Abstract
Light scattering and viscosity measurements on dilute solutions of cyclized cis-1,4-polybutadiene polymers (CBR) with different degrees of cyclization (DC) and their fractions are reported in this paper. The data were obtained in both cyclohexane and mixed theta solvents at 30.0°C. The curves of the intrinsic viscosity [η]0 in mixed theta solvents vs. the weight average molecular weight Mw for CBR with DC over 30% exhibited two distinct regions with slopes of 0.5 and less. Thus, the exponent in the viscosity equation is the same as that for the original uncyclized samples at Mw below the critical point Mwc and decrease with increasing DC at Mw above Mwc. The Mwc shifts to lower Mw as DC is increased. The relation of the molecular structure of CBR with DC is discussed. The results led to the conclusions that 1) at DC below 25%, the molecules are linear in the overall structure, but locally contain short intramolecular cyclic structures, e.g., mono- and/or bicyclic structures, 2) at DC between 25 and 60%, the molecules are randomly branched, and 3) at DC over 80%, the molecules have probably very compact structure formed by internal crosslinks.
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Yamamoto, K., Bessho, N., Shiibashi, T. et al. Dilute Solution Properties of Cyclized Polybutadiene. Polym J 13, 555–561 (1981). https://doi.org/10.1295/polymj.13.555
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DOI: https://doi.org/10.1295/polymj.13.555