期刊
ANALYTICA CHIMICA ACTA
卷 604, 期 1, 页码 54-61出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2007.08.009
关键词
styrene-butadiene block; copolymers; nuclear magnetic resonance (NMR); relaxation; polystyrene; microphase separation; butadiene
The properties of styrene-butadiene-styrene (SBS) block copolymers do not only depend on the butadiene content and the degree of polymerisation but also on their chain architecture. In this contribution we present the results of a low-field time domain (TD) NMR study in which the transverse relaxation behaviour of different SBS block copolymers was analysed and correlated with findings from mechanical testing on pure and blended materials and transmission electron microscopy data which provide information on the microphase separation. The results indicate that while a straightforward determination of the butadiene content as in blended materials like ABS is not possible for these materials, the TD-NMR results correlate quite well with the mechanical performance of blends from SBS block copolymers with general purpose polystyrene (GPPS), i.e. industrial grade homopolymer polystyrene. Temperature-dependent experiments on pure and blended materials revealed a slight reduction in the softening temperature of the GPPS fraction in the blends. (c) 2007 Elsevier B.V. All rights reserved.
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