EFFECT OF POLYBUTADIENE COMPOSITION ON THE GLASS TRANSITION TEMPERATURE OF SBS BLOCK COPOLYMERS

Authors : Serhat GÜNDÜZ, Yavuz SAR, Kaan ÇAKTI

Pages : 45-54

Doi:10.18038/estubtda.812660

View : 12 | Download : 9

Publication Date : 2021-03-26

Article Type : Research Paper

Abstract :Gel permeation chromatography insert ignore into journalissuearticles values(GPC);, nuclear magnetic resonance insert ignore into journalissuearticles values(NMR); spectroscopy, and elemental analysis techniques were used to study the molecular characteristics of six commercially available styrene-butadiene-styrene insert ignore into journalissuearticles values(SBS); block copolymers which are mostly used for modifying bitumen. The cis-1,4, trans-1,4, and 1,2-vinyl units in the polybutadiene insert ignore into journalissuearticles values(PB); parts and the styrene contents of the SBS block copolymers were investigated by means of 1H-NMR spectra. In addition carbon and hydrogen contents were estimated using 1H-NMR measurements. These estimated values were confirmed using the results of elemental analysis insert ignore into journalissuearticles values(EA);. The glass transition temperatures insert ignore into journalissuearticles values(Tg); of SBS block copolymers were obtained using differential scanning calorimetry insert ignore into journalissuearticles values(DSC);. The SBS block copolymers used in this study have different structural properties such as molecular weight and linearity. However, it is observed that the Tg-onset values are directly proportional to the percentage of the 1,2-vinyl units and inversely proportional to the percentage of the trans-1,4 units in the SBS block copolymers.
Keywords : SBS, Block copolymers, GPC, NMR, Glass trantision temperature