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SPECTRAL AND THERMAL CHARACTERIZATION OF STYRENE BUTADIENE COPOLYMERS WITH DIFFERENT ARCHITECTURES

S. B. Munteanu1,* , C. Vasile2

Affiliation

  1. “P. Poni” Institute of Macromolecular Chemistry 41 A Grigore Ghica Vod Alley RO 700487 Ia i Romania
  2. “Al.I.Cuza" University, Ia i; Physics Faculty, Department of Plasma Physics, Optics and Material Structure; Bd. Carol I, No.11, Romania

Abstract

Three types of styrene-butadiene copolymers ? two block copolymers (poly(styrene-b butadiene-b-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..

Keywords

Elastomers, Thermal properties, Domain structure, Thermomechanical effect.

Submitted at: May 31, 2005
Accepted at: Nov. 24, 2005

Citation

S. B. Munteanu, C. Vasile, SPECTRAL AND THERMAL CHARACTERIZATION OF STYRENE BUTADIENE COPOLYMERS WITH DIFFERENT ARCHITECTURES, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 3135-3148 (2005)