Modification of polyethylene with itaconic acid
Polimery 2003, No 10, 684
Itaconic acid (KI) grafting onto PE-LD in the presence of dicumyl peroxide (DCP) was done with the aim to make the product more hydrophilic what should facilitate the polymer waste decomposition in the environment. The two-step process was realized in the single screw extruder and various concentrations of KI (3—10 wt. %) and DCP (up to 1.1 wt. %) were used. The products of KI thermal decomposition were identified using Py/GC/MS method (Figs. 2 and 3). FT-IR analysis excluded their presence in the grafted compositions while suggested KI grafting (Figs. 4 and 5). It was found, using aqueous extraction method, that the higher KI and DCP concentrations the higher grafting degree (Table 1). However, in the compositions containing >3 wt. % of KI, polymer crosslinking did not occur (Table 3) at the whole range of DCP concentration. The effects of KI and DCP concentrations in the compositions on their tensile properties were characterized.
Keywords: polyethylene, radical grafting, itaconic acid, reactiye extrusion, crossiinking, mechanical properties