Changes in crystal structure parameters and thermal mechanical properties of poly(p-phenylene terephthalamide) fibers under different annealing conditions

Autor:	Zongquan Wu, Baojun Qian, Anqiu Zhang, Stephen Z. D. Cheng, Bing Huang
Rok vydání:	1990
Předmět:	Diffraction Materials science Polymers and Plastics Annealing (metallurgy) Small-angle X-ray scattering Crystal orientation Crystal structure Condensed Matter Physics Synthetic fiber Thermal mechanical Poly(p-phenylene) Materials Chemistry Physical and Theoretical Chemistry Composite material
Zdroj:	Journal of Polymer Science Part B: Polymer Physics. 28:2565-2583
ISSN:	1099-0488 0887-6266
DOI:	10.1002/polb.1990.090281308
Popis:	As-spun poly (p-phenylene terephthalamide)(PPTA) fibers have been annealed by three different methods: (1) the relaxation mode; (2) the constant temperature mode; and (3) the constant tension mode. Wide-angle x-ray diffraction (WAXD) was used with all three modes to characterize the changes in three crystal structure parameters: the degree of crystal orientation, the apparent crystal size, and the lattice strain along the c-axis of the crystal unit cell. It was found that internal stresses in the fibers, which are frozen-in during either the fiber spinning process or in later anealing, is the key factor causing these structure parameter changes
Databáze:	OpenAIRE
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