Abstract
Average crystal thickness and its size distribution in the molecular chain direction of polyethylenes crystallized under a high pressure of about 500 MPa were determined statistically by fuming nitric acid degradation followed by gel-permeation chromatography (GPC) measurement for molecular weight distribution of the degraded samples. The observed GPC curves were corrected for instrumental spreading by Chang–Huang’s method in order to estimate precisely the crystal size distributions. Several important facts were found. First, the so-called extended-chain crystals which show a main melting peak at ca. 415 K on the DSC curve consisted of two constituents having lamellar thicknesses of highly extended-chain crystals and ordinary extended-chain crystals, which corresponded to the thermal behavior observed before by DSC and high-pressure dilatometry. Second, it was found that the average crystal thickness of ordinary extended-chain crystals is between one half and one third the average thickness of highly extended-chain crystals. Third, it seems that folded-chain structure exists in the ordinary extended-chain crystals having an average thickness of several hundred nanometers.
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Maeda, Y., Kanetsuna, H. Crystallite Size Analysis of Pressure-Crystallized Polyethylene by Nitric Acid Etching and Gel-Permeation Chromatography. I. Extended-Chain Crystals. Polym J 13, 357–369 (1981). https://doi.org/10.1295/polymj.13.357
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DOI: https://doi.org/10.1295/polymj.13.357
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