title: Synthesis of polyacrylonitrile using AGET-ATRP in emulsion.
abstract: The technique of activators generated by electron transfer for atom transfer radical polymerization (AGET-ATRP) of acrylonitrile (AN) has been first attempted in emulsion using the procedure of "one-pot", "two-step" with polyethylene glycol monooleyl ether (Brij 35) as surfactant, cupric chloride (CuCl2) as catalyst, hexamethylenetetramine (HMTA) as ligand, carbon tetrachloride (CCl4) as initiator and ascorbic acid (VC) as reducing agent. The polymerization proceeds in controlled/living manner as indicated by first-order kinetics of the polymerization rate with respect to the monomer concentration, linear increase of the molecular weight of polyacrylonitrile (PAN) with monomer conversion and narrow polydispersity. Monomer conversion increases initially with the increase of ligand HMTA and then decreases. The ratio of [AN1] to [AN2] at 1:3 not only gives better control on the molecular weight and the molecular weight distribution, but also provides a more rapid polymerization rate. The rate of polymerization shows a trend of increase along with CCl4 content. The apparent activation energy of the polymerization is calculated to be 46.6 kJ/mol. Chain extension of PAN with AN was also carried out and the chain extended PAN with 20520 molecular weight and 1.36 polydispersity was successfully obtained.
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, China. Electronic address: lduchenhou@hotmail.com.
authors.forename: Hou
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
authors.forename: Delong
authors.initials: D
authors.lastname: Liu
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
authors.forename: Naiyi
authors.initials: N
authors.lastname: Ji
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
authors.forename: Guangxi
authors.initials: G
authors.lastname: Zong
mesh_terms: D000180:Acrylic Resins / Q000138:chemical synthesis*; D002251:Carbon Tetrachloride / Q000737:chemistry; D002850:Chromatography, Gel; D004583:Electrons; D004655:Emulsions / Q000737:chemistry*; D007700:Kinetics; D008709:Methenamine / Q000737:chemistry; D008970:Molecular Weight; D058105:Polymerization; D013696:Temperature
chemical_list: D000180:Acrylic Resins; D004655:Emulsions; C010504:polyacrylonitrile; D002251:Carbon Tetrachloride; D008709:Methenamine