural tests. The results showed that the BCE/BMI system had good impact strength and flexural strength. When the content of BMI was 33.3 wt %, the impact strength and...