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       2018年10月19-22日

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Chul B. Park

University of TORONTO

更新时间:2018/7/12 13:33:05

Chul B. Park

       Chul Park is Distinguished Professor of Microcellular Engineered Plastics at University of Toronto. He is also NSERC Senior Industrial Research Chair in Multi-Functional Graphene-Based Polymer Nanocomposites and Foams.He has an international recognition in the polymer foam area. Prof Park has published more than 1000 papers, including over 310 journal papers and four books. Prof Park serves as the Editor-in-Chief of the Journal of Cellular Plastics, and sits on the Advisory Editorial Board of several journals. He has been inducted into 4 academies (the Royal Society of Canada, the Canadian Academy of Engineering, the Korean Academy of Science and Technology, and The National Academy of Engineering of Korea), and a fellow of 5 other professional societies. He has received over 70 awards.

2018年学术年会演讲题目:Nano-Fibril Technology for Superior Properties and Foaming-Ability

       Abstract: This plenary speech will explain the details of the modern foaming technologies that use nanofibrils to control foam processing.

First, the effects of nanofibers on cell nucleation and cell growth will be discussed. Both growing and developed crystals surrounding the nanofibrils can significantly affect the foaming process.  The interface between the crystals and the amorphous sections produces heterogeneous nucleating sites. This is due to the crystals’ expelled gas, the tensile stresses generated by their shrinkage, and the mismatched motion that occurs at the interface.  After the cells have been nucleated, cellular growth is also affected by the crystals.  This is caused by the increased viscosity (especially the extensional viscosity) and the increased melt strength that occurs from the molecules’ connection to the crystals through nanofibrils.

Next, I will also explain the nanofibrils’ effect on the crystallization kinetics of the polymer/nanofibril composites, both with and without gas. The dissolved gas and the nanofibrils dispersed in the polymer matrix acted synergistically on the crystallization behavior of several materials. This was especially true in the case of PLA materials with slow crystallization kinetics. A detailed analysis using a high-pressure DSC showed that the dissolved gas significantly promoted crystal nucleation. But in contrast to this, the crystal growth was reduced because of the increased entanglement of the molecules participating in the crystallization. Consequently, the final crystallinities were often eventually decreased.

Following this, I will show how crystallization is controlled during the bead foaming, extrusion foaming, and foam injection molding processes. I will then show how the growing crystals and the formed crystal structures affect the foaming behaviors in each of these three processes.

The resultant meachanical and barrier properties of the nanofibril composites will also be presented.