The 9 th International Conference for Basic Sciences
27 – 29 March, 2017, Cairo, Egypt.
The Conference will be held in Al-Azhar Conference Center (aacc), Tayaran st., Nasr City, Cairo
Energy, Environment and Sustainable Development
Basic Sciences pillar for the transition to the era of knowledge
العلوم الأساسية ركيزة ضرورية للتحول إلى عصر المعرفة

The 9 th International Conference for Basic Sciences,
   
Energy, Environment and Sustainable Delvelopment, 27 – 29 March 2017, Cairo, Egypt.

Plenary (POL) Speaker

MINIEMULSIONS & THEIR POLYEMER LATEX SYSTEMS -
Invention, fundamental understanding and applications

Mohamed S. El-Aasser
Vice President for International Affairs
Department of Chemical & Biomlecular Engineering
Emulsion Polymers Institute
Lehigh University Bethlehem, PA 18017, USA
 

Abstract

The concept behind of miniemulsion was conceived, and proven, at Lehigh University in 1972. Research was conducted at Lehigh and elsewhere over the past 45 years which resulted in developing not only a fundamental understanding of miniemulsion systems based on solid scientific data but also new applications of polymer colloids and latex systems. However, the term “miniemulsion” was coined only in 1981. Following the a period of almost 20 years with only few publications in the open literatures, the annual number of publications on miniemulsions has been increasing exponentially over the past two decades including 240 patents currently.
Miniemulsions are relatively stable oil-in-water emulsions with average droplet diameters ranging from 50 to 500 nm. These are typically prepared using a mixture of a surfactant and a low-molecular weight, highly water-insoluble co-stabilizer (early on referred to as co-surfactant). The lack of water solubility of the co-stabilizer is responsible for retarding emulsion degradation due to the Ostwald ripening, and hence the longer shelf-life stability of the submicron droplets. The low molecular weight of the co-stabilizer is responsible for its swelling promoting capability due to favorable entropic interactions according to Flory-Huggins-Morton equation. The two most important features of miniemulsions that distinguish them from conventional emulsions are the ability to prepare stable submicron oil-in-water droplets and the high swelling capabilities of the droplets. Another important feature is that in miniemulsion polymerization, the submicron size monomer droplets are the main sites for particle nucleation and growth via free radical initiation using oil-soluble or water-soluble initiators. These unique features of miniemulsions have been exploited in making new types of polymer colloids (latexes) that were difficult and sometimes impossible to make by using conventional emulsification or emulsion polymerization processes. These include preparation of artificial latexes and hybrid latexes, high solids latexes, polymerization of hydrophobic monomers and macromonomers, controlled polymer microstructure and morphology, encapsulation of inorganic nano-particles and organic pigments and dyes, and controlled molecular weight via living free radical polymerization, (see graph below).
A review of state-of-the-art of miniemulsion over the past 45 years will be given emphasizing the fundamentals, recent developments and applications.



Al-Azhar 9th International Conference, 27-29 March, 2017, Cairo, Egypt

 

 

Biographical Sketch

 

Mohamed El-Aasser, professor of chemical engineering at Lehigh University. He served the University as vice president for international affairs (2009-2015) provost and vice president for academic affairs (2004-2009), dean of the P.C. Rossin College of engineering and applied science (2001 – 2004), chairman of chemical engineering department (1996 – 2001), co-director of the emulsion polymers Institute (1978 – 1989) director of the emulsion polymers institute (1989 – 2009), director of the enter of polymer science and engineering, director of the NSF polymer interfaces center (1991 -1996).  

 

He earned BS and MS degrees from Alexandria University, Egypt and PhD from McGill University, Canada. He is internationally known for his research on polymer colloids: emulsion polymerization processes & latex technology, latex particle morphology, latex film formation, surfactants and colloidal stability. He and his students pioneered the field of miniemulsions. Authored more than 400 scientific articles, edited 5 books and holds 9 U.S patents. Advised 65 PhD students and Co-advised 32 PhD students, 53 MS students and 31 postdoctoral fellows. Delivered numerous lectures at national international conferences. El-Aasser received a bachelor’s and a master’s degrees from Alexandria University, Egypt, and a Ph.D. from McGill University, Montreal, Canada. He has received numerous awards, including the 2007 Fellow of the American Chemical Society’s Division of Polymeric Materials Science and Engineering, Lehigh University’s 1999 Hillman Extraordinary Service Award, the 1985 NASA Inventor of the Year Award (shared), the 2002 Roy W. Tess Award in Coatings and the 2007 Fellow of Division of Polymeric Materials Science and Engineering; both of the American Chemical Society. January 17, 2017
 

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