• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Controlled preparation of physically crosslinked chitosan-g-poly(vinyl alcohol) hydrogel
【24h】

Controlled preparation of physically crosslinked chitosan-g-poly(vinyl alcohol) hydrogel

机译：物理交联的壳聚糖-g-聚乙烯醇水凝胶的可控制备

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Physically crosslinked chitosan-g-poly(vinyl alcohol) hydrogels with controllable graft percent were prepared in three steps. Poly(vinyl acetate) (PVAc) was first grafted onto chitosan via radical copolymerization. Then the copolymer was converted into chitosan-g-poly(vinyl alcohol) by alcoholysis reaction. The graft percent of poly (vinyl alcohol) (PVA) could be tailored by the reaction conditions such as the solvent composition, the concentration of initiator and the amount of monomer added. Finally, Chitosan-g-PVA hydrogels were formed by freezing-thawing cycles. The structure of graft copolymers was verified with FTIR. Both XRD analysis and contact angle test showed that the difference of crystallinity and hydrophilicity among chito-san, chitosan-g-PVAc and chitosan-g-PVA was evident. It was found that the maximum swelling ratios of chitosan-g-PVA hydrogels containing 37.6% and 46.2% PVA were 3.48 ± 0.11 and 4.40 ± 0.14 at pH 1.2, 1.90 ± 0.13 and 2.80 ± 0.15 at pH 7.4, respectively. This suggested the hydrogel was pH-sensitive, and its swelling behavior could be tailored with the graft percent of PVA.
机译：分三步制备具有可控制接枝率的物理交联的壳聚糖-g-聚乙烯醇水凝胶。首先通过自由基共聚将聚乙酸乙烯酯（PVAc）接枝到壳聚糖上。然后通过醇解反应将共聚物转化为壳聚糖-g-聚乙烯醇。聚乙烯醇（PVA）的接枝百分比可以通过反应条件来调整，例如溶剂组成，引发剂浓度和单体添加量。最后，通过冻融循环形成了壳聚糖-g-PVA水凝胶。 FTIR验证了接枝共聚物的结构。 XRD分析和接触角测试均表明，壳聚糖，壳聚糖-g-PVAc和壳聚糖-g-PVA的结晶度和亲水性差异明显。发现含有37.6％和46.2％PVA的壳聚糖-g-PVA水凝胶的最大溶胀率在pH 1.2下分别为3.48±0.11和4.40±0.14，在pH 7.4下分别为1.90±0.13和2.80±0.15。这表明水凝胶对pH敏感，其膨胀行为可以通过PVA的接枝百分比来调整。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号