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Ultrasonic-aided Extrusion Process for Recycling of Rubbers and Copolymerization of Polymer Blends
( A. I. Isayev ) 한국고무학회 2003 엘라스토머 및 콤포지트 Vol.38 No.1
N/A This paper describes recent advances in ultrasonic devulcanization technology and the in · Situ ultrasonic compatibilization of the blends of the immiscible polymers by making copolymers at the interfaus and their vicinities and our understanding of the mechanism of these processes.
Lee, Ho-Sang,Isayev, A.I. Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.1
A computer code was developed to simulate the filling stage of an injection/compression molding process using a finite element method. The constitutive equation was the compressible Leonov model and the PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. Simulations of a disk under different processing conditions, including variations of the compression stroke and compression speed, were performed to determine their effects on the flow-induced birefringence. Simulated pressure traces were also compared to those obtained in conventional injection molding and with experimental data from the literature.
Numerical Simulation of Flow-Induced Birefringence
Ho-Sang Lee,A. I. Isayev 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.1
A computer code was developed to simulate the filling stage of an injection/compression molding process using a finite element method. The constitutive equation was the compressible Leonov model and the PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. Simulations of a disk under different processing conditions, including variations of the compression stroke and compression speed, were performed to determine their effects on the flow-induced birefringence. Simulated pressure traces were also compared to those obtained in conventional injection molding and with experimental data from the literature.
두께가 급격히 변하는 영역에서 고분자 유동에 의한 복굴절
이호상(H. S. Lee),A. I. Isayev 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.1
A finite element analysis was carried out for a 4:1 planar contraction die for polymer melts using the viscoelastic constitutive equation of Leonov. Viscoelastic fluids showed significant differences in pressure drop and birefringence in contraction and expansion flows. The pressure drop was higher and the birefringence smaller in expansion than in contraction flow. The difference increased with increasing flow rate. The nonlinear Leonov model was shown to describe the viscoelastic effects observed in experiments.