Poly[trans-bis(tributylphosphine)platinum 1,4-butadiynediyl] (PPBD) in heptane at 25°C was studied by viscosity and sedimentation velocity measurements over a range of weight-average molecular weight Mw from 7×103 to 1.4×105. Although the chemical structure of PPBD suggests a very rigid nature of the chain, the measured value 1.1 for the exponent in the Mark–Houwink–Sakurada [η] (intrinsic viscosity)–Mw relation indicated an appreciable flexibility of the chain. The data for [η] and sedimentation coefficient as functions of Mw were analyzed by the Yamakawa–Fujii theories for a wormlike cylinder, yielding ML=810±60 nm−1, q=13±3 nm, and d=1.2±0.3 nm, where ML is the molecular weight per unit contour length, q is the persistence length, and d is the diameter of the cylinder. The flexibility of PPBD indicated by this q value is comparable to that of cellulose nitrate which is known to be a typical stiff polymer.
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Motowoka, M., Norisuye, T., Teramoto, A. et al. Dilute-Solution Behavior of a Rigid Polymer, Poly[trans-bis(tributylphosphine)platinum 1,4-butadiynediyl]. Polym J 11, 665–670 (1979). https://doi.org/10.1295/polymj.11.665
- Dilute Solution
- Poly-yne Polymer
- Poly[trans-bis(tributylphosphine)platinum 1,4-butadiynediyl]
- Rigid Polymer
- Wormlike Chain
- Persistence Length
- Intrinsic Viscosity
- Sedimentation Coefficient
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