Naslov
Change of Molecular Weight Distribution of Statistical Poly(styrene-co-acrylonitriles) with Composition

Autori
Rogošić, Marko ; Mencer, Helena Jasna ; Gomzi, Zoran

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

Izvornik
Abstracts of papers: 9th International Symposium "Advances and Applications of Chromatography in Industry" / Kaniansky, D. - Bratislava, 1993

Skup
9th International Symposium "Advances and Applications of Chromatography in Industry"

Mjesto i datum
Bratislava, Slovačka, 29.08.1993. - 03.09.1993

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Molecular weight distributions; Statistical copolymers; Styrene; Acrylonitrile

Sažetak
Statistical poly(styrene-co-acrylonitriles), (SAN) copolymers with varying mole fractions of comonomers (9.1-0.9) have been synthesized. Copolymerization was carried out by radical polymerization in solution in batch usothermal reactor with AIBN as initiatior up to 12% conversions. Molecular weight distributions have been determined by gel permeation chromatography, and parameters of molecular weight distributions have been calculated by fitting the experimental results to the most widely applied models of polymer molecular weight distribution functions. Changes in molecular weight distribution parameters which indicate mmolecular weight interval and polydispersity of synthesized samples are related to the initial feed mole fractions of comonomers and composition of copolymers. Results indicate constant polydispersity and a shift of molecular weight distribution curves toward higher molecular weight range with an increasing percentage of polyycrylonitrile component in copolymer. This correlation may be the kinetic indicator, important for macromolecular engineering. However, the shift of gel permeation chromatography curves could be caused also by preferential interactions among the main components in the column as well as by the change of the hydrodynamic volume of the polymer sample of the same molecular weight with the composition. A detailed study is in progress.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA