6^th International Conference on Smart Materials & Structures April 16-17, 2018 Las Vegas, Nevada, USA

Xinwei Wang has completed his PhD at 2007 from Donghua University. He is now the Vice Chief Engineer of Technology and Research Center and member of Technical and Economic Committee in Shanghai Research Institute of Chemical Industry.He has been rewarded 2017 Shanghai Outstanding Technology Leader,2017 Houdebang Chemical Industry Award, First Prize of Shanghai Technological Invention 2016, Shanghai Youth Rising-star Award. He has published more than 20 research papers and 10 patents, which lead to more than 3 billion dollar economic benefits in downstream industries

Ultra-high molecular weight polyethylene is a kind of resin with excellent physical, chemical, mechanical properties and low price.With high mechanical strength and gel-like structure when melting,UHMWPE lithium ion battery separators show better safety properties than traditional separators. In this work, UHMWPE separators were prepared by thermally induced phase separation (TIPS), using liquid paraffin (LP) as diluent. Specified UHMWPE resin for LiB separators with 1.2 million viscosity molecular weight in average was produced by Shanghai Research Institute of Chemical Industry and used as raw material.Th e UHMWPE resin was dissolved by LP under heat and shear of a twin-screw extruder, then processed to be fi lm. Raw fi lms were cooled through a series of casting rolls and followed with solid-liquid phase separation, where paraffi n was extracted from the fi lm by dichloromethane. Th e fi lm was then drawn to ideal thickness and tested.Th e preparation process was optimized by Uniform Design, where permeability, tensile strength,puncture intensity and heat shrinkage was considered as key characteristic for the separators.Th e results were analyzed via DPS (Data Processing System) soft ware by quadratic polynomial regression method. Th e simulation result show that ideal experiment condition is the extrusion temperature at 225oc, twin-screw speed at 36rpm, solution concentration at 24% and cooling temperature at 55oc. Verifi cation test was then taken place and the results showed that the air permeability of the separator increased by 53% to 820 s/100ml ,the tensile strength increased by 21% to 173 Mpa,puncture intensity increased by 11% to 515 g/20μm, the heat shrinkage decreased by 57% to 1.2%.

Aliphatic polyesters are commonly applied in bio-medical engineering for drug delivery devices and tissue engineering products because of their biodegradable and biocompatible properties. Unsaturated aliphatic polyesters, such as poly(α-methylene-γ-butyrolactone) (PMBL), are of scientific and technological interest for producing tailor-made functionalized biodegradable shape memory materials due to their exocyclic alkene functionality. Cross-linking in biodegradable polymers,like hydrogels, usually produces shape memory polymers that are sensitive to their environment. Due to unfavourable thermodynamics involved in the ring-opening polymerization (ROP) of MBL, which is from its low strain energy of the fi vemembered lactone ring that brings about too small negative change of enthalpy (ΔH) to off set a large negative entropy change (ΔS) of its ROP, MBL prefers vinyl addition polymerization to ROP. Th erefore, ring-opening homo polymerization of MBL and developing an eff ective cross-linking strategy will provide a gateway into a smart biodegradable polymeric material for shape-memory applications

Sarinthip Thanakkasaranee has completed her Master of Science in Packaging Technology from Kasetsart University, Thailand. During her M.Sc., degree, she has received research grant under “The Thailand Research Fund - Master Research Grants (TRF-MAG) Window I” from Thailand Research Fund in 2011. She also won outstanding Master’s thesis award in the discipline of physical science, and the excellent student award in the Master's degree program from Kasetsart University in 2012. She had worked in the position of Product Development Executive, SML (Thailand) Co., Ltd. and Innovation Designer and Coordinator, Science and Technology Park, Chiang Mai University (CMU STeP). Now, she is doing Ph.D under a guidance of Prof. Jongchul Seo in the Department of Packaging, Yonsei University, South Korea. She also received the Outstanding Foreign Student Scholarship for her Ph.D. program.She has published 2 research papers in peer-reviewed International Journals and also presented her 4 (2 oral, 2 poster) research results in International Conferences

