Abstract
The crystalline transition behavior of polyamides X 18, where X = 2, 4, 6, 8, 10 and 12, has been studied by variable-temperature wide-angle X-ray diffraction (WAXD) and real-time Fourier-transform infrared (FTIR) spectroscopy. It was found that polyamides 2 18 and 4 18 undergo the Brill transition on heating for both the melt-crystallized samples and the solution-crystallized samples. For polyamide 6 18, the melt-crystallized sample undergoes Brill transition before melting but the solution-crystallized sample melts prior to the complete crystalline transition. Polyamides 8 18, 10 18 and 12 18 do not undergo the Brill transition perfectly in advance of melting for either melt-crystallized or solution-crystallized samples. Real-time FTIR analysis of polyamides X 18 provided helpful information for understanding the mechanism of the crystalline transition. Copyright © 2004 Society of Chemical Industry
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