Biography: Dr Zongjin LI is Chair professor of Institute
of Applied Physics and Materials Engineering at University of
Macau (UM). He joined UM after his service at The Hong Kong
University of Science and Technology from 1994 to 2016. He
received his B.E. from Zhejiang University, Hangzhou, China in
1982 and obtained both his M.S. and PhD from Northwestern
University, Chicago, U.S.A, in 1990 in 1993, respectively. He is
a fellow of American Concrete Institute and a registered
professional engineer in Hong Kong, China. He is a member of
committees of ISO/TC71, First vice Chair of China Group of RILEM
and Founding President of ACI China Chapter.
He has done extensive researches in the area of cement-based materials and non-destructive evaluations. As the chief scientist, he has led a China Key National Basic Research Project (973), ‘Basic study on environmentally friendly contemporary concrete’, which has made a great contributions to advance concrete technology in China. As the founding chair of Gordon Research Conference, ‘‘Advanced Materials for Sustainable Infrastructure Development’ in 2014, he has brought the research conference of building materials into a higher scientific level.
He has published 5 technical books, in which ‘Advanced Concrete Technology’ published by John Wiley has been collected by many national libraries and most major university libraries and used by many universities as text or reference books for civil engineering. He has also published more than 400 technical papers with a SCI H-index of 39 and Scopus H-index of 43. In 2016, he has been selected as the one of the 150 most cited authors in Civil engineering field. He has also been awarded five US and seven Chinese patents. Three of his patents have been developed into commercial products.
He received the Arthur R. Anderson Medal from American Concrete Institute in 2017 and Distinguished Visiting Fellowship Award from British Royal Academy of Engineering in 2014.
Abstract: Recently, it becomes popular to achieve enhanced mechanical properties of cement-based materials through incorporation of nano particles. In this presentation, advanced cement-based materials through application of nanotechnology will be introduced. One example is to use cement to generate 5 nm nanoparticles which is utilized to enhance the mechanical properties of hydrogel. By adding 5-nm inorganic particles in organic matrix, hydrogels with the best all-round performance in the world has been successfully developed in aspects of strength, elastic recovery and ultimate stretch ratio. Also, by adding organic or inorganic nano particles into cement based materials, the flexural strength of the cement-based materials increased significantly. For cement paste, bending strength is increased by three times without lowing the compressive strength. Moreover, with newly developed inorganic-organic integrated nano particles, the hydration heat of cement-based materials can be reduced and their toughness will be improved without degrade their compressive properties. Finally, the high modulus concrete developed through the addition of nano particles will be introduced on its optimization in materials formulation, dimension stability behavior and structural performance.
Biography: Professor Ildoo Chung joined the faculty of Department of Polymer Science and Engineering at Pusan National University, Korea in 2005. Prior to that, he completed his postdoctoral training with Professor Jimmy Mays in Department of Chemistry at University of Tennessee, and with Professor Dong Xie in Department of Biomedical Engineering at University of Alabama at Birmingham, USA. He received his Ph. D. at Pusan National University in 2000. He is now serving editor-in-chief of Journal of Adhesion and Interface, and member of board of directors in the Polymer Society of Korea, the Korea Society of Adhesion and Interface, Korea Polyurethane Society, and Asian Cyclodextrin Conference. He had over 70 peer-reviewed publications and over 150 presentations in national and international conferences. His research interests are focused on polymer synthesis such as atom transfer radical polymerization (ATRP), radical addition-fragmentation transfer (RAFT) polymerization and advanced polymeric biomaterials such as drug delivery system, hard/soft tissue compatible polymers, photocurable 3D printing polymer, biodegradable polymer and composite system.
Abstract: Porous biodegradable microspheres were fabricated by
successful RAFT polymerization of methyl vinyl ketone onto
polycaprolactone and polylactide followed by an oil/water
emulsion-evaporation method, then finally photodegradation of
PMVK blocks by UV irradiation. Macro-CTA (chain transfer agent)
was synthesized by reacting carboxylic acid terminated CTA,
S-1-dodecyl-S’-(a,a’-dimethyl-a’’-acetic acid) trithiocarbonate
(DDMAT) with hydroxyl terminated polycaprolactone, which was
then used for the synthesis of triblock copolymer with methyl
vinyl ketone (MVK). The synthesized triblock copolymers were
characterized by FT-IR, 1H NMR spectroscopies. Gel permeation
chromatography (GPC) was used to evaluate the molecular weight
and molecular weight distribution and monitored the
photodegradability of the block copolymers. The morphology of
microspheres was spherical with smooth surfaces before UV
irradiation. However, those from PCL-PMVK triblock copolymers
had rough surfaces and porous structures after UV irradiation
due to the photodegradation of PMVK blocks as a porous template.
The porosity and shape of the microspheres and shape of
microspheres were dependent on the PMVK contents and size of