Synthesis of aralkyl novolac epoxy resins and their modification with polysiloxane thermoplastic polyurethane for semiconductor encapsulation

Abstract

A series of phenol-based and naphthol-based aralkyl epoxy resins were synthesized by the condensation of p-xylylene glycol with phenol, o-cresol, p-cresol, or 2-naphthol, respectively, followed by the epoxidation of the resulting aralkyl novolacs with epichlorohydrin. The incorporation of stable dispersed polysiloxane thermoplastic polyurethane particles in the synthesized epoxy resin's matrix was achieved via epoxy ring-opening with the isocyanate groups of urethane prepolymer to form an oxazolidone. The mechanical and dynamic viscoelastic properties of cured aralkyl novolac epoxy resins were investigated. A sea-island structure was observed in all cured rubber-modified epoxy networks via SEM. The results indicate that a naphthalene containing aralkyl epoxy resin has a low coefficient of thermal expansion, heat resistance, and low moisture absorption, whereas phenol aralkyl type epoxy resins are capable of imparting low elastic modulus result in a low stress matrix for encapsulation applications. Modification of the synthesized aralkyl epoxy resins with polysiloxane thermoplastic polyurethane have effectively reduced the stress of cured epoxy resins, whereas the glass transition temperature was increased because of the formation of the rigid oxazolidone structure.

Allyl ether of aralkyl phenolic resin with low melt viscosity and its Alder-ene blends with bismaleimide: synthesis, curing, and laminate properties

“…The presence of closely packed aromatic nuclei and the short linkages formed by methylene groups make polyaralkyl phenolics highly brittle that impede their widespread utility in high performance composites. These problems associated with polyaralkyl phenolics may be alleviated by suitable chemical modifications and blending . Allyl‐BMI Alder‐ene systems are well explored and documented…”

“…These problems associated with polyaralkyl phenolics may be alleviated by suitable chemical modifications and blending. [10,11] Allyl-BMI Alder-ene systems are well explored and documented. [12,13] This paper investigates the possibility of modification of polyaralkyl phenolics with allyl groups that is capable of reacting with BMI.…”

Production and Characterization of BaTiO3 / Epoxy Composite Materials for Capacitor Applications

“…Epoksi reçinelerinin kimyasal dirençleri (sıcaklık, çözücü, nem, v.b. ) (Ho and Wang, 1999). Teknolojinin gelişmesi nedeniyle mikroelektronik yatırımlar hızla artmış bununla birlikte düşük elastik modül ve yüksek dayanım, düşük iç gerilim ve düşük termal genleşme, düşük su adsorbsiyonu, yüksek dielektrik sabiti ve yüksek termal dayanım özellikleri epoksi\BaTiO3 kompozitleri ortaya çıkarmıştır (Lin et al, 2003).…”

Curing Behaviour of Epoxy Resin with a Diamine Containing Heterocyclic Rings

“…Amine-cured epoxies are one of the most commonly used matrix materials in engineering applications for fi bre reinforced polymeric matrix composites due to their excellent engineering performance 1,2 . Curing with aromatic diamines having a rigid structure is known to improve the thermal resistance of epoxy resins.…”