Crystalline Phases in Nylon-11: Studies Using HTWAXS and HTFTIR

Autor:	C. Ramesh, Kohji Tashiro, Smitha S. Nair
Rok vydání:	2006
Předmět:	Nylon 11 Polymers and Plastics Chemistry Scattering Transition temperature Organic Chemistry Casting Inorganic Chemistry Crystallography chemistry.chemical_compound Reflection (mathematics) Phase (matter) Materials Chemistry Trifluoroacetic acid
Zdroj:	Macromolecules. 39:2841-2848
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma052597e
Popis:	Nylon-11 was crystallized into different crystalline phases by appropriate methods. The change in the structure during heating was monitored in situ by wide-angle X-ray scattering (WAXS). The α phase obtained by precipitating nylon-11 in 1,4-butanediol started transforming into the pseudohexagonal phase on heating, but the transformation was not fully completed before melting. The melt crystallized sample at 175 °C gave the pseudohexagonal phase, which transformed into the α‘ phase on cooling to room temperature at about 100 °C. The d spacing of the 001 reflection also showed a change at the transition temperature. The melt-quenched sample showed the pseudohexagonal phase, which did not change during heating, but on cooling transformed into α‘ phase. The γ phase was obtained by casting nylon-11 in trifluoroacetic acid (TFA), and it changed into the pseudohexagonal phase at about 110 °C on heating. The d spacing of the 001 reflection depended on the way in which it was obtained. The studies have shown that...
Databáze:	OpenAIRE
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