5192606024

- + x

Ądyanced Sęąrch (ACS Publicatłons)_^ Chromium ma00028a045.pdf

Plik Edycja ^idok Przejdź Pomo£ 4 Poprzednia ♦ Następna

(3 Z 5)

Dopasuj do szerokości *

Miniatury ▼ X

1
Ę fi M	i
	2
	W m

.1

O Menu

Macromolecules, Vol. 25, No. 2, 1992

1800

t-r

1750    1700

Wavsru.rr.be' (cm’}

1650

Figurę 4. FTIR spectra of the EMAA[26J-PVME diffusion couple as a function of time at 110 °C.

to a single homogeneous phase. In our experimental

Polymer-Polymer Mutual Diffuaion 799 Table I

Ezperimental Peak Areas for the Carbonyl Region of EMAA[26] and the Reaulting Fraction of Free Carbonyls

time,

h

area

1698 cm'¹

1730 cm

-i

fraction of free carbonyls

0.0	3.778 N	0	0.00
8.9	2.318	1.022	0.41
14.3	2.188	1.089	0.44
24.0	1.458	1.681	0.65
31.0	1.396	1.669	0.66
48.5	1.406	2.202	0.71
72.7	1.293	3.235	0.80
313.8	0.996	3.456	0.85

of free carbonyls, the composition, and, ultimately, the diffusion coefficient of this system. We will First consider the relationship between the fraction of free carbonyls and the concentration of species and then later incorporate the relationship between the composition and the diffusion coefficient.

The fraction of free carbonyl groups is a function of the composition of the system. Since the two componenta are diffusing together, the overaU composition of the system is a function of distance along the diffusion path, z, and the time, t. Since the IR measurement is performed in transmission, parallel to the diffusion path, the infrared beam is sampling the entire diffusion path at any given

fT Advanced Search (...

[PrezentacjaFTlR.o... |

□

mihaly.yp

(JPo(ySciPolyChem_... J