STUDY OF CURE KINETICS OF POLYACRYLAMIDE HYDROGELS BY DIFFERENTIAL SCANNING CALORIMETRY

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SINGHAL R.; SACHAN S.; RAI J.S.P.

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Journal Paper

Paper Information

Journal: Iranian Polymer Journal Year:2002 | Volume:11 | Issue:3 Page(s): 143-149

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Title

STUDY OF CURE KINETICS OF POLYACRYLAMIDE HYDROGELS BY DIFFERENTIAL SCANNING CALORIMETRY

Author(s)

SINGHAL R. | SACHAN S. | RAI J.S.P. | Issue Writer Certificate

Keywords

HYDROGELS

POLYACRYLAMIDE

DIFFERENTIAL SCANNING CALORIMETRY

CURE KINETICS

SWELLING BEHAVIOUR

Abstract

Polyacrylamide (PAAm) HYDROGELS were synthesized by partial cross-linking of PAAm using p-formaldehyde as curing agent. The cross-linking reaction was studied using differential scanning calorimeter (DSC) and CURE KINETICS was determined. The dynamic DSC scans of freshly mixed reaction mixture that showed an endothermic peak corresponding to cure at 75±1° C, indicate multiple reactions. The FTIR studies of curing reactions indicated that alkaline hydrolysis of PAAm was also occurring during curing as evident by generation of carboxylic group in the cured PAAror HYDROGELS. In the initial phase of cross-linking reaction and at lower temperature rapid hydrolysis occurred which was endothermic in nature, but at higher temperature curing reaction was favoured. Isothermal CURE KINETICS revealed that curing reaction was n th order type and followed third order kinetics. The study also indicates that with the degree of conversion 0 .25-0.26. both curing and hydrolysis occurs simultaneously but at higher conversions curing reaction proceedes alone. The swelling studies also indicates that the swelling index of PAAm HYDROGELS increases with decreasing curing agent concentration: but increases with increasing swelling duration and curing time, and molecular weight of polymer.

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APA: Copy

SINGHAL, R., SACHAN, S., & RAI, J.S.P.. (2002). STUDY OF CURE KINETICS OF POLYACRYLAMIDE HYDROGELS BY DIFFERENTIAL SCANNING CALORIMETRY. IRANIAN POLYMER JOURNAL (ENGLISH), 11(3), 143-149. SID. https://sid.ir/paper/536442/en

Vancouver: Copy

SINGHAL R., SACHAN S., RAI J.S.P.. STUDY OF CURE KINETICS OF POLYACRYLAMIDE HYDROGELS BY DIFFERENTIAL SCANNING CALORIMETRY. IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2002;11(3):143-149. Available from: https://sid.ir/paper/536442/en

IEEE: Copy

R. SINGHAL, S. SACHAN, and J.S.P. RAI, “STUDY OF CURE KINETICS OF POLYACRYLAMIDE HYDROGELS BY DIFFERENTIAL SCANNING CALORIMETRY,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 11, no. 3, pp. 143–149, 2002, [Online]. Available: https://sid.ir/paper/536442/en

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