- 作者: Lin, Chen-Chong; Chiu, Wen-Yen
- 作者服務機構: Department of Chemical Engineering, National Taiwan University Taipei, Taiwan, R.O.C.
- 中文摘要: --
- 英文摘要:
Capillary flow measurements were carried out on a non-lubricated ABS
resin over a temperature range from 163 to 190℃ at stress levels from 10^6 to 10^7
dyne/cm2 to obtain flow curves.
The shift factor in terms of polymer melt viscosity conformed well to the
WLF equation and coefficients for Tg of 95℃ were calculated to be C2q=35.5°K
and C1q=17.3 which were in good agreement with the universal values.
On the other hand, stress-relaxation measurements were carried out on the same
material over a temperature range from 100 to 150℃ at a constant strain of 5×10^-2.
The shift factor in terms of relaxation modulus conformed well to the WLF
equation and coefficients for Tg of 95℃ were calculated to be C2q=34.5°K and
C1q=17.6 which were in good agreement with those obtained in capillary flow
measurements.
The discrete relaxation spectrum was obtained by using results of stress-relaxation
moduli. By using Pao's theory, the flow curves at 163℃ were calculated from the
discrete relaxation spectrum and compared with those obtained from capillary flow
measurements. The shapes of two curves were essentially identical. The width
of the entanglement (rubbery) plateau was found to be 4.1 which is much greater
than that of 2.9 reported by Blyler with lubricated polymer. Moreover, an unstable
polymeric now is observed at higher stress over 6×10^6 dyne/cm2 in the capillary flow
measurements. Similar behavior is observed in the calculated flow curve from
stress-relaxation experiments. - 中文關鍵字: --
- 英文關鍵字: --