It was reported in the literatures (19-21) that when the ATRP of polyethylene glycol dimethacrylate (PEGDMA) reached a certain vinyl conversion, the mobility of catalyst/ligand complexes was severely restricted.
In this work, precipitation polymerization was employed to prepare organophosphorous pesticide molecularly imprinted microspheres using monocrotophos (MCP) as template, methacylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinker, azobisisobutyronitrile (AIBN) as initiator and toluene as porogen, respectively.
Examples of the application of these models to systems containing low crosslinker concentrations may be found in the literature for the copolymerization of methyl methacrylate (MMA) with ethylene glycol dimethacrylate (EGDMA) [4, 11], styrene with divinylbenzene [8, 20, 38], and styrene with EGDMA [20].
The reactivity of the pendant vinyl group is approximately one-half of that of the monomeric vinyl group [22], and about 30% of the pendant vinyl groups are consumed in cyclization [23] in the conventional free radical polymerization of methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDMA).
EXPERIMENTAL SECTION Materials Various monomers such as methyl methacrylate (MMA), butyl acrylate (BA), butyl methacrylate (BMA), glycidyl methacrylate (GMA), allyl methacrylate (AMA), ethylene glycol dimethacrylate (EGDMA); sodium lauryl sulfate (SLS) as surfactant: and potassium persulfate (KPS) as initiator were obtained from Sigma-Aldrich Corporation and used without further purification.
