The surfactant was sodium dodecylsulfate (SDS) and the initiators used included potassium persulfate (KPS), 2,2'-azobisisobutyronitrile (AIBN), and benzoyl peroxide (BPO), all supplied from Aldrich and used as received.
When the oil-soluble initiator 2,2'-azobisisobutyronitrile (AIBN) is substituted for KPS, identical results ensue.
2,2'-Azobisisobutyronitrile was recrystallized from chloroform-methanol.
Appropriate amounts of monomers and 1,4-dioxane and 2,2'-azobisisobutyronitrile (1% of the weight of the monomer) were placed in a reaction tube and purged with Nitrogen for 10 min.
It was reported that free radical polymerization of BMI can be initiated by barbituric acid (BTA) (7) or 2,2'-azobisisobutyronitrile
N, N-dimethylformamide (DMF), tetrahydrofuran (THF), hexachlorohexanol, and 2,2'-azobisisobutyronitrile
(AIBN) were purchased from Sinopharm Chemical Reagent Co.
The reagents used in this work include N,N'-bismalei-mide-4,4'-diphenylmethane (BMI, Beil, 95%), N-phenylmaleimide (PMI, Aldrich, 97%), barbituric acid (BTA, Merk, 99%), 2,2'-azobisisobutyronitrile
(AIBN, Acros, 98%), N-methyl-2-pyrrolidinone (NMP, Sigma, 99%), N,N-dimethyl formamide (DMF, TEDIA, 99.
The monomer methyl methacrylate, the initiator 2,2'-azobisisobutyronitrile
(AIBN), and the modified clay were then mixed together using a high shear mixer and reacted to form exfoliated nanocomposites of PMMA/MHABS.
Hexadecane (HD; Acros), 2,2'-azobisisobutyronitrile
(AIBN; Showa), potassium persulfate (KPS; Sigma), sodium dodecyl sulphate (SDS; Acros), polyethylene glycol sorbitan monolaurate (Tween 20; Acros) and cetyltrimethyl ammonium chloride (CTAC; TCI) were used without further purification.
The compound 2,2'-azobisisobutyronitrile
(AIBN) was purified by fractional crystallization from methanol, m.
8]-hexacosane), styrene, and 2,2'-azobisisobutyronitrile