Table 2
Summary of activities performed with acrylamide-based polymers and organic crosslinkers.
| Year | Activity | Authors |
|---|---|---|
| 1984 | Formation of the first gels by organic crosslinking – PAM/resorcinol-formaldehyde and PAM/phenol-formaldehyde | Chang et al. |
| 1993 | Developed phenol-formaldehyde crosslinked systems | Moradi-Araghi |
| 1996 | Produced and reported the application of PAM gels crosslinked with HQ–HMTA for use in high-temperature reservoirs | Hutchins et al. |
| 1997 | Observed a long gelation time and thermal stability of PAM/HQ–HMTA systems | Dovan et al. |
| 1997 | Developed phenol-formaldehyde systems | Bryant et al. |
| 1998 and 1999 | Produced the first stable crosslinked by PEI | Hardy et al. |
| 2000 | Developed phenol-formaldehyde crosslinked systems | Moradi-Araghi |
| 2007 | Investigated the viscoelastic properties of gels formed by PAM–tBA and PEI | Al-Muntasheri et al. |
| 2008b | Studied gelling kinetics of PAM/PEI systems under HTHP conditions | Al-Muntasheri et al. |
| 2009 | Developed a comparative study between PAM/PEI and PAM–tBA/PEI | Al-Muntasheri et al. |
| 2010 | Investigated the influence of polymer concentration and molecular weight on PHPA/PEI hydrogels | Jia et al. |
| 2011 | Evaluated the performance of PHPA/PEI systems | Zhao et al. |
| 2012 | Conducted studies of the properties of PAM/HQ–HMTA hydrogels | Sengupta et al. |
| 2012 | Concluded that several factors influence the gelling performance of PHPA/PEI systems | Jia et al. |
| 2012 | Developed a delayed gel system consisting of PHPA, PEI, and dextran sulfate | Jayakumar and Lane |
| 2013a, b | Studied the gelling kinetics of gels formed by PHPA/HQ–HMTA | Yadav and Matho |
| 2013 | Developed gel systems with PHPA, PEI and AMPS | Jayakumar and Lane |
| 2014 | Investigated the influence of several factors on PAM/HQ–HMTA systems | Sengupta et al. |
| 2014b, c | Evaluated the action of NaCl and NH4Cl in PAM/PEI systems | El-Karsani et al. |
| 2015b | Prepared systems with hydrophobically associated polyacrylamide and PEI | Bai et al. |
| 2016 | Investigated the influence of several factors on PAM/HQ–HMTA systems | Liu et al. |
| 2016 | Studied systems formed by PHPA and PEI | Hashmat et al. |
| 2017 | Developed PHPA/HQ–HMTA gel systems with resistance to HTHS conditions | Fang et al. |
| 2017 | Produced gel systems formed by a terpolymer of AM, AA and AMC16S, crosslinked by PEI | Zhang et al. |
| 2017 | Developed systems composed of PHPA, PEI and silica nanoparticles | Ma et al. |
| 2018 | Developed PAM–PEI systems reinforced with nanosilica | Chen et al. |
| 2018 | Studied the action of nanosilica as a reinforcement filler in PAM/resorcinol-HMTA systems | Lashari et al. |
| 2018 | Developed gel systems with multiple crosslinking, formed by PHPA, Cr(III) acetate and PEI | Jia and Chen |
| 2018 | Developed PHPA/PEI systems reinforced with coal fly ash | Adewunmi et al. |
| 2019 | Studied the effects of several factors on the gelation performance of hydrogels formed by terpolymer (AM–AMPS–NVP) and PEI | Zhu et al. |
| 2019 | Evaluated systems formed by acrylamide-based polymers, PEI, and bentonite | Tessarolli et al. |