2^nd International Conference and Expo on Diamond, Graphite & Carbon Materials April 16-17, 2018 London ,UK

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 Institue 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.The UHMWPE resin was dissolved by LP under heat and shear of a twin-screw extruder, then processed to be film. Raw films were cooled through a series of casting rolls and followed with solid-liquid phase separation, where paraffin was extracted from the film by dichloromethane. The film was then drawn to ideal thickness and tested.The preparation process was optimized by Uniform Design, where permeability, tensile strength, puncture intensity and heat shrinkage was considered as key characteristic for the separators.The results were analyzed via DPS (Data Processing System) software by quadratic polynomial regression method. The simulation result show that ideal experiment condition is the extrusion temperature at 225℃, twin-screw speed at 36rpm, solution concentration at 24% and cooling temperature at 55℃. Verification 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 five-membered lactone ring that brings about too small negative change of enthalpy (ΔH) to offset a large negative entropy change (ΔS) of its ROP, MBL prefers vinyl addition polymerization to ROP. Therefore, ring-opening homo polymerization of MBL and developing an effective cross-linking strategy will provide a gateway into a smart biodegradable polymeric material for shape-memory applications.

Airborne and waterborne diseases, caused by the inhalation, ingestion or absorption of pathogenic microorganisms, pose a serious threat to human health. Functionalization of polymeric fibres with antimicrobial agents is an attractive strategy to overcome these concerns. Graphene and graphene oxide have presented themselves as promising materials for the inhibition of bacterial colonization. Here we fabricated a novel class of ultra-thin polymeric fibres loaded with either 2, 4, or 8 wt% of graphene or graphene oxide nanoparticles using pressurized gyration. Electron Microscopy was used to characterize graphene and graphene oxide nanoparticles, as well as fibre morphology. Scanning Electron Microscopy revealed the formation of beaded porous fibres. The concentration of carbon nanoparticles in the composite was found to dictate fibre morphology. As the concentration increased, the average fibre diameter increased, whilst fibre porosity decreased. The antimicrobial activity of these nanocomposite fibres was assessed against both Gram-negative and Gram-positive bacteria. Pure polymer fibres were used as the negative control. The fibres were incubated in bacterial suspensions for 24 hours at 37oC; bacterial colony forming units were enumerated by adopting the colony counting method. The presence of 2 and 4 wt% graphene loaded fibres promoted microbial growth, whilst 8 wt% graphene loaded fibres showed antimicrobial activity. 2, 4 and 8 wt% graphene oxide loaded fibres exhibited excellent antibacterial activities with bacterial reductions of 45%, 70% and 85%, respectively. The results presented in this research have identified a novel application of carbon based hybrid materials.

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. The 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. This 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 film. 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 films are prepared by solution casting technique. The permeation properties, morphologies, thermal properties, and water sorption are interpreted as a function of PEG with different molecular weights. The 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. The phase change and gas permeation property of composite films are significantly 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 films 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 film by introducing PEGs. As the measurement temperature is increased from the melting temperatures of each PEGs to 80 °C, the OTR of composite films dramatically increased. The composite films exhibited permeation jumps that occur at the melting point of crystallized phase depending on the molecular weight of PEGs. The composite film incorporated with high molecular weight PEG exhibited highest permeation jump.