Preparation and characterization of polyacrylamide in cationic microemulsion

Yan, Feng; Zheng, Chao; Zhai, Xiaodong; Zhao, Dejun

doi:10.1002/(sici)1097-4628(19980124)67:4<747::aid-app17>3.0.co;2-0

Cited by 27 publications

(20 citation statements)

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“…Also, its FTIR spectrum confirms well with the reported one 20. Inherent viscosity of the obtained polymer via this method in water at 25°C is 1.53 dl/g (C = 0.3680 g/dl).…”

Section: Resultssupporting

confidence: 85%

Thermal and kinetic study of radical polymerization I. Melt state bulk polymerization of acrylamide by DSC

Mahdavian

Zandi

2003

J of Applied Polymer Sci

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Radical-initiated bulk polymerization of acrylamide in the presence of potassium persulfate in the melt phase has been investigated by differential scanning calorimetry (DSC). The method presented here has been carried out in isothermal condition. This not only saves energy and time but also has some less probable side effects. Side effects such as evaporation and imidization could affect the final yield and properties of the obtained product. Different temperatures have been examined for isothermal polymerization to find out the optimum temperature with complete conversion of acrylamide to its corresponding polymer. During the polymerization process, high-molecular-weight polyacrylamide is being produced without any significant loss in total yield. The molecular weight was determined by inherent viscosity measurement. Also, no side reaction such as imidization resulting in partial insolubility or crosslinked product was being observed. It is noteworthy that we believe DSC studies show the existence of living radicals that has not been reported before.

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“…Also, its FTIR spectrum confirms well with the reported one 20. Inherent viscosity of the obtained polymer via this method in water at 25°C is 1.53 dl/g (C = 0.3680 g/dl).…”

Section: Resultssupporting

confidence: 85%

Thermal and kinetic study of radical polymerization I. Melt state bulk polymerization of acrylamide by DSC

Mahdavian

Zandi

2003

J of Applied Polymer Sci

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“…As shown in Fig. 1, the amide C=O and amide NH bands of PAM appeared at 1676 and 1616 cm -1 , respectively (Yan et al 1998;Freddi et al 1999). The protonated carboxyl groups of TOCN-COOH had an absorption band at 1723 cm -1 , from C=O stretching, and hydrogen boning can occur between two carboxyl groups (Fujisawa et al 2011).…”

Section: Mechanism Of Improvement Of Tensile Properties Of Pam/tocn Cmentioning

confidence: 85%

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Kurihara

Isogai

2015

Cellulose

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2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNs) and poly(acrylamide) (PAM) with sodium carboxylate groups (TOCN-COONa and PAM-COONa, respectively) were converted to TOCN and PAM with protonated carboxyl groups (TOCN-COOH and PAM-COOH, respectively). Transparent and flexible PAM-COOH/TOCN-COOH, PAM-COONa/TOCN-COOH, and PAM-COOH/TOCN-COONa composite films were prepared by mixing aqueous PAM-COOH or PA M-COONa solutions and aqueous TOCN-COOH or TOCN-COONa dispersions with various PAM/TOCN weight ratios, and successive casting/drying of the mixtures. In all cases, the Young's modulus and tensile strength of the composite film were highest when the PAM content of the composite film was in the range 10-25 %. PAM therefore has the potential to reinforce TOCN films, irrespective of the sodium carboxylate groups or protonated carboxyl groups of TOCN or PAM. Although the FT-IR spectra of the PAM-COOH/TOCN-COOH composite films with various PAM/TOCN weight ratios indicated the formation of hydrogen bonds between PAM-COOH and TOCN-COOH, the formation of these hydrogen bonds could not explain the reinforcing effect achieved by PAM addition to TOCN-COOH. Because the TOCN elements form nematic-ordered or selfaligned domain structures in aqueous dispersions, PAM molecules at the corresponding PAM contents are probably present around the boundary regions of TOCN domains, and fill or cover the defects present between the TOCN domains.

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“…PAAm did not show any characteristic crystalline peak, indicating PAAm is an amorphous material. 18 If KGM and PAAm have low compatibility, each polymer would have its own crystal region in the blend films, so X-ray diffraction patterns are expressed as simply mixed patterns of KGM and PAAm, with the same ratio as those for blending. However, the weak crystalline peak appeared at 2 ϭ 10°in the blends when PAAm content was low (Յ30%).…”

Section: General Properties Of the Filmsmentioning

confidence: 99%

“…17 Polyacrylamide (PAAm), a watersoluble synthetic polymer, is widely used as flocculating, paper-strengthening agents, and also can be applied to enhance the recovery of oil. 18 PAAm can potentially form hydrogen bonds with KGM because of the ability of several primary amide groups on its chain backbone to interact with aceto and hydroxyl groups of KGM. Moreover, PAAm is a polymer of biomedical and pharmaceutical interest, widely studied as a hydrogel for blood-compatible applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and physical properties of konjac glucomannan–polyacrylamide blend films

Xiao

Zhang

2001

J of Applied Polymer Sci

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ABSTRACT:The blend films of konjac glucomannan (KGM) and polyacrylamide (PAAm) were prepared by using the solvent-casting technique. Transparent blend films were obtained in all blending ratios. The physical properties of the films were investigated by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and by measurement of mechanical properties. The results indicated the occurrence of intra-and intermolecular interactions of the pure components, as well as the intermolecular interactions between KGM and PAAm through hydrogen bond formation. The thermal stability and mechanical properties of both tensile strength and elongation at break of the films were improved by blending KGM with PAAm. It was worth noting that the blend film had the greatest tensile strength when the KGM content in the blend films was around 30 wt %. Surface morphology of the films observed by SEM was consistent with the above-noted results. Furthermore, the water absorbability of the blend films was also investigated.

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Preparation and characterization of polyacrylamide in cationic microemulsion

Cited by 27 publications

References 0 publications

Thermal and kinetic study of radical polymerization I. Melt state bulk polymerization of acrylamide by DSC

Thermal and kinetic study of radical polymerization I. Melt state bulk polymerization of acrylamide by DSC

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Preparation and physical properties of konjac glucomannan–polyacrylamide blend films

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