Naslov
Characterization of modified graft copolmyers

Autori
Ptiček, Anita ; Hrnjak-Murgić, Zlata ; Jelenčić, Jasenka ; Kovačić, Tonka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
International Conference MATRIB 2004 : Abstract book / Grilec, Krešimir - Zagreb : Hrvatsko društvo za materijale i tribologiju (HDMT), 2004, 238-243

Skup
International Conference MATRIB 2004

Mjesto i datum
Vela Luka, Hrvatska, 23.07.2004. - 25.07.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
in situ polymerization; graft copolymers

Sažetak
Modification of polymers by graft copolymerization has afforded a great number of new materials with unique properties. Graft copolymers usually are used as compatibilisers when two different polymers are mixed. Compatibilizer in polymer blends reduces the interfacial tension of two immiscible polymers and increases the adhesion between their phases. In this study three different types of graft copolymers were synthesized: ethylene-propylene-diene-graft-isocyanate (EPDM-g-HH) containing monomer HH formed of 2-hydroxyethyl methacrylate-isophorone diisocyanate, polyethylene-graft-polystyrene (PE-g-PS) and polyethylene-graft- isocynate-containing monomer HH (PE-g-HH). In situ polymerization of two monomers (styrene and HH) onto EPDM and PE was carried out in toluene solution using dibenzoyl-peroxide as initiator at temperature of 900C. Graft copolymers were synthesized for different period of time and influence of chemical structure of polymer chains on final properties was studied. Synthesized graft copolymers were characterized by melt flow rate (MFR), by differential scanning calorimetry (DSC), by intrinsic viscosity and by FTIR-spectrophotometer. From results it is obvious that conditions of graft copolymerization has significant effect on chemical structure of graft copolymers. The properties of the grafted polymer are often in stark contrast to the properties of the original polymer because the length and the density of the branches make significant contribution. It is noticed that higher concentration of branches increase the intrinsic viscosity and melt flow rate, while polystyrene branches increase the crystalinity.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA