INHIBITION EFFECTS OF RADICAL POLYMERIZATION OF VINYL MONOMERSⅩⅢ.EFFECT OF 1,3,5-TRIPHENYLFORMAZANE INCORPORATED WITH 4-SUBSTITUTED—NITROBENZENE AND 1,3-DINITROBENZENE ON POLYMERIZATION OF METHYL METHACRYLATE

Chinese Journal of Applied Chemistry ›› 1991, Vol. 0 ›› Issue (4): 1-6.

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INHIBITION EFFECTS OF RADICAL POLYMERIZATION OF VINYL MONOMERSⅩⅢ.EFFECT OF 1,3,5-TRIPHENYLFORMAZANE INCORPORATED WITH 4-SUBSTITUTED—NITROBENZENE AND 1,3-DINITROBENZENE ON POLYMERIZATION OF METHYL METHACRYLATE

Zhang Ziyi, Li Zhaolong, Tao Can

Department of Chemistry, Lanzhou University, Lanzhou 730000

Received:1990-04-28 Revised:1990-09-06 Published:1991-08-10 Online:1991-08-10

Abstract

Abstract: The inhibiting effects of 1,3,5-triphenylformazane (TFH) along with 4-substitutednitrobenzene (4SNB) and 4-substituted 1,3-dinitrobenzene (4SDNB)(X = H, CH₃, Cl and Br)as inhibitors in radical polymerization of methyl methacrylate (MMA) have been investigatedby dilatometric method.The induction period (t_i)of polymerization, propagation rate(R_p)of polymerization and the molecular weight (MW) of polymer obtained were examined.Theinhibition efficiency was found to be dependent on the electron nature of the substituentin TFH-4SNB.The electron-withdrawing substituent increased and the electron-donatingsubstituent decreased the t_i respectively.The t_i was found to be dopend ent on the stericeffect of the substitutuent in TFH-4SDNB systems.

Key words: methyl methacrylate, radical polymerization, inhibition, triphenylformazane, substituted nitrobenzene,substituted dinitrobenzene

Zhang Ziyi, Li Zhaolong, Tao Can. INHIBITION EFFECTS OF RADICAL POLYMERIZATION OF VINYL MONOMERSⅩⅢ.EFFECT OF 1,3,5-TRIPHENYLFORMAZANE INCORPORATED WITH 4-SUBSTITUTED—NITROBENZENE AND 1,3-DINITROBENZENE ON POLYMERIZATION OF METHYL METHACRYLATE[J]. Chinese Journal of Applied Chemistry, 1991, 0(4): 1-6.

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INHIBITION EFFECTS OF RADICAL POLYMERIZATION OF VINYL MONOMERSⅩⅢ.EFFECT OF 1,3,5-TRIPHENYLFORMAZANE INCORPORATED WITH 4-SUBSTITUTED—NITROBENZENE AND 1,3-DINITROBENZENE ON POLYMERIZATION OF METHYL METHACRYLATE

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