Abstract
The state diagram of the low-density polyethylene–p-xylene system that contains the solubility curve of p-xylene in the polymer is first built using the optical method with the involvement of the DSC data. It has been shown that, at 72°C, in a blend with a polymer mass fraction of 0.28, the full amorphization of the polymer proceeds simultaneously with the dissolution of p-xylene in it. Blends with a lower polymer content are also homogenized at the same temperature, although the duration of this process can take several days. In blends with a high polymer content, homogenization occurs at a higher temperature. This process is preceded by the formation of microheterogeneous single-phase gel with network junctions as polymer crystallites and amorphous regions saturated by p-xylene. Cooling of the homogeneous blends to–20°С is not accompanied by the full separation of low- and high-molecular-mass phases; in this case p-xylene not only forms an individual crystalline phase, but also partially crystallizes in amorphous regions of the polymer.
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Original Russian Text © A.N. Il’yasova, G.A. Shandryuk, Y.V. Kudryavtsev, T.N. Lebedeva, M. Lutovac, K.V. Pochivalov, 2016, published in Vysokomolekulyarnye Soedineniya, Seriya A, 2016, Vol. 58, No. 6, pp. 661–670.
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Il’yasova, A.N., Shandryuk, G.A., Kudryavtsev, Y.V. et al. Phase equilibria and transformations in low-density polyethylene–p-xylene system. Polym. Sci. Ser. A 58, 1017–1024 (2016). https://doi.org/10.1134/S0965545X16060092
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DOI: https://doi.org/10.1134/S0965545X16060092