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首页> 外文期刊>Journal of Applied Polymer Science >Determination of green-bond strength in tacky poly(vinyl alcohol) hydrogels
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Determination of green-bond strength in tacky poly(vinyl alcohol) hydrogels

机译：粘性聚乙烯醇水凝胶中生胶强度的测定

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Pressure-sensitive tack is the adhesive property related to bond formation. It is a key issue when formulating hydrogel poultices for transdermal delivery, dressings, and bioelectrodes. Quantitative tack gives an indication of the potential ease and success of application when gels are brought into contact with skin. The effects of different dwell times and constant pressures on bond formation between tacky poly(vinyl alcohol) (PVA) hydrogels and a skin model were explored in the current study; these were correlated with viscoelastic properties in order to elucidate structure-function relationships. A rolling tack test was performed using a novel apparatus capable of simultaneously controlling the pressure and dwell time in a hydrogel/skin-model-probe system. PVA gels were formed via the freeze-thaw technique using Ca2+ ions. Lower calcium availability in PVA gels resulted in longer dwell times required to complete bond formation, decreased. creep compliance (at 0.01 s) and a decreased G'((omega=40))/G'((omega =0.01)) ratio, all three leading to a loss in tack strength. All tested gels were found to have pressure-sensitive tack. The results of this study support the applicability of a rheological methodology and a novel tack-testing procedure to quantify green-bond formation in pressure-sensitive-adhesive PVA hydrogels. (C) 2003 Wiley Periodicals, Inc. [References: 19]
机译：压敏粘性是与粘合形成有关的粘合性能。当配制用于透皮递送，敷料和生物电极的水凝胶糊剂时，这是关键问题。当凝胶与皮肤接触时，定量粘性表明其潜在的易用性和成功应用。本研究探讨了不同的保压时间和恒定压力对粘性聚乙烯醇（PVA）水凝胶与皮肤模型之间键形成的影响。为了阐明结构与功能的关系，将它们与粘弹性进行关联。使用能够同时控制水凝胶/皮肤模型探针系统中的压力和停留时间的新型装置进行粘性滚动测试。通过使用Ca 2+离子的冻融技术形成PVA凝胶。 PVA凝胶中钙的利用率较低，导致完成键形成所需的更长的停留时间减少了。蠕变柔韧性（在0.01 s时）和降低的G'（（ω= 40））/ G'（（ω= 0.01））比，这三者均导致粘结强度降低。发现所有测试的凝胶均具有压敏粘性。这项研究的结果支持流变学方法和一种新颖的粘性测试程序的适用性，以量化压敏胶粘PVA水凝胶中的绿色键形成。 （C）2003 Wiley Periodicals，Inc. [参考：19]

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