Multiple melting and crystallization behavior of nylon 1212
Data(s) |
2006
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Resumo |
The wide-angle X-ray diffraction (WAXD) patterns of isothermally crystallized Nylon 1212 show that gamma-form crystals form below 90 degrees C and the alpha-form crystals call exist above 140 degrees C. In the temperature range of 90-140 degrees C, the a-form gamma-form crystals coexist. Variable-temperature WAXD exhibits that the nylon 1212 gamma-form does not show crystal and transition on heating, while a-form isothermally crystallized at 160 degrees C exhibits Brill transition at a little higher than 180 degrees C 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 degrees C shows the ringed banded spherulites. However, at temperatures below 160 degrees C the ringed handed image disappears, and cross-extinct spherulites are formed. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Song JB;Chen QY;Ren MQ;Sun XH;Zhang HL;Zhang HF;Wang SY;Mo ZS.Multiple melting and crystallization behavior of nylon 1212,CHINESE JOURNAL OF POLYMER SCIENCE,2006,24(2):187-193 |
Palavras-Chave | #X-RAY-DIFFRACTION #DSC #TRANSITION #KINETICS |
Tipo |
期刊论文 |