Citation: Jian-bin Song, Qing-yong Chen, Min-qiao Ren, Xiao-hong Sun, Hui-liang Zhang, Hong-fang Zhang, Shu-yun Wang, Zhi-shen Mo. MULTIPLE MELTING AND CRYSTALLIZATION BEHAVIOR OF NYLON 1212[J]. Chinese Journal of Polymer Science, ;2006, 24(2): 187-193. shu

MULTIPLE MELTING AND CRYSTALLIZATION BEHAVIOR OF NYLON 1212

Received Date: 26 April 2005
Revised Date: 1 June 2005

The wide-angle X-ray diffraction (WAXD) patterns of isothermally crystallized Nylon 1212 show that -form crystals form below 90℃ and the -form crystals can exist above 140℃. In the temperature range of 90140℃ the -form and -form crystals coexist. Variable-temperature WAXD exhibits that the nylon 1212 -form does not show crystal transition on heating, while -form isothermally crystallized at 160℃ exhibits Brill transition at a little higher than 180℃ on heating. The multiple melting behaviors of Nylon 1212 isothermally crystallized from melt come from a complex mechanism of different crystal structures, dual lamellar population and melting-recrystallization. In polarized optical microscope (POM) observations, Nylon 1212 isothermally crystallized at 175℃ shows the ringed banded spherulites. However, at temperatures below 160℃ the ringed banded image disappears, and cross-extinct spherulites are formed.
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