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5723554 
Journal Article 
Spectral and thermal characterization of styrene-butadiene copolymers with different architectures 
Munteanu, SB; Vasile, C 
2005 
Yes 
Journal of Optoelectronics and Advanced Materials
ISSN: 1454-4164 
National Institute of Optoelectronics 
7 
6 
3135-3148 
English 
WOS:000234027300053 
Three types of styrene-butadiene copolymers ? two block copolymers (poly(styrene-b-butadiene-i-styrene) linear triblock copolymer, poly(butadiene-b-styrene)4 star block copolymer) and a poly(butadiene-co-styrene) random copolymer have been investigated by Fourier transform infrared (FT-IR) spectrometry, nuclear magnetic resonance ( 13C NMR) spectrometry, dynamical mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) in order to find correlations between their macromolecular structures and physical properties. The main spectral (FT-IR and 13C NMR features which discriminate between block and random copolymers have been established. A band at 1702 cm-1 was found to be typical for the random copolymer, while the extinction coefficients of some bands (699 cm-1(PS), 966 cm-1 (trans PB), 2848 cm-1 (PB) and 2920 cm-1 (PB) cm-1) are different for star copolymer in comparison with the corresponding linear block copolymer. The relations for composition determination from 13C NMR data for each type of copolymer were established. DSC and DMTA analyses were used to compare the degrees of mixing at the interface in the block copolymers and to examinate the supermolecular structure of the block copolymers. The domain disruption temperature (TDD) has been detected. 
elastomers; thermal properties; domain structure; thermomechanical effect