Abstract
Relationships between the catalytic activity of 4-vinylpyridine (4VP)-grafted low-density polyethylene film and the photografting conditions [such as polymerization system (vapour- and liquid-phase processes), monomer concentration, polymerization temperature and film thickness] were investigated. Hydrolysis of p-nitrophenylacetate with the 4VP-grafted sample was carried out at 40° in water/ethanol ( 1 4 v/v ) at pH 6.3. Higher catalytic activity was observed for the 4VP-grafted samples prepared by using the liquid-phase process, a lower monomer concentration, lower polymerization temperature and a film thickness of 70 μm. It is supposed that the 4VP-grafted chains are situated on the film surface, resulting in the higher activity.
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