Sung C. – TechConnect Briefs

Interfacial Instabilities in Multilayer Extrusion

Ho K., Lee J.S., Viriyabanthorn N., Sung C., Barry C.M.F., Mead J.L., University of Massachusetts-Lowell, US

Polymeric alternating multilayer laminates have been prepared by coextrusion, utilizing a specially designed feedblock to combine the two incoming materials from different extruder. Layer multiplying elements (LME) were used to split the melt stream, divide [...]

Processing Parameters Affecting Nanoinjection Molding

Srirojpinyo C., Yoon S-H, Lee J., Sung C., Mead J.L., Barry C.M.F., University of Massachusetts-Lowell, US

Although micro parts and features are routinely molded, the performance of polymer melts is not well understood when the part wall thickness is less than 1 mm. In this study, the effects of molding conditions [...]

Investigation of Tooling Surfaces on Injection Molded Nanoscale Features

Yoon S-H, Srirojpinyo C., Lee J., Sung C., Mead J.L., Barry C.M.F., University of Massachusetts at Lowell, US

The composition and surface properties of tooling materials become more critical as the size of the molded features decreases [1, 2]. This work investigates the effect of tooling surfaces with micro and nanoscale features. These [...]

Phase Identification and Elastic Property of Blend Copolymer Characterized by Force Modulation Microscopy and Force-Distance Curve

Kang B., Lee J.S., Pham L., Sung C., University of Massachusetts-Lowell, US

The technique of polymer blending has been used to create new types of polymers with desirable properties in the past decade. Force Modulation Microscopy (FMM) provides a local contrast due to the local elasticity difference [...]

DOE Optimization and Phase Morphology of Electrospun Nanofibers of PANI/PMMA Blends

Desai K., Sung C., University of Massachusetts-Lowell, US

Electrospinning is a process by which sub-micron polymer fibers can be produced using an electrostatically driven jet of polymer solution. The fibers are collected as a non-woven mat or membrane with high surface area to [...]

Uniform Polycarbonate Nanofibers Produced By Electrospinning

Kattamuri N., Sung C., University of Massachusetts, US

In the present work electrospinning of polycarbonate has been performed to produce nanofibers.Parameters like concentration,voltage,flow rate and distances were varied and an optimum condition of all the parameters was achieved to generate uniform ,smooth nanofibers [...]

Phase Morphology Control in Electrospun Nanofibers From Polymer Blends

Wei M., Kang B., Sung C., Mead J., University of Massachusetts-Lowell, US

Nanofibers of polybutadiene/polycarbonate blends were electrospun from polymer solutions. The effect of composition on the resulting internal morphology of the nanofibers was studied using Transmission Electron Microscopy (TEM). When the composition ratio of PB/PC blends [...]