3^rd International Conference on Polymer Science and Engineering(10 Plenary Forums-1Event) October 2-3 2017 Chicago, USA

Denys Savchenko is a passionate chemical researcher. He studies development of materials for grinding tools. In 2014 he got PhD in Material Sciences. His research is dedicated to the study of the polymer structure and improvement of heat-resistance and mechanical properties of materials based on polymers.

Montmorrilonite is one of the fillers for polymers that are studied now. It attracts scientists due to the following reasons: 1) improvement of polymeric materials properties due to filler introducing 2) particularities of montmorrilonite behavior in polymer melts and solutions 3) abundance and availability of the mineral Introduction of montmorrilonite into polymers and olygomers may improve their mechanical properties, heat-resistance, gas selectivity (for membranes), compatibility of polymers, and accelerate relaxation process and reduce water absorption. Polymeric composite materials based on montmorrilonite can be applied for electrochemical sensors, drug delivery systems, packaging materials, sorbents, etc. However there are no literature data about application of such polymeric composite materials as binders for grinding tools. In addition, there is no enough information about structure peculiarities of olygomers based on phenol-formaldehyde, containing montmorrilonite. Objectives of this work were: 1) to make the synthesis of olygomers based on phenol-formaldehyde and montmorrilonite, 2) to study olygomer structures and the influence of concentration of montmorrilonite and alkali on them, 3) to provide a substantiate preposition about a chemical reaction mechanism of olygomer formation. Experimental part: the synthesis of olygomers was conducted in seven steps: 1) the water was added to montmorrilonite, 2) phenol-formaldehyde was dissolved in alkaline medium and a catalyst was added to it, 3) both mixtures were heated and stirred during 30 days, 4) montmorrilonite sorbed the water was added in portions to the phenol-formaldehyde solution 5) the obtained system was heated and stirred as well 6) during heating and stirring the residue of olygomer has formed 7) olygomer was filtered and dried. The structure of olygomer was studied with IR-spectra. Findings: Olygomers based on phenol-formaldehyde, containing silica-alumina layers of montmorrilonite were synthesized. Synthesized olygomers were of three structure types: 1) aromatic rings of phenol-formaldehyde are coordinated around silica atoms of silica-alumina layers 2) metoxyl and hydroxyl groups are coordinated around silica-oxide groups of above mentioned layers 3) phenol-formaldehyde chains are chemically bound with such layers via Si-O-C bonds.

Myoungsu Shin holds a B.S. (1994) and M.S. (1998) from Seoul National University and a Ph.D. (2004) from the University of Illinois at Urbana-Champaign. He has been on the faculty of the School of Urban and Environmental Engineering at UNIST since March 2010. Dr. Shin was previously an Assistant Professor at Morehead State University in Kentucky from 2004 to 2006. He is a licensed Professional Engineer in the U.S. with about four years of practical engineering experience at Rosenwasser Grossman Consulting Engineers in New York, NY. Prof. Shin is a member of many national and international, technical and administrative committees, including ACI-ASCE Committees 352 (Joints and Connections), 421 (R/C Slabs), and ACI Committee 374 (Performance-Based Seismic Design). His primary research interests include seismic design, modeling, and assessment of civil infrastructures, design optimization of tall buildings, high performance sustainable materials (e.g. fiber-reinforced, self-healing, sulfur composites), and non-destructive evaluation technologies.

This study investigated the age-dependent strength and ductility characteristics of calcium sulfoaluminate (CSA) cement systems modified by an acrylic redispersible polymer powder. The effects of the polymer on the compressive strength and microstructure were examined from an early age of 2 h to 90 days. The macro- and microstructural characteristics of the hardened mortars and cement pastes were characterized by compressive strength tests, mercury intrusion porosimetry (MIP), powder X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The test results suggested that a higher dose of polymer powder not only delayed setting, hydration, and strength development, but also refined the pore structure of the cement systems suitable for achieving superior ductility. We believe that our study makes a significant contribution to the literature because it contributes to reducing the energy consumption and associated CO2 emission from cement production, specifically by providing information that can be used to enhance the mechanical characteristics of CSA cement systems.