1:30 pm – 5:00 pm:
TH12-Composites: Nanocomposites- Room S320F
1:30 pm – 2:00 pm:
Synthesis, Characterization and Water Application of Microcellular Injection Molded PPgMA/MMT Nanocomposites
Shyh-Shin Hwang, Professor, Chien-hsin University of Science and Technology
This study investigated the effects of MMT (0.5, 1, 3 wt%) loading on thermo-mechanical, adsorption properties of microcellular injection molded PPgMA nanocomposites. The injection molding process was done by non-foam and microcellular molding. Results showed that the dispersion from TEM pictures, some of MMT are intercalated and some of them are exfoliated structures. This 0.5 wt % loading of MMT had the best tensile strength for solid molding while it is 1.0 wt% loading for microcellular molding on PPgMA material. This is the results of MA grafted PP. Tensile strength is related to the filler dispersion in the matrix. Good dispersion resulted in good tensile strength. It had the highest storage modulus for 0.5 wt% MMT loading PPgMA/MMT nanocomposites from the DMA test results. TGA results showed that thermal degradation can be increased with addition of MMT into matrix. SEM morphology showed that with addition of MMT, cell size decreased and cell density increased. Heavy metal adsorption test showed that MMT can adsorb Pb(II) more efficient than that of neat PPgMA.
2:00 pm – 2:30 pm:
Preparation of Polypropylene Single-polymer Composites With Graphine Nanoplatelets by Film-stacking
Mingwang Shao, Beijing Institute of Technology
Polypropylene single-polymer composites (PP SPCs) are the materials where both the reinforcing phase and the matrix phase are PP. Graphene nanoplatelets (GNPs) have good mechanical properties because of its unique structure. In this study, GNPs were used as one kind of nanofiller to add in PP SPCs to improve its thermal properties and tensile properties. The PP-GNPs SPCs were prepared by film-stacking method. Differential scanning calorimeter experiments (DSC) were executed to determine the hot pressing temperature and investigate the thermal properties. Influences of the GNPs content on the tensile properties of PP SPCs were studied through the tensile tests. The results show that the melting peak temperature and tensile properties increase with the increase of GNPs content.
2:30 pm – 3:00 pm:
Isolating the Effect of Polymere-filler Interaction on Polymer Composite Property Enhancement: The Example of Polypropylene/halloysite Hybrids
Tong Wei, Northwestern University
We prepare polypropylene (PP) composites with both pristine halloysite nanotubes (p-HNT) and PP grafted halloysite nanotubes (PP-g-HNT) using two processing techniques, solid-state shear pulverization (SSSP) and melt mixing. We address the role of isolated polymer-filler interaction effects on polymer nanocomposite property enhancement at similar, high levels of filler dispersion. As demonstrated by microscopy and rheology, nanocomposites prepared by SSSP with different fillers have very similar, well-dispersed states, eliminating differences in dispersion as a factor in property enhancements. The well-dispersed PP/PP-g-HNT nanocomposites exhibit a broad range of properties that are superior to those of PP/p-HNT, including tensile strength, PP non-isothermal crystallization onset temperature, and isothermal PP crystallization half-time. However, the Young’s modulus is the same regardless of filler modification. Only superior filler dispersion contributes to Young’s modulus enhancement in nanocomposites.
3:00 pm – 3:30 pm:
Numerical and Experimental Studies on Flow and Warpage During Resin Transfer Molding Process
Sejin Han, Autodesk
In this paper, the numerical and experimental studies of flow and warpage of thermoset materials in a resin transfer molding (RTM) process are described. We give introduction to the theory and methods of simulation for the flow and warpage analysis. Further, two example cases are shown. One is a case where the flow during RTM process is studied. Another is the case where the warpage analysis is performed. The simulation results in this study are in good agreement with experimental results.
3:30 pm – 4:00 pm:
High Fracture Resistance, Filler Adhesion and Dispersion in Epoxy Carbon Nanofiber Composites
Muhammad Anwer, University of Toronto
This study evaluates the morphological, fracture and mechanical characteristics of composites of epoxy with carbon nanofibers (CNFs). These composites were prepared via modified solvent exchange process resulting in significant filler dispersion and matrix filler adhesion as evidenced from the SEM micrographs. Composites with 0.1, .5, and 1t% fillers were evaluated. The crack resistance, KIC of these composites with just 1wt% CNF is more than 2 times that of neat epoxy. The tensile strength and modulus of the epoxy CNF composites show more moderate changes with increase in the CNF content.
4:00 pm – 4:30 pm:
Developing Ultrasonic Processing of CNT Nanopaper/solventless Epoxy Prepreg
Dan Zhang, The Ohio State University
In this work, we propose an environmentally friendly innovative ultrasonic process to impregnate solventless epoxy into carbon nanotube (CNT) nanopaper (NP) (approximately 50 um thick) for fabricating prepreg nanocomposites. Both multi-wall carbon nanotube (MWNT) NP and single-wall carbon nanotube (SWNT) NP are used for prepreg fabrication. The prepregs show multi-functional performance in EMI shielding and sand erosion resistance. Process parameters including ultrasound time, amplitude level and pressure are studied for the fabrication process.
4:30 pm – 5:00 pm:
In Situ Vitamin C Reduction of Graphene Oxide for Preparing Flexible TPU Nanocomposites With High Dielectric Permittivity
Han-xiong Huang, South China University of Technology
Flexible thermoplastic polyurethane/reduced graphene oxide (TPU/rGO) nanocomposite sheets are prepared via in situ vitamin C reduction. X-ray photoelectron spectroscopy spectra suggest a successful reduction of the GO by vitamin C, which can enhance the interfacial polarization ability of the resultant rGO layers. X-ray diffraction patterns and transmission electron microscopy image indicate a well exfoliation of the rGO layers in the TPU matrix. This results in the formation of a rheological percolation structure in the nanocomposite with 0.75 vol% rGO, as suggested by the rheological properties. The enhanced interfacial polarization ability and the formed percolation structure of the rGO layers in the TPU matrix allow for constructing a large network of micro-capacitors. Thus high dielectric permittivity (ε′ = 151 at 1 kHz) is obtained for the nanocomposite sample with only 0.75 vol% rGO.