Abstract
Poly(1-olefin)s from poly(1-butene) up to poly(1-octadecene) have been characterized. The melting point was measured by Differential Scanning Calorimetry (DSC-1B) and dilatometry, the specific volume and volume expansion coefficient by dilatometry, and the unperturbed chain dimension by intrinsic viscosity at near theta conditions. A trend is confirmed for melting points and revealed for expansion coefficients of first a decrease with increasing side-chain length in the polyolefins, followed by an increase with further increase in length. The minimum is near poly(1-hexene) and poly(1-heptene). The specific volume of the poly(1-olefin) series exhibits a maximum around this same composition. The minima in melting point and thermal expansion coefficient and the maximum in specific volume are discussed in terms of chain-to-chain packing density. It is suggested that packing density is a minimum in this region. Two melting points were found for each of several higher poly(1-olefin)s from poly(1-tridecene) up to poly(1-octadecene). It is found that the theta temperatures of the poly(1-olefin) series, as measured in two solvents, anisole and cyclohexanone, exhibit a minimum at poly(1-pentene). However, the characteristic ratios and the steric factors increase with increasing side-chain length for the entire series of measured poly(1-olefin)s.
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Wang, Js., Porter, R. & Knox, J. Physical Properties of the Poly(1-olefin)s. Thermal Behavior and Dilute Solution Properties.. Polym J 10, 619–628 (1978). https://doi.org/10.1295/polymj.10.619
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DOI: https://doi.org/10.1295/polymj.10.619