Preparation And Characterization Of Calcium CopperudTitanate Filled Epoxy Composites For EmbeddedudCapacitor Applicationsud

摘要

Continuous miniaturization of electronic devices result in a high demand ofudembedded capacitor that offers significant reduction in size, better dielectric andudthermal performance, reliability and lower cost. Polymer-ceramic composites haveudbeen considered as the most suitable dielectric materials for embedded capacitor. Inudthis study, ceramics such as calcium copper titanate, CaCu3Ti4O12 (CCTO) andudbarium titanate (BaTiO3) were used as fillers in epoxy thin film composites. Theudproperties of epoxy thin film composites fabricated based on different filler loadingud(5 to 20 vol%), fabrication methods such as spin coating (SC) and hot press (HP)udmethods, hybrid fillers (CCTO and BaTiO3), surface treatment of filler and variousudtypes of epoxy resins (DER 332, Epolam 2015 and OP 392) were characterized.udResults showed that CCTO/epoxy composite exhibited higher dielectric constant, Tgudand thermal conductivity compared to those of unfilled epoxy and BaTiO3/epoxyudcomposites. In the second series, CCTO filler filled epoxy composite was chosen forudfurther investigation. CCTO/epoxy composite with filler loading of up to 40 vol%udwas able to be produced by using HP method. It was found that 40 vol%udCCTO/epoxy (HP) composite has increased 55% of dielectric constant and 83% ofudstorage modulus, and decreased 69% of CTE compared to 20 vol% CCTO/epoxyud(SC) composite. Hybrid fillers composites were fabricated and results indicated thatudHybrid 70:30 showed positive hybrid effect compared to those of single fillerudcomposites; CCTO/epoxy and BaTiO3/epoxy thin film composites. After treatmentudof CCTO by silane-based coupling agent, sample with 10% treated CCTO filledudepoxy composite presented remarkable improvement with an increased 60% ofuddielectric constant than untreated CCTO/epoxy thin film composite. Based onudvarious epoxy resins, treated CCTO/OP 392 epoxy thin film composite has improvedud10% of dielectric constant and decreased 38% of CTE compared to 3M EmbeddedudCapacitor. In short, treated CCTO filled OP 392 epoxy thin film composite exhibitedudgood dielectric properties and thermal properties compared to those of untreatedudCCTO composites, hybrid fillers composites and other treated composites.