A durable press cotton fabric has 6% add-on of DMDHEU. Assume that the molecular weight of anhydro glucose unit (agu) and the reaction efficiency (%) are 162 and 100 respectively
Question 75 (Textile Engineering & Fibre Science)
The number of crosslinks per agu is approximately
| (A) | 0.007 |
| (B) | 0.07 |
| (C) | 0.7 |
| (D) | 7.0 |
[Show Answer]
Option B is correct.
Given in the question-
DMDHEU
Add-on %=6%
Molecular weight of anhydro glucose unit (agu)=162
The reaction efficiency=100%
The nitrogen add-on%=?
Molecular structure of DMDHEU
Molecular weight of DMDHEU=178
Molecular weight of nitrogen=28
Nitrogen%=28 x 100/178
Nitrogen% on DMDHEU=15.73
Let the weight of fabric=100 kg
Then, weight of finish=100 x 6%
Weight of finish=6 kg
The number of crosslinks per agu=?
The number of cross links=wt of finish in gm/m.w. of DHDHEU
The number of cross links=6000 /178
The number of cross links=33.70
Similarily,
The number of AGU=Wt of fabric in gm/M.W of AGU
The number of AGU=100000/162
The number of AGU=617.3
Now,
The number of crosslinks per agu=The number of cross links/The number of AGU
The number of crosslinks per agu=33.70/617.3
The number of crosslinks per agu=0.055
=0.06 (Ans)