Abstract
Microscopically-viewed structural change of polyethylene (PE) in isothermal crystallization from the melt was investigated by the time-resolved measurements of high-resolution FT-IR spectra. The samples were a high-density PE and a linear low-density PE with ca. 17 ethyl branchings/1000 carbons. The latter was used to reduce the crystallization rate and to make structural change clearer than the case of the former sample. At the early stage of the isothermal crystallization, IR bands characteristic of the conformationally-disordered trans sequences were found to increase in intensity. After keeping the maximum for a while, the intensity of these disordered trans bands began to decrease and that of the regular trans bands characteristic of the orthorhombic crystal gradually increased instead. The FT-IR data showed that the conformationally-disordered short trans sequences appear at first in the random coils of the melt and these disordered trans sequences grow to the longer and regular trans sequences of the orthorhombic-type crystal. The disordered trans form is considered to play an important role as a kind of nucleus for the crystallization of the orthorhombic form.
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Tashiro, K., Sasaki, S., Gose, N. et al. Microscopically-Viewed Structural Change of Polyethylene during Isothermal Crystallization from the Melt I. Time-Resolved FT-IR Spectral Measurements. Polym J 30, 485–491 (1998). https://doi.org/10.1295/polymj.30.485
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DOI: https://doi.org/10.1295/polymj.30.485
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