Molecular imprinted polymer (MIP)
with methacrylate acid (MAA) as monomer and ethylene glycol dimethacrylate
(EGDMA) as cross-linker in different molar ratios has been prepared.
The free volume size and distribution have been derived from the measured
positron lifetime spectra in MIP. The free volume size distribution
observed clearly indicates the influence of the amount of cross-linker
in the sample. Present results suggest that the optimum monomer cross-linker
ratio is 1:5 for this MIP. Fourier tranform infrared (FTIR) results
confirm complete extraction of the 4-chlorophenol template molecules
(4-CP) from the MIP with the absence of stretching frequencies at
648 and 825 cm–1 for the C–Cl group. The
free volume distribution analysis indicates that the percentage of
accessible cavities to 4-CP molecules in this MIP is only 85% and
less than those values reported in earlier studies.
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