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Experimental Study on Viscoelastic Mechanical Behaviors for Anisotropic Conductive Adhesive Film

Author: ZhangShuBao
Tutor: ChenXu
School: Tianjin University
Course: Chemical Process Equipment
Keywords: Anisotropic conductive adhesive film Viscoelastic mechanical properties Creep constitutive equation DMA
CLC: O482.1
Type: Master's thesis
Year: 2009
Downloads: 56
Quote: 0
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Abstract


With the development of microelectronic packaging technology and the rise of green electronic industry, anisotropic conductive adhesive film (ACF) has attracted more and more attention as a new kind of green packaging interconnect materials. In this paper, viscoelastic mechanical properties of cured ACF were comprehensively studied on a dynamic mechanical analyzer (DMA), which was significant for ACF database and the application of ACF in microelectronic packaging.Crosslinking degree of ACF was found to be enhanced obviously after curing through comparative analysis for the microstructures of colloid before and after curing process. Dynamic mechanical properties of ACF were studied by conducting single- frequency and multi-frequency temperature sweep tests, and the results show that with the continue increase of temperature, cured ACF comes through transition of three states in turn: glass state, viscoelastic state and rubber state. Glass transition temperature increases with increasing frequency which meet the Arrhenius relationship. The glass transition temperature of ACF was determined as 149.34oC.Quasi-static mechanical behaviors of ACF were studied through tests of uniaxial tension, creep-recovery, and stress relaxation. The results show that ACF is a kind of nonlinear viscoelastic materials, and its tensile mechanical properties show obvious dependency on temperature and rate. With the increase of temperature, Young’s modulus and tensile strength decrease and ultimate strain increases. Young’s modulus and tensile strength increase and ultimate strain decreases with the increase of loading rate and strain rate. The effect of loading rate on the tensile mechanical properties of ACF is more obvious at higher temperature. The increases of temperature and load accelerate the processes of creep-recovery and stress relaxation. ACF shows linear viscoelastic properties at the moment of loading and unloading, and the strain caused at instantaneous loading fully disappears when unloading. The levels of loading strain have great effect on the process of stress relaxation under lower temperature, but almost no effect under higher temperature.A creep constitutive equation for ACF was established based on Schapery’s nonlinear viscoelastic constitutive model. Moreover, hygrothermal aging factors were added to the creep parameters to improve the established creep constitutive model for aging effects. Simulations of these two models show good prediction on the creep behaviors of ACF before and after aging, respectively.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Mechanical properties and acoustic properties
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