Journal of Agricultural and Food Chemistry
Article
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superabsorbent composite. The higher content of NHMAAm
was associated with the lower extent of degradation, which
confirmed reasonably well with their WA (WA was 227, 180,
and 132 g/g, respectively). Similar results were reported in the
literature.35,36 As the slice of P(AA-AMPS-NHMAAm)/WS
was incubated in the solution, it was swelled, and the water
molecules diffused into the network of the superabsorbent
composite. Meanwhile, the degradation occurred, and the ether
linkages between −CH2OH and −OH or two −CH2OH broke
homogeneously throughout the degradation process. This
ongoing break of cross-links within the polymer decreased
the cross-linking density of the network. So, the high WA could
result in a high extent of degradation. In addition, as the Figure
10 caption describes, the extent of degradation increased with
the time prolonging. After degradation in soil solution for 50
days, the extent of degradation of P(AA-AMPS-NHMAAm)/
WS reached to 85.6, 63.5, and 47.7% for NHMAAm contents 1,
2, and 3%, respectively. It is remarkable that the coating
material based on WS and NHMAAm imparted the product
with a high extent of degradation, low production cost, and
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simultaneously make the technique quite environmentally
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AUTHOR INFORMATION
(12) Xie, L.; Liu, M.; Ni, B.; Zhang, X.; Wang, Y. Slow-release
nitrogen and boron fertilizer from a functional superabsorbent
formulation based on wheat straw and attapulgite. Chem. Eng. J.
2011, 167, 342−348.
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Corresponding Author
*Tel: +86-931-8912387. Fax: +86-931-8912582. E-mail:
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of wheat straw in slow-release fertilizer formulations with the function
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Dihydroxyl-methyl-urea with New Synthesis Method. Insulat. Mater.
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(21) Dessipri, E.; Minopoulou, E.; Chryssikos, G. D.; Gionis, V.;
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(23) Aouada, F. A.; de Moura, M. r. R.; Orts, W. J.; Mattoso, L. H. C.
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Funding
We gratefully acknowledge the financial support of the Special
Doctorial Program Fund of the Ministry of Education of China
(Grant No. 20090211110004) and Gansu Province Project of
Science and Technologies (Grant No. 0804WCGA130).
Notes
The authors declare no competing financial interest.
ABBREVIATIONS USED
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AA, acrylic acid; AMPS, 2-acryloylamino-2-methyl-1-propane-
sulfonic acid; APS, ammonium persulfate; CRF, controlled-
release fertilizer; DMU, N,N′-dimethylolurea; FTIR, Fourier
transform infrared; ICP, inductively coupled plasma;
NHMAAm, N-hydroxymethyl acrylamide; P(AA-AMPS-
NHMAAm), poly(acrylic acid-2-acryloylamino-2-methyl-1-pro-
panesulfonic acid-N-hydroxymethyl acrylamide); P(AA-AMPS-
NHMAAm)/WS, poly(acrylic acid-2-acryloylamino-2-methyl-
1-propanesulfonic acid-N-hydroxymethyl acrylamide)/wheat
straw; PDUP, poly(dimethylourea phosphate); WA, water
absorbency; WH, water-holding ratio; WR, water-retention
ratio; WS, wheat straw; XRD, X-ray diffractometer
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