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MBOCA4,4'-Methylenebis (2-Chloroaniline)
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The monomer 4,4'-methylenebis (cinnamaldehyde) (MBC) and its polythioamides were synthesized as reported method [16-17].
The DuPont Chambers Works in Deepwater, N.J., was a major producer of two carcinogens (beta-naphthylamine and benzidine) and two suspected bladder carcinogens (ortho-toluidine and 4,4'-methylenebis [2-chloroaniline]).
Coagent/modifier Abbreviation Manufacturer Tert.- TBPB Merck KGaA, Darmstadt, Germany Butylperoxybenzoate Triallyl cyanurate TAC Merck KGaA, Darmstadt, Germany Divinylbenzene DVB Merck KGaA, Darmstadt, Germany 4,4'-methylenebis MDI Merck KGaA, Darmstadt, Germany (phenyl isocyanate) Polyethylene glycol PEG 1500 Merck KGaA, Darmstadt, Germany 1500 Polyethylene glycol PEG 4000 Merck KGaA, Darmstadt, Germany 4000 Rapeseed oil -- Brokelmann+co--Oelmuhle GmbH+co, Hamm, Germany TABLE 2.
4,4'-Methylenebis (2-chloroaniline) (MBOCA) is used as a curing agent in industries that primarily produce castable polyurethane parts; thus, occupational exposure may occur during the manufacturing processes in these industries [Agency for Toxic Substances and Disease Registry (ATSDR) 1994].
4,4'-Methylenebis (phenyl isocyanate) and polyester-block-polyether [alpha], [omega]-diol were procured from Fiber Glast Developments.
The reagents used in this study are as follows: 4-4'-oxydianiline (ODA; 97% purity), 4,4'-methylenebis (phenyl isocyanate) (MDI; 98% purity), N-methyl pyrolidinone (99% purity), and iodomethane were purchased from Sigma--Aldrich Company.
Epoxy resin/poly(ethylene oxide) blends were recognized to be miscible when cured with 1,3,5-tridroxybenzene (THB) [2], 4,4'-diaminodiphe-nylmethane (DDM) [8], 4,4'-methylenebis (3-chloro-2,6-diethylaniline) (MCDEA) [9], and phthalate anhydride (PA) [10].
In our work, we intend to make epoxy thermosets from two diamines 4,4'-methylenebis 3-chloro 2,6-diethylaniline (MCDEA), 4,4'-diaminodiphenylsulfone (DDS) exhibiting nearly the same flexibility (i.e., the same [T.sub.g]) but very different reactivities.