Conference Programme

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Overview
Session
CC-04: Symp CC
Time:
Tuesday, 20/Jun/2017:
1:30pm - 3:30pm

Session Chair: Kin Liao, Khalifa University
Session Chair: Liying Zhang, Nanyang Technological University
Location: Rm 301

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Presentations
1:30pm - 2:00pm
Invited

Stimulus-responsive Polymers and their Multifunctional Composites: Smart Structures and Applications

Jinsong LENG, Yanju LIU

Harbin Institute of Technology, China

Stimulus-responsive polymers are currently a hot topic in smart materials. The future prospects and range of applications for these materials are wide-reaching, and will attract attention from interested readers in a broad range of fields. Shape memory polymers (SMPs) and Electro-Active Polymer (EAP) as a class of stimulus-responsive materials have attracted great attention. SMPs and their composites exhibit shape change and shape recovery properties in response to various external stimuli.SMPs and their composites have been developed with many advantages, including fast response, long lifetime, high resilience, light weights, stretchable, low cost and easy processing.Potential applications span all scale sizes from nano-scale devices through to macro-level products, drawing on cross-discipline research from fields including mechanics, materials, chemistry, photonics, biomedicine etc. Future applications are potentially far-reaching and includes areas such as automobiles, robotics, aerospace, biomedical engineering, smart clothing, soft and flexible electronic device, and even smart everyday products (e.g. bowl, spoon, spanner etc.). SMPs can be made to react to all kinds of environmental stimuli including heat, water, solvents, electric/magnetic fields, microwave, light, etc. Moreover, in order to guide the fabrication of high performance dielectric elastomer (DE) actuators, the constitutive model, electromechanical stability, snap-through stability and failure of DE and its composite are investigated. The rolled, folded, inflated and stacked actuators of DE have been fabricated and their properties are also investigated. The energy harvest device and Braille display are fabricated based on the stacked actuators, and their performance is demonstrated. Such materials are hence of intense interest to researchers in a wide range of disciplines and are the focus of much current activity and investment. These materials offer promise for future smart products in many areas of science and technology. The ability to fabricate deformable structures with programmable shape-change properties has the potential to significantly impact many areas of our life.


2:00pm - 2:30pm
Invited

Development of Electronic Packaging Encapsulation Materials for Harsh Environment

Chee Lip GAN, Eric Jian Rong PHUA, Jacob Song Kiat LIM, Ming LIU, Xiao HU

Nanyang Technological University, Singapore

The rapid adoption of electronics in increasingly diverse applications has placed more requirements on the packaging of the devices to ensure their functionality during operation. This can be the high temperature, high pressure or corrosive environment that is experienced in aerospace, automotive or oil drilling industry. As a result, new advanced electronic packaging materials are required to enhance chip functionality and survivability in such harsh environment.

In this presentation, some non-conventional electronic packaging materials are examined for such potential applications. Filler shapes and effects are studied through the use of cyanate esters on standard ceramic substrates with particular attention on their adhesion properties and their thermal degradation behaviour at high temperatures. For thermosets such as PN, material strength was evaluated through mechanical measurements such as nanoindentation and thermomechanical testing and was compared to state-of-the-art epoxy encapsulation. In line with increasingly stringent environmental regulations, non-halogenated POSS-based epoxy composites with intrinsic flame retardancy and excellent thermomechanical properties were recently investigated as electronic encapsulants.


2:30pm - 2:45pm
Oral

Combining Self-Healing and Anticorrosion

Daniel CRESPY

Vidyasirimedhi Institute of Science and Technology, Thailand

Corrosion as an economic plague

Corrosion, the degradation of metals, is extremely costly. It is calculated that in most of the countries corrosion is responsible for a loss of money equal to 3-5% of their Gross National Products. In Thailand, it corresponds to ~ 107 Billion Bahts in 2011. Therefore, there is a huge interest in developing materials that can efficiently hinder and stop corrosion.

Our Answer from Materials Science to Hinder Corrosion

We created redox-responsive nanocontainers that can selectively release corrosion inhibitors.1 The nanocontainers are designed so that the corrosion inhibitors are released only upon on the onset of corrosion. Thus, when corrosion does not occur, the inhibitors are kept in the nanocapsules and are not leaking in the environment. The nanocontainers could be embedded in polymer coatings that were deposited on metal substrates. Corrosion of the metal was then artificially induced and the coating was found to efficiently hinder it.2-3

References:

[1] L.P. Lv, Y. Zhao, N. Vilbrandt, M. Gallei, A. Vimalanandan, M. Rohwerder, K. landfester, D. Crespy, J. Amer. Chem. Soc. 2013, 135, 14198.

