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Introduction


The Polymer Rheology and Processing Laboratory of Chang Gung University was founded by Formosa Plastic Group, one of the chemical giants in the world as well as the biggest chemical company in Taiwan with an annual sale of over 8 billions U.S. dollars. The Laboratory is housed within the Department of Mechanical Engineering at Chang Gung University. Research Funding includes grants and contracts from Nation Science Council of Taiwan, R.O.C., Ministry of Economic Affairs, Administration of Health, Ministry of Defense, and various corporations including Formosa Plastic Group. Chang Gung University is situated in Lin-Kuo/Tao-Yuan (20km south of Taipei City), the center of Taiwan industrial region and is noted for its strong emphasis in science and engineering and for its problem solving partnerships with industry.

Today polymer processing presents substantial challenges for industry. The complexity of shear thinning and viscoelastic behavior of polymer melts, the unevenness of flow distribution and the existence of large strain rates and temperature gradients pose some very difficult problems. The ever increasing product specifications and narrow tolerances are leading resin producers, processors and process equipment manufacturers to advanced technology for problem solving.

Faculty members, research engineers, and graduate students are working together in out laboratory to advance the knowledge base for polymer rheology and processing. Polymer Rheology and Processing Laboratory is led by Dr. Shih-Jung Liu, author of various publications and a frequent lecturer and consultant to the industry. Various researches on polymer rheology and processing are being conducted in our laboratory. Current research topics include:


@Polymer Rheology
Sintering rheology of semi-crystalline polymers.
Investigation of the extensional viscosity of thermoplastics
On-line measurement of the rheological properties of instant cereal.
 
Injection Molding and Gas Assist Injection Molding
Modeling and simulation of the warpages in injection molded parts.
A new viscoelastic phase transformation model to simulate the residual stress in injection molded thermoplastics.
Investigation of the weldlines in gas assist injection molded parts.
Fiber exposure phenomenon in gas assist injection molding.
 
Thermoforming and Blow Molding
Modeling and simulation of the vacuum forming of wood fiber filled thermoplastic composites.
Process optimization of the thermoforming of PP/CaCO3 composites.
Computer simulation of the inflation process in blow molding.
 
Rotational Molding
Optimize the mechanical property of rotationally molded parts.
An experimental study of foamed polyethylene in rotational molding.
Experimental investigation and theoretical analysis of the warpages in rotationally molded parts.
Experimental investigation of the rotational molding of fiber reinforced thermoplastics.
 
Ultrasonic Welding
Optimize the joint strength in ultrasonic welding of thermoplastics.

Development of weldability diagram for ultrasonic welding of thermoplastics.

 
Medical Engineering
In vitro elution of vancomycin from biodegradable beads.
Processing of biodegradable polymers as a drug delivery system.

Stress analysis of vascularized fibular transfer in large defect reconstruction.

3-D finite element analysis of vascularized fibular transfers.
 
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