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| SAP, can be classified into two types depending on their raw material source. Polymerized resins that are based on petrochemical products such as acrylic acid, acrylamide, polyvinyl alcohol, and acrylonitrile. This type has better water absorbency, but has poorer penetration performance, is more expensive and is nonbiodegradable. The biodegradable resins that are synthesized from natural polymers such as starch, cellulose, chitosan are the second type of SAP. Although this type is biodegradable, their water absorption and retention performance are poorer. Therefore, the preparation of SAP with super water absorbency, excellent machinery performance, and low cost through the modification of natural polymers by copolymerization is a popular area of research (Chang, Duan, Cai, & Zhang, 2010; Buchholz, 1996). |
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haizhoubuer: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 太棒啦! 2014-11-04 09:31:24
haizhoubuer: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 太棒啦! 2014-11-04 09:31:24
| 根据其原料来源,可以将SAP分为两种类型。聚合树脂是基于丙烯酸,丙烯酰胺,聚乙烯醇,丙烯腈等石化产品。这种类型具有更好的吸水性能,但具有较差的渗透性能,更昂贵且是不可生物降解的。第二类型的SAP是可以生物降解的,由淀粉,纤维素,脱乙酰壳多糖等天然聚合物合成。虽然这种类型是可生物降解的,但它们的水吸收性和保水性能都较差。因此,通过对天然聚合物的共聚改性,以获得具有超强的吸水性,优异的机械性能,而且成本低的SAP,是本研究领域的热点(Chang, Duan, Cai, & Zhang, 2010; Buchholz, 1996)。 |
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