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Nondestructive testing of defects in adhesive joints

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log (C α - C t )<br />

1.0<br />

0.9<br />

0.8<br />

0.7<br />

0.6<br />

0.5<br />

0.4<br />

0.3<br />

0.2<br />

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140<br />

c<br />

Time [m<strong>in</strong>]<br />

a<br />

b<br />

Fig.2. log (C∞ - Ct) versus time for water uptake by block copolymers:<br />

(a) NR/PEG (4000/4000) – 1, (b) NR/PEG (4000/4000) – 2, (c) NR/PEG (4000/4000) – 3<br />

(d) NR/PEG (4000/4000) – 4.<br />

Q t (mol%)<br />

12<br />

10<br />

8<br />

6<br />

4<br />

2<br />

0<br />

0 20 40 60 80 100 120<br />

t 1/2<br />

a<br />

Fig.3. Percentage mass uptake for the block copolymers at pH 9:<br />

(a) NR/PEG (4000/4000) – 1, (b) NR/PEG (4000/4000) – 2, (c) NR/PEG (4000/4000) – 3<br />

(d) NR/PEG (4000/4000) – 4, (e) NR/PEG (4000/4000) – 5.<br />

d<br />

d<br />

b<br />

c<br />

e

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