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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization by radiation of hydrogels of PVA and PVP containing Aloe vera
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Preparation and characterization by radiation of hydrogels of PVA and PVP containing Aloe vera

机译：含芦荟的PVA和PVP水凝胶的辐射制备与表征

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摘要

In these studies, hydrogels for wound dressing were made from a mixture of Aloe vera, poly(vinyl alcohol) (PVA) and poly(N-vinylpyrrolidone) (PVP) by freeze-thaw, gamma-ray irradiation, or a two-step process of freeze-thaw and gamma-ray irradiation. Physical properties, such as gelation, water absorptivity, gel strength and degree of water evaporation were examined to evaluate the applicability of these hydrogels to wound dressing. The PVA:PVP ratio was 6:4, and the dry weight of Aloe vera was in the range of 0.4-1.2 wt%. The solid concentration of PVA/PVP/ Aloe vera solution was 15 wt%. NExtures of PVA/PVP/Aloe vera were exposed to gamma irradiation doses of 25, 35 and 50 kGy to evaluate the effect of irradiation dose on the physical properties of the hydrogels. Gel content and gel strength increased as the concentration of Aloe vera in PVA/ PVP/Aloe vera decreased and as irradiation dose increased and freeze-thaw was repeated. Swelling degree was inversely proportional to gel content and gel strength. (C) 2003 Wiley Periodicals, Inc. [References: 10]
机译：在这些研究中，用于伤口敷料的水凝胶由芦荟，聚乙烯醇（PVA）和聚（N-乙烯基吡咯烷酮）（PVP）的混合物通过冻融，γ射线辐照或两步法制得融化和伽马射线照射的过程。检查了诸如凝胶化，吸水率，凝胶强度和水蒸发程度的物理性质，以评估这些水凝胶对伤口敷料的适用性。 PVA∶PVP比率为6∶4，并且芦荟的干重在0.4-1.2重量％的范围内。 PVA / PVP /芦荟溶液的固体浓度为15重量％。将PVA / PVP /芦荟的NExture暴露于25、35和50 kGy的γ辐照剂量下，以评估辐照剂量对水凝胶物理性质的影响。凝胶含量和凝胶强度随着PVA / PVP /芦荟中芦荟浓度的降低和辐照剂量的增加而增加，并重复冻融。溶胀度与凝胶含量和凝胶强度成反比。 （C）2003 Wiley Periodicals，Inc. [参考：10]

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