Abstract
The limiting viscosity number [η] and the number-average molecular weight Mn were measured on polyethyleneterephthalate (PET) and polyethylene-1, 2-diphenoxyethane-p, p′-dicarboxylate (PEPC) fractions in o-chlorophenol (OCP) and phenol/tetrachloroethane (P/T, 1/2, W/W) mixture. The following Mark—Houwink—Sakurada relations were established:
From these viscosity data as well as literature data the Flory K value (and hence, the conformational parameter a) was determined, by use of the Kamide, et al., plot and the Stockmayer and Fixman plot, as 0.160 (1.22) for PET and 0.251 (1.35) for PEPC. The large discrepancy in viscosity data of other literature and this study could well be explained in terms of the polydispersity of the polymer samples used. It has been concluded that a PEPC chain is less flexible than a PET chain.
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Kamide, K., Miyazaki, Y. & Kobayashi, H. Unperturbed Chain Dimensions of Polyethyleneterephthalate and Polyethylene 1,2-Diphenoxyethane p, p′-Carboxylate. Polym J 9, 317–327 (1977). https://doi.org/10.1295/polymj.9.317
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DOI: https://doi.org/10.1295/polymj.9.317
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