Naslov
Synthesis of modified graft copolymers and its influence on properties

Autori
Ptiček, Anita ; Hrnjak-Murgić, Zlata ; Jelenčić, Jasenka ; Kratofil, Ljerka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program and book of abstracts, POLYCHAR-12, 12th Annual Polychar World Forum on Advanced Materials / Brostow, Witold - Guimaraes : Vila Nova de Gaia, 2004, 106-106

Skup
12th Annual Polychar World Forum on Advanced Materials

Mjesto i datum
Guimarães, Portugal, 06.01.2004. - 09.01.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
graft copolymers; polymer blends; in situ polymerization; physical properties

Sažetak
When two or more polymers are mixed, the phase structure of the resulting material can be miscible, partially miscible or immiscible. Polymer blends are usually thermodynamically immiscible and, when blended, usually display poor properties, owing to their unstable morphology and poor adhesion between the phases. The phase morphology of immiscible polymer blends can be controlled by addition or in situ formation of compatibilisers (block or graft copolymers) which act as interfacial agents. In situ formed copolymers act as compatibilisers by reducing the interfacial tension and increasing the adhesion between the phases, and thereby allowing a finer dispersion and a more stable morphology. In this study two different types of graft copolymers were synthesized: ethylene-propylene-diene-graft-polystyrene (EPDM-g-PS) and ethylene-propylene-diene-graft-isocyanate (EPDM-g-HH) containing monomer HH formed of 2-hydroxyethyl methacrylate-isophorone diisocyanate. In situ polymerization of two monomers (styrene and HH) onto EPDM was carried out in toluene solution using dibenzoyl-peroxide as the initiator at temperature of 900C with continuous stirring in inert atmosphere. Graft copolymers were synthesized for different period of time (1, 3, 5, 7 and 9 hours) to study the influence of length of branched chain on chemical structure. Another series of samples on different type of EPDM was carried out with TAC (threealylcyanurate) to prevent grafting of styrene and HH monomer on EPDM chain during polymerization to modify the density of side chains. The graft copolymers were characterized by melt flow rate (MFR), by gel permeation chromatography (GPC), by intrinsic viscosity and by IR-spectrophotometer. It is observed from the results that the various chemical structure of graft copolymers have significantly effect on physical properties.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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