Post cure behaviour of encapsulants for QFN packages processed by an open-ended single mode resonant microwave applicator

Abstract

An open-ended single mode resonant microwave applicator has been developed for the curing of encapsulants materials used for microelectronic packaging. Post cure behaviour of Henkel™ E01080 encapsulant material has been studied by Differential Scanning Calorimetry (DSC), Attenuated Total Reflectance Fourier-Transform Infrared (ATR-FTIR) analysis and Dynamic Mechanical Analysis (DMA). DSC based measurement of the microwave cured samples indicates a ~ 99.2% degree of cure and a glass transition temperature, Tg, of 113°C for a sample cured at 150°C for 90 seconds. For the corresponding convection oven cured sample the degree of cure was found to be approximately 70% for the same duration of cure. The ATR-FTIR analysis showed no significant difference between the conventionally and microwave cured samples. Thermal ageing analysis performed on fully conventional and microwave cured samples showed similar ageing behaviour for both samples at a given temperature under Tg

Universal Adhesives- Different Curing Methods and Applications

“…In the second step, the formed secondary amine reacts with another epoxy group to produce a hydroxyl group and a tertiary amine. Opening of the epoxy ring by an amine to form OH and CN groups [14]. It seems that the chemical mechanism of microwave curing is essentially similar to that of heat curing.…”

A Methodology for Remote Microwave Sterilization Applicable to the Coronavirus and Other Pathogens Using Retrodirective Antenna Arrays

“…The microwave open ended cavity system used for the heat experiments was originally developed to enable rapid bonding of individual microelectronic components on a board assembly [17], [35], [36]. This system has an advantage of volumetric and uniform heating, selective energy deposition with reduced processing times and increased energy efficiency.…”

“…This system has an advantage of volumetric and uniform heating, selective energy deposition with reduced processing times and increased energy efficiency. Microwave heating was achieved using this open-ended single mode resonant microwave applicator/oven which has been described in [35]. Test specimens consist of 200 µl of Cov-229E-GFP diluted to a multiplicity of infection (MOI) of 0.3 in DMEM, in a cuvette of internal volume 8 mm × 8 mm × 8 mm.…”