ISSN:
0887-6266
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
The shear modulus and loss of ca. 30% crystalline nylon-12 have been measured over the temperature range 100-440 K and frequency range 10-4-1 Hz. The effect of water and physical aging of the amorphous regions on the relaxation spectra have been investigated. Absorbed water decreases both the temperature and height of the γ-relaxation peak, induces a β-relaxation peak, and decreases the temperature of the α-relaxation peak. These results are interpreted in terms of the hydrogen-bonding effect of water on nylon-12 monomer and polymer. The G″ spectrum of the polymer has a half-width of ca. 6 decades of frequency, and neither the G″, nor G″, nor the tan φ spectra can be superposed by shifting along the frequency axis. The large half-width is attributed to the random distribution of crystalline regions in the polymer. The results are further discussed in terms of hydrogen-bonding, with or without H2O, and compared with the properties of other nylons.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/polb.1990.090281315
