Original scientific paper
Synthesis of ethylene-propylene-diene-graft-polystyrene copolymers of various structures
Anita PTIČEK
orcid.org/0000-0001-6243-4638
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Zlata HRNJAK- MURGIĆ
orcid.org/0000-0003-4729-5603
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Jasenka JELENČIĆ
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Mirela LESKOVAC
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Marica MLINAC MIŠAK
Abstract
To study the relationship of different structures on properties, ethylene-propylene-diene-graft-polystyrene (EPDM-g-PS) copolymers, with different graft density were synthesized. For this purpose three different types of EPDM copolymers which differ by concentration of double bonds and propylene were used. The synthesis was carried out at 90 °C in toluene solution using dibenzoyl-peroxide as initiator. Variation of polymerization time was applied to obtain different structures of graft copolymers. Graft copolymers were extracted from mixture of polymers obtained by polymerization. The chain structure of the synthesized graft copolymers was followed by glass transition temperature (Tg), by molecular masses, ( ) and by surface energy. The results of glass transition temperature, of molecular masses and free surface energy show that with extended polymerization time and with various types of main chains of graft copolymers affect the concentration of side branches, which determines the structure and composition of graft copolymer.
Keywords
graft copolymer; EPDM; EPDM-g-PS; PS; structure-properties; synthesis condition
Hrčak ID:
10081
URI
Publication date:
12.3.2007.
Visits: 2.436 *