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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and properties of PVA/PVP hydrogels containing chitosan by radiation
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Preparation and properties of PVA/PVP hydrogels containing chitosan by radiation

机译：含壳聚糖的PVA / PVP水凝胶的辐射制备及性能

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Radiation can induce chemical reactions to modify polymers even when they are in the solid state or at a low temperature. Radiation crosslinking can be easily adjusted by controlling the radiation dose and is reproducible. The finished product contains no residuals of substances required to initiate the chemical crosslinking, which can restrict its application possibilities. In these studies, hydrogels for wound dressing were made from a mixture of chitosan and polyvinyl alcohol (PVA)/poly-N-vinylpyrrolidone (PVP) by freezing and thawing, gamma-ray irradiation, or combined freezing and thawing and gamma-ray irradiation. The physical properties of the hydrogel, such as gelation, water absorptivity, and gel strength, were examined to evaluate the usefulness of the hydrogels for wound dressing. The PVA/PVP composition was 60:40, PVA/PVP-chitosan ratio was in the range 9:1-7:3, and the concentration of, PVA/PVP-chitosan as a solid was 15 wt %. A mixture of PVA/PVP-chitosan was exposed to gamma irradiation doses of 25, 35, 50, 60 and 70 kGy to evaluate the effect of irradiation dose on the physical properties of hydrogels. Water-soluble chitosan was used in these experiment. The physical properties of the hydrogels, such as gelation and gel strength, were higher when the combination of freezing and thawing and irradiation were used rather than just freezing and thawing. The PVA/PVP-chitosan composition and irradiation dose had a greater influence on swelling than gel content, Swelling percent increased as the composition of chitosan in PVA/PVP-chitosan increased. (C) 2002 Wiley Periodicals, Inc. [References: 12]
机译：辐射即使在固态或低温下也可以诱导化学反应来修饰聚合物。辐射交联可通过控制辐射剂量轻松调节，并且可重现。成品不含引发化学交联所需的任何残留物质，这会限制其应用可能性。在这些研究中，用于伤口敷料的水凝胶是由壳聚糖和聚乙烯醇（PVA）/聚-N-乙烯基吡咯烷酮（PVP）的混合物通过冷冻和融化，伽马射线辐照，或将冷冻和融化与伽马射线辐照结合制成的。检查了水凝胶的物理性质，例如凝胶化，吸水率和凝胶强度，以评估水凝胶用于伤口敷料的有用性。 PVA / PVP组成为60：40，PVA / PVP-壳聚糖的比例为9：1-7：3，并且作为固体的PVA / PVP-壳聚糖的浓度为15重量％。将PVA / PVP-壳聚糖的混合物暴露于25、35、50、60和70 kGy的伽马辐照剂量下，以评估辐照剂量对水凝胶物理性质的影响。在这些实验中使用水溶性壳聚糖。当使用冷冻和解​​冻以及辐射的组合而不是仅仅冷冻和解冻时，水凝胶的物理性质，例如凝胶化和凝胶强度，更高。 PVA / PVP-壳聚糖的组成和辐照剂量对溶胀的影响大于凝胶含量，溶胀百分率随PVA / PVP-壳聚糖中壳聚糖组成的增加而增加。 （C）2002 Wiley Periodicals，Inc. [参考：12]

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