The microwave markets are expected to witness remarkable growth fueled by consumer demands due to the need for the ease of preparation and portability to consume on the go. Th e critical problems of microwave cooking are expansion of internal pressure, explosion of package, and migration of chemical compound from the package into the food product during cooking. Th is issue can be solved by improving the packaging materials and design such as a weak heat seal, shrink-film covered vent valves, and laser scored or perforated fi lm. However, multiple processes are required to produce such packages,which lead to relatively high production cost. In this study, it is proposed to develop polymer/phase change materials (PCM) films with temperature responsive gas permeability as packaging materials as it have the characteristic of self ventilation and applicable to use in microwave oven by preventing the damages and explosion of packaging during the cooking process. A series of poly (ether-block-amide)/polyethylene glycol (PEBAX/PEG) composite fi lms are prepared by solution casting technique. Th e permeation properties, morphologies, thermal properties, and water sorption are interpreted as a function of PEG with diff erent molecular weights. Th e low molecular weight PEGs (PEG 950-1050 and PEG 3350) are well dispersed in the PEBAX matrix, whereas phase separation and surface roughness occurred by adding high molecular weight PEG (PEG 35000) into PEBAX matrix. Th e phase change and gas permeation property of composite fi lms are signifi cantly dependent on the molecular weight of PEGs. Incorporation of low molecular weight PEGs into PEBAX matrix showed a lower oxygen transmission rate (OTR) than pure PEBAX fi lms in the measured temperature ranged from 10°C to a relatively low melting temperatures of each PEGs, which is due to good interaction between PEBAX and PEGs, and an increase in crystallinity of the composite fi lm by introducing PEGs. As the measurement temperature is increased from the melting temperatures of each PEGs to 80°C, the OTR of composite fi lms dramatically increased. Th e composite films exhibited permeation jumps that occur at the melting point of crystallized phase depending on the molecular weight of PEGs. Th e composite film incorporated with high molecular weight PEG exhibited highest permeation jump.

Wei is now pursuing his PhD at the department of applied biology and chemical technology,the Hong Kong Polytechnic University. He is involved in projects related to photocatalysis, semiconductor material and nanotechnology.He has published 5 papers in reputed journals such as J. Phys. Chem.C, Electrochim. Acta, J. Chin. Polym. Sci., Sci. China Chem., Sci. Rep., etc.

Hydrogen energy presents an ideal alternative to fossil fuels in the future because of its high energy capacity, environmental friendliness, and cost-effectiveness. To date, much attention has been devoted to one-dimensional (1D) semiconductor nanomaterials for hydrogen generation due to its stability, catalytic activity and simple fabrication. 1D semiconductor material such as TiO2 nanotube (TNT) shows potential as a solar photocatalyst for hydrogen generation by its large surface area and superior charge transport property. However, some problems such as large band gap (3.3-3.8 eV) and high recombination rate of the photogenerated electron–hole pairs limits the solar application of TiO2. Particularly, TNTs decoration with sensitizer offers an effective way to improve the photocatalytic activity for solar application by extending the photo-response and promoting the separation of photogenerated electron-hole pairs. Recently, using copper sulfide (CuxS) has emerged as an effective sensitizer for improving hydrogen evolution reaction. The copper sulfide family offers a wide spectrum of derivatives and attractive due to their wide absorption band and low reflectance in the visible range, making it a prime candidate for solar energy-harvesting. The CuxS nanodots (NDs) onto the surface of TNTs is elaborately investigated on the morphologies, phase, and optical properties as well as the photocatalytic behavior of the CuxS/TNT. The results demonstrated that the CuxS ND/TNT is an excellent photocatalyst for efficient and stable hydrogen generation from water without noble metal co-catalysts