Optimizing MDT Resin: The Impact of T/D Ratios and End-capping Agents on Performance

In this study, trimethoxyphenylsilane and methylphenyldimethoxysilane were utilized as raw materials, while hexamethyldisiloxane and divinyltetramethyldisiloxane served as capping agents. Vinylphenyl MDT resin was synthesized through two distinct processes: hydroxyl prepolymer capping and vinyl prepolymer dehydroxylation. The investigation focused on the effects of varying T/D ratios, the timing of capping agent addition, and the influence of Hexamethyldisiloxane working as end-capping agents on the mechanical properties, optical properties, and thermal stability of MDT resin. It was found that when T/D = 0.4, the elongation at break of PMDT-2 resin reached 126%. Conversely, at T/D = 0.8, the tensile strength of PMDT-4 resin achieved 5.06 MPa, with a transmittance at 450 nm of 90.8% and a 5% mass loss temperature of 437 °C. The MDT silicone resin prepared via the dehydroxylation of vinyl prepolymer exhibited enhanced control over vinyl content and viscosity. Notably, the vinyl content of PMDT-10 reached 5.33wt%, with a 5% mass loss temperature of 449.1 °C and a tensile strength of 8.52 MPa. This accomplishment has led to the development of an innovative preparation process for MDT resin. The resultant MDT resin exhibits exceptional properties, making it a promising candidate for application in electronic packaging. This advancement offers novel possibilities for material selection within this domain.