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首页> 外文期刊>Journal of Applied Polymer Science >WATER-ABSORBING CHARACTERISTICS OF ACRYLIC ACID-GRAFTED CARBOXYMETHYL CELLULOSE SYNTHESIZED BY PHOTOGRAFTING
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WATER-ABSORBING CHARACTERISTICS OF ACRYLIC ACID-GRAFTED CARBOXYMETHYL CELLULOSE SYNTHESIZED BY PHOTOGRAFTING

机译：光接枝合成丙烯酸接枝羧甲基纤维素的吸水特性

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Cellulosic absorbents for mater were synthesized by photografting (lambda > 300 nm) acrylic acid (AA) onto fiberous carboxymethyl cellulose (CMC, degree of substitution [DS] = 0.1-0.4) at 30 degrees C in the presence of N,N-methylenebisacrylamide as a crosslinker. The CMC sample was pretreated with hydrogen peroxide in the presence of sulfuric acid to prepare CMC peroxides with a peracid type as a polymeric photoinitiator. The peroxides were active for the photografting and AA could be grafted onto CMC with percent graftings higher than 150% by photoirradiation of 10 min at 30 degrees C. The amount of water absorbed increased with increasing percent grafting of AA and DS of CMC. The amount was reduced considerably when the absorbents were prepared by the photografting of AA onto crosslinked CMC in the absence of the crosslinker. Graft copolymers which display a decreasing water absorbency as a function of temperature were prepared by two methods: In the first synthesis method, AA and N-isopropylacrylamide (NIPAAm) binary monomers were graft-copolymerized onto CMC samples using photoinitiation. In the second method, photografting of AA was followed by a second-step photografting of NIPAAm to produce a terpolymer with two types of side chains of differing repeat unit composition on the CMC substrate. Graft copolymers formed by both methods showed decreasing water absorbency as temperature increased with losses in water absorbency of up to about 60% as the temperature was increased above 30 degrees C. Effects of NIPAAm composition and crosslinker content in the graft copolymers on the decreasing water absorbency as a function of temperature were also examined. (C) 1996 John Wiley & Sons, Inc. [References: 15]
机译：在N，N-亚甲基双丙烯酰胺存在下，在30摄氏度下将丙烯酸（AA）接枝到纤维状羧甲基纤维素（CMC，取代度[DS] = 0.1-0.4）上，从而合成用于基质的纤维素吸收剂作为交联剂。在硫酸存在下，用过氧化氢对CMC样品进行预处理，以制备具有过酸类型的CMC过氧化物作为聚合光引发剂。过氧化物对光接枝具有活性，通过在30摄氏度下10分钟的光辐照，可以将AA接枝到CMC上，接枝率高于150％。随着AMC和CMC接枝率的增加，吸收的水量增加。当通过在不存在交联剂的情况下将AA光接枝到交联的CMC上来制备吸收剂时，该量显​​着降低。通过两种方法制备出吸水率随温度降低的接枝共聚物：在第一种合成方法中，使用光引发将AA和N-异丙基丙烯酰胺（NIPAAm）二元单体接枝共聚到CMC样品上。在第二种方法中，AA的光接枝之后是NIPAAm的第二步光接枝，以在CMC基板上生产具有两种类型重复单元组成不同的侧链的三元共聚物。两种方法形成的接枝共聚物均显示出随着温度的升高，吸水率降低，随着温度升高至30摄氏度以上，吸水率损失高达60％。接枝共聚物中NIPAAm组成和交联剂含量对吸水率下降的影响还考察了温度的函数。 （C）1996 John Wiley＆Sons，Inc. [参考：15]

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