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- Title
Synthesis and Swelling Behavior of Super‐Absorbent Soluble Starch‐g‐poly(AM‐co‐NaAMC<sub>14</sub>S) Through Graft Copolymerization and Hydrolysis.
- Authors
Lan, Guihong; Zhang, Ming; Liu, Yongqiang; Qiu, Haiyan; Xue, Songsong; Zhang, Tailiang; Xu, Qianxia
- Abstract
By introducing sodium 2‐acrylamido‐tetradecanesulfonate (NaAMC14S) to graft copolymerization of soluble starch and acrylamide (AM), a novel super absorbent resin (SAR) of soluble starch‐g‐poly(AM‐co‐NaAMC14S) (SR‐14) is synthesized. Polymer gels are hydrolyzed with sodium hydroxide (NaOH) to convert the function group −CONH2 to −COO‐. The structures and qualitative changes of the polymer gels are characterized through Fourier transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), elemental analysis, and rheometer. Results show the polymer gels through the hydrolysis by NaOH increased the water absorbency of the final SR‐14 resin from 31.71 to 1183.43 g g−1 as the degree of hydrolysis (DH) increased from 0 to 80%. Drastic increases in the storage and loss modulus of SR‐14 reflected the intensive molecular structural changes induced by the addition of NaAMC14S. The changes in the molecular structures of SR‐14 can be attributed to hydrophobic associations among long‐chain alkane. Soluble starch‐g‐poly(AM‐co‐NaAMC14S) exhibits the maximum water absorbency of 2536.77 g g−1 in distilled water and 92.98 g g−1 in 0.9 wt.% NaCl solution. In the absence of NaAMC14S, however, the water absorbency of soluble starch‐g‐poly(AM) decreases to 1222.27 g g−1 in distilled water and to 62.29 g g−1 in 0.9 wt.% NaCl solution. Results indicate that NaAMC14S has potential applications as a material that can enhance the water absorbency of SAR.
- Subjects
POLYMER colloids; FOURIER transform infrared spectroscopy; MOLECULAR structure; COPOLYMERIZATION; DISTILLED water; SURFACE grafting (Polymer chemistry)
- Publication
Starch / Staerke, 2019, Vol 71, Issue 5/6, pN.PAG
- ISSN
0038-9056
- Publication type
Article
- DOI
10.1002/star.201800272