Dr. Tat Hung Tong Profile

Dr. Tat Hung Tong

at Cornerstone Research Group Inc

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Publications (2)

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Proceedings Article | 5 May 2005 Paper

Light-activated shape memory polymers and associated applications

Ernie Havens, Emily Snyder, Tat Tong

Proceedings Volume 5762, (2005) https://doi.org/10.1117/12.606109

KEYWORDS: Polymers, Composites, Shape memory polymers, Optical alignment, Shape memory alloys, Temperature metrology, Manufacturing, Smart materials, Structural dynamics, Optical fibers

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Continuous product development and technology integration efforts using shape memory polymers (SMPs) have uncovered a need for faster response times. As with most smart materials, SMP responds to a specific stimulus. Traditionally SMP is triggered by thermal stimulus; increasing the temperature of the SMP above a Tg will transition the polymer from a glassy state to a rubbery state. The transition is reversible upon cooling below the Tg. It has been determined that many SMP applications can be significantly enhanced with non-thermal triggering. Non-thermal triggering eliminates the need for heating mechanisms and reduces cycle time. Furthermore, it has been found that with a faster response time many new applications become viable. Previous successful attempts have been made to improve response time of SMP by increasing its thermal conductivity with various thermally conductive additives1. However, thermal heating and cooling of polymers and composites of substantial thickness, thermally conductive or not, takes time. In an effort to facilitate system integration and increase the response time of SMP, researchers at Cornerstone Research Group, Inc. (CRG) have sought to eliminate the thermal dependency of SMP by developing light-activated shape memory polymer (LASMP). In this work, monomers which contain photo-crosslinkable groups in addition to the primary polymerizable groups were developed. These monomers were formulated and cured with other monomers to form LASMP. The mechanical properties of these materials, the kinetics, and the reversibility of the light-activated shape memory effect were studied. The near-, mid-, and far-term potential of this new material technology for system level applications is discussed.

Proceedings Article | 12 April 2005 Paper

Applications of liquid crystal network polymers

Tat Tong

Proceedings Volume 5741, (2005) https://doi.org/10.1117/12.592225

KEYWORDS: Liquid crystals, Polymers, Reflectors, Composites, Crystals, Optical filters, Mirrors, Adhesives, Liquids, Molecules

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Cornerstone Research Group Inc. (CRG) will present a brief overview on our recent efforts in developing liquid crystal (LC) network polymers for various applications. These efforts cover different aspects of the LC network polymer material technology in optical, structural and other novel applications. Liquid crystal network polymers have demonstrated great potential in producing high-performance optical components and smart materials, such as actuators. We will discuss the potential applications of these materials as optical filters, reflectors for lightweight space-based mirrors, and structural resins to improve toughness. The potential to capitalize on the templating capability of these materials to produce novel all-polymer conducting composites will also be discussed. Various possibilities and directions for future research and applications of liquid crystal network polymers will also be presented.

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