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(4) Particulate-structural Contribution to Rheology for Particle-filled Resin Composite

“New parameter for understanding the composite property”

[ Contents ]

1. INTRODUCTION

2. New parameter for understanding the composite property

[ Research Examples ]

Flame Synthesis of Aluminum Nitride Filler-powder

Particulate Structural Contribution to Viscosity of Silica Particle filled Epoxy Resin Composite System

Optical polarized detection of filler packing-structure in resin polymer composite system filled with ceramic particles

Functions of New Aerosol Multilayered Gas Sensor

1. INTRODUCTION

Semiconductor packaging material encapsulates IC chips etc., and necessitates a high thermal conductivity, a low thermal expansion and a good moldability. Higher the packing content of filler, higher the thermal conductivity (lower the thermal expansion); but then, the moldability degrades.

There is a keen interest to clarify the relevance of primary properties of silica particles onto rheological characteristics of the resin polymer composite filled with SiO₂ particles. As a rule of thumb, a largish SiO₂ primary particle size or a smallish specific surface area decreases the viscosity of the composite system, because the resin supplied on the particle surface per unit weight apparently increases. These works could empirically show some intrinsic SiO₂ filler primary-properties for lowering viscosity; such as the broader size distribution, the lower viscosity. However, that was highly stereotyped, and there might be remained other intrinsic silica-properties which affected the viscosity.

2. New parameter for understanding the composite property

We are studying about a new parameter, “particulate surface structural contribution”, such as fine-particle amounts adhered onto a core-particle. It was referred as representing the strategy for improvement of polymeric materials, which was a mandatory-clause in resin composite systems filled with SiO₂ particles; not to mention ordinary ceramic materials. One of important differences in ordinary ceramic materials and resin composite systems was as to the sintering of constituent particles being carried out or not. Primary properties of raw powder could conceivably affect rather in resin system characteristics directly, but they were backward region. To pack densely the commercialized raw powder in resin system, various particle treatments to make more spherical shape are commonly applied for commercialized powder. The flame conditions, e.g., fuel/oxidizer ratio, flame temperature, gas flow rate and precursor constituents, should affect the morphology. The treatment could also affect the particulate surface structure. Thus far, there were very little concerns on it, and few linkage studies to connect microscopically the particulate surface structural contribution and rheological properties in resin systems; although many reports were presented on particle size distribution at seeing in broad perspective, likely as Hosfield model of the distribution.

Particulate Structural Contribution to Viscosity of Silica Particle filled Epoxy Resin Composite System

Details are presented the below website.

http://www.catchword.com/titles/vsp/09218831/v12n1/contp1-1.htm

(“Advanced Powder Technology”, the international journal of the Society of Powder Technology, Japan. Published jointly with the Society of Powder Technology, Japan.)