Tanabadee Boonmalert. Synthesis of epoxypolyphenylene oxide blend compatibilized by triallylisocyanurate. Master's Degree(Chemical Engineering). Kasetsart University. Office of the University Library. : Kasetsart University, 2020.
Synthesis of epoxypolyphenylene oxide blend compatibilized by triallylisocyanurate
Abstract:
Epoxy resins (EP) are widely used in electronic devices due to its low price, good processability, high thermal stability and good solvent resistance. Due to the crosslink nature EPs exhibit some drawbacks such as low crack resistance and high dielectric constant. To overcome this problem, EP can be blended with thermoplastic polymer such as poly (phenylene oxide) (PPO). PPO is a hightemperature thermoplastic polymer with good mechanical properties and extremely low dielectric constant. However, the poor compatibility of PPO and EP leads to phase separation which can limit their processability and final product properties. In this research, triallylisocyanurate (TAIC) was used as a compatibilizer in polymer blend between EP and PPO. Different ratios of EP/PPO/TAIC were varied to obtain suitable formulation with desired mechanical and thermal properties. Silica particles (30-60 phr) were also incorporated into the blends for enhanced Tg and modulus. It was found that addition of TAIC provided good compatibility between EP and PPO matrix allowing their molecular chains to come close to each other. The three allyl groups in the TAIC structure can readily react with PPO and EP molecules or selfpolymerize to form a network. Hence, higher Tg and modulus were observed with TAIC addition. However, only appropriate mixing ratios (50/50/25, 50/25/50, and 50/25/25) of EP/PPO/TAIC were found to exhibit superior properties. Excessive TAIC content can lead to reduction in Tg since unreacted TAIC can cause plasticizing effect. In addition, silica particles can significantly improve thermal and mechanical properties of EP/PPO/TAIC systems. The maximum Tg value and storage modulus were reported at silica content up to 40 phr. At higher content, agglomerations were observed and could be responsible for a decrease in Tg and modulus.
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