TY  - JOUR
T1  - Swelling and Mechanical Properties of Polyacrylamide Based Hydrogels
Prepared by Radiation Induced Polymerization
AU - Syla, N. AU - Aliaj, F. AU - Rendevski, S. AU - Mahmudi, N. 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 17
SP  - 7205
EP  - 7209
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.7205.7209
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.7205.7209
KW  - cross-link
KW  -swelling equilibrium
KW  -hydrogels
KW  -gamma rays
KW  -Copolymers
KW  -mechanical test
AB  - The swelling and mechanical properties of Acrylamide/Methacrylamide (AAm/MAAm) and
Acrylamide/Methacrylamide/Methylenebisacrylamide (AAm/MAAm/MBA) hydrogels prepared by radiation
induced polymerization has been investigated in this study. The doses of irradiation have been determined to
be optimum, corresponding to complete conversion or to control the swelling and mechanical properties of the
obtained polymer networks. There was determined the swelling kinetics such as swelling ratio k<sub>s</sub>, transport s
exponent n, diffusion coefficient d and diffusion constant k related to the structure of polymer crosslinked
network. The study revealed that different crosslinked networks can be obtained by using different amount of
crosslinker  MBA which alters the swelling characteristics of the hydrogel. The molecular weight between
crosslinks MBA and the effective cross-link  <span style="text-decoration:overline">Mc</span> density of hydrogels v<sub>e</sub> were calculated from swelling while shear e
modulus data were obtained from compression tests. Stress-strain curves of hydrogels were evaluated to
calculate shear modulus values G, the average molecular weight between junctions <span style="text-decoration:overline">Mc</span>  and the effective
crosslink density v<sub>e</sub> . A comparative analysis between the cross-link density v<sub>e</sub> or average molecular weight of e e
hydrogels by using swelling tests and mechanical measurements has been made. Results have shown that
simple compression analyses can be used for the determination of the effective cross-link density of
hydrogels v<sub>e</sub> without the need for some polymer-solvent based parameters as in the case of swelling based e
determinations.
ER  -