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首页> 外文期刊>Journal of Applied Polymer Science >Characlerization of cellulose microbeads prepared by a viscose-phase-separation method and their chemical modification with acid anhydride
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Characlerization of cellulose microbeads prepared by a viscose-phase-separation method and their chemical modification with acid anhydride

机译：粘胶相分离法制备纤维素微珠的表征及其酸酐的化学修饰

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摘要

Chemically modified cellulose microbeads are useful as cosmetic materials. Cellulose microbeads as supports, prepared by a viscose-phase-separation method, are monodisperse and spherical. However, cellulose shows only slight hydrophilicity, even though it has three hydroxyl groups per pyranose ring, because cellulose possesses high crystallinity on account of the cellulose II structure derived from hydrogen bonds among the hydroxyl groups. To increase the hygroscopicity of cellulose microbeads, we have carboxylatec them with succinic and glutaric anhydrides. Their hygroscopicity increases with the addition of succinoyl and glutaroyl groups. Moreover, we have confirmed the increased hygroscopicity of microbeads with sodium salinization. We have investigated the decomposition of these hydrophilic cellulose microbeads in aqueous buffer solutions and have confirmed that succinoylated cellulose is more readily decomposed than glutaroylated cellulose microbeads in aqueous solutions. On the other hand, to increase the lipophilicity of cellulose microbeads, we have acylated them with acetic and hexanoic anhydrides. Hydrophobizing microbeads with hexanoyl groups provides an affinity to benzene but not to H2O. In contrast, hydrophobizing with acetyl groups provides affinity not only to benzene but also to H2O. © 2005 Wiley Periodicals, Inc.
机译：化学改性的纤维素微珠可用作化妆品材料。通过粘胶相分离法制备的纤维素微珠作为载体是单分散的和球形的。但是，即使每个吡喃糖环具有三个羟基，纤维素也仅显示出微弱的亲水性，因为由于源自羟基之间氢键的纤维素II结构，纤维素具有高结晶度。为了增加纤维素微珠的吸湿性，我们将其与琥珀酸酐和戊二酸酐羧酸酯化。它们的吸湿性随琥珀酰基和戊二酰基的增加而增加。此外，我们已经证实，钠盐化会增加微珠的吸湿性。我们已经研究了这些亲水性纤维素微珠在水性缓冲溶液中的分解，并证实了琥珀酰化纤维素比在水溶液中的戊二酰化纤维素微珠更容易分解。另一方面，为了增加纤维素微珠的亲脂性，我们用乙酸酐和己酸酐将它们酰化。具有己酰基的疏水化微珠可提供对苯的亲和力，但不提供对H2O的亲和力。相反，用乙酰基疏水化不仅提供了对苯的亲和力，而且还提供了对H2O的亲和力。 ＆复制; 2005 Wiley期刊公司

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