High oil-absorptive composites based on 4-tert-butylstyrene-EPDM-divinylbenzene graft polymer

摘要

4-tert-Butylstyrene-EPMD-divinylbenzene grafte polymer (PBED) was prepared by graft crosslinking polymerization in toluene using BPO as an initiator. Gel and sol of PBED were isolated by extraction with tetrahydrofuran (THF). Sol PBED can be resulsed as oil absorbent through crosslinking by ultraviolet irradiation. After swelling in oil, crosslinked polymers have poor gel strength to be taken out of oil wholly at high absorbency, although they possess strong mechanical strength in their dry states. As known, composite technique is one of the useful methods for material reinformcement. Fibres, sponges and non-woven fabrics were used as reinformcers or supporters in this work. Oil absorbency was measured by method ASTM (F726-81) and swelling kinetics of the composite was evaluated by an experimental equation. The gel strength parameter S, the relaxation exponent n, and the fractal dimension d_f of polymer and some composites in pseudo-critical gel state were determined from oscillatory shear measurements by a dynamic rheometer. Mechanical properties and the morphologies of some composites were measured with a tensile tester and scanning electron microscopy, respectively.