[2] A. Vimalannandan, L.P. Lv, T.H. Tran, K. Landfester, D. Crespy, M. Rohwerder, Adv. Mater. 2013, 25, 6980.

[3] H. Tran, A. Vimalanandan, G. Genchev, J. Fickert, K. Landfester, D. Crespy, M. Rohwerder, Adv. Mater. 2015, 27, 3825.


2:45pm - 3:00pm
Oral

Circularly Polarized Light Creates Molecular Chirality of Polymers

Tamaki NAKANO

Institute for Catalysis, Hokkaido University, Japan

Interactions between substances and light play important roles in life. One of the most important aspects is photosynthesis by plants and other organisms. In photosynthesis, sugars and molecular oxygen are produced from carbon dioxide and water where photon energy drives the reaction. Moreover, in artificial chemical synthesis, light promotes various reactions that are not driven by thermal energy. Further, in reactions where chiral compounds are produced, non-racemic products can be obtained using circularly polarized light (CPL). We recently reported that a preferred-handed helical conformation is induced for poly(9,9-dioctylfluorene-2,7-diyl, a linear polyfluorene derivative, in the solid state when the polymer is irradiated with CPL. The mechanism of this chirality induction involves a twisted-coplanar transition (TCT) of an aromatic–aromatic junction in the polymer where one of the enantiomeric, right- and left-handed twists is preferentially excited into the coplanar conformation. TCT through photo excitation was first predicted for biphenyl through theoretical calculations.

In the CPL-driven helix formation of the linear polyfluorene derivative, strong inter-chain interactions were important in effectively induce chirality, which in turn implicates that polymers with weak inter-chain interactions cannot be subjected to the CPL method. This weak point of the CPL method was over come via using aid molecules which reinforce or simulate inter-chain interaction. This method was realized for a star-shaped fluorene oligomer which had been designed to have only weak inter-chain interactions. The applicability of the CPL method was thus largely extended.

In addition, as a new target molecule for the CPL method, 1,10-bi(2-naphthol) (BINOL) was recently studied. In order to confirm that BINOL can undergo TCT, we irradiated optically active (R)-BINOL with non-polarized light and investigated the structures of the products and found that (R)-BINOL undergo photo-induced racemization and polymerization at the same time.


3:00pm - 3:15pm
Oral

Silica Anti-corrosion Thin Film for Metal Protection

Shang-Tien TSAI1, WenChyuan CHANGJEAN1, Pei-Hsiun CHAO1, Tseng-Chang TSAI2

1Hawing GemS Technology Corporation, Taiwan; 2National University of Kaohsiung, Taiwan

Application of silica thin film for the protection for metal surface from the corrosion by NaCl, H2SO4 and NaOH solution has been demonstrated. Silica film in the structure of zeolite, mesoporous oxide and nano-particle forming a strong barrier could hinder the penetration of aggressive species.


3:15pm - 3:30pm
Oral

UV Absorption, Mechanical and Optical Behavior of Zinc Oxide Containing Poly (Vinyl Alcohol - g – Acrylonitrile) Nanocomposites Films for Skin Protection

Shikha CHOUHAN1, Anil BAJPAI1, Ravi KATARE2, Jaya BAJPAI1

1Bose Memorial Research Lab, Department of Chemistry, Government Science College Jabalpur, India; 2Department of Physics, Government Model Science College Jabalpur, India

UV absorption, mechanical and optical properties of PVA-g-PAN/ZnO nanocomposite films prepared by free radical graft copolymerization of acrylonitrile on to PVA and subsequent in situ precipitation of ZnO nanoparticles into the polymer matrix are reported in this abstract. The nanocomposites were characterized by various analytical methods such as FTIR, Raman spectroscopy, DSC, SEM and AFM etc. The size of the crystallites and extent of crystallinity were ascertained by XRD analysis. The SEM with EDX showed that the ZnO nanoparticles were uniformly dispersed within the host co-polymer matrix. TEM results clearly indicated that the size of zinc oxide nanoparticles varied in the range 10–30 nm. The UV-absorption properties of so prepared films were also studied using UV-visible absorption spectroscopy. UV absorption, transmittance and reflection spectra of PVA-g-PAN/ZnO nanocomposites suggest that small amounts of ZnO in the composite films are get high UV shielding above 95% UV absorption, 4% reflection and only 1% transmittance. The results reveal an excellent UV absorption at around 380 nm by nanocomposite films. These results supported to prepared nanocomposite film may be useful for UV protecting devices for defense, high altitude places, UV protecting crème for skin and other possible applications also. PL measurements reveal the existence of defects in the synthesized nanocomposites films. The antibacterial activities of so prepared nanocomposites were determined against the Gram-negative and Gram-positive bacterium. The mechanical properties of the nanocomposites were also studied.



 
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