The 7th Iranian Seminar of Organic Chemistry, Department of Chemistry, Faculty of Science, University of Tehran, Tehran, September 12-13, 1999, I.R. Iran

(14 papers were presented)

The 12^th Asian Chemical Congress (12 ACC), Putra World Trade Centre, Kuala Lumpur, Malaysia, August 23-25, 2007.

(3 papers were presented).

IUPAC WORLD POLYMER CONGRESS 2004, 40^th international Symposium on Macromalecules Paris, July 04-09, 2004, France.

(4 papers was presented).

The 2^nd International Conference on Advances in Petrochemichals and Polymers (ICAPP2007), Chulalongkorn University's Petrolleum and Petrochemical College, Chulalongkorn University, Bangkok, Thailand, June 25-28, 2007.

(3 papers were presented).

. The 14th Iranian Chemistry and Chemical Engineering Congress, Department of Chemistry, Faculty of Science, Terbeyet Moallem University, Tehran, February 17-19, 2004, I. R. Iran

(17 papers were presented)

The 13th Iranian Seminar of Organic Chemistry, Bu-Ali Sina University, Hamedan, Sept. 7-9 2006, I.R.Iran

(17 papers were presented).

International Symposium on Environmental Degradation of Materials and Corrosion Control in Metals, 2^nd, Vancouver, BC, Aug. 24-27, 2003 Canada,

(1 papers was presented)

Polycondensation 2006, Koc University, Istanbul, Turkey, Aug. 27-30, 2006, invited lecture

(1 paper was presented).

The 6th Iranian Seminar on Polymer Science and Technology, (ISPST2003) Iran Polymer and Petrochemical Institute, Tehran, May. 12-15, 2003, I.R.Iran.

(4 papers was presented)

The 12th Iranian Seminar of Organic Chemistry, Ahwaz Jundi Shapour University of Medical Sciences, Ahwaz, March. 7-9, 2006, I.R.Iran

(25 papers were presented).