• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Novel biodegradable adaptive hydrogels: Controlled synthesis and full characterization of the amphiphilic co-networks
【24h】

Novel biodegradable adaptive hydrogels: Controlled synthesis and full characterization of the amphiphilic co-networks

机译：新型可生物降解的自适应水凝胶：两亲性共网络的受控合成和完整表征

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

Adaptive and amphiphilic poly(N,N-dimethylamino-2-ethyl methacrylate-graft-poly[epsilon-caprolactone]) co-networks (netP(DMAEMA-g-PCL)) were synthesized from a combination of controlled polymerization techniques. Firstly, PCL cross-linkers were produced by ring-opening polymerization (ROP) of epsilon-CL initiated by 1,4-butane-diol and catalyzed by tin(11) 2-ethylhexanoate ([Sn(Oct)(2)]), followed by the quantitative esterification reaction of terminal hydroxyl end-groups with methacrylic anhydride. Then, PCL cross-linkers were copolymerized to DMAEMA monomers by atom-transfer radical polymerization (ATRP) in THF at 60 degrees C using CuBr complexed by 1,1,4,7,10,10-hexamethyltriethylenetetramine (HMTETA) and 2-ethyl isobutyryl-bromide (EiBBr) as catalytic complex and initiator, respectively. A comprehensive study of gel formation was carried out by employing dynamic light scattering (DLS) to determine the gel point as a function of several parameters and to characterize the viscous solutions obtained before the gel point was reached. The evolution of the mean diameters was compared to a model previously developed by Fukuda and these attest to the living formation of the polymer co-network. Furthermore, we also demonstrated the reliability of ATRP for producing well-defined and homogeneous polymer co-networks by the smaller deviation from Flory's theory in terms of cross-linking density. For sake of clarity, the impact of polymerization techniques over the final structure and, therefore, properties was highlighted by comparing two samples of similar composition, but that were produced by either ATRP or thermal-initiated free-radical polymerization (FRP).
机译：自适应和两亲性聚（N，N-二甲基氨基-2-乙基甲基丙烯酸甲酯-接枝-聚ε-己内酯）共网络（netP（DMAEMA-g-PCL））是通过控制聚合技术的组合合成的。首先，PCL交联剂是由ε-CL的开环聚合（ROP）制备的，该环由1,4-丁二醇引发并由2-乙基己酸锡（11）（[Sn（Oct）（2）]）催化，然后进行末端羟基端基与甲基丙烯酸酐的定量酯化反应。然后，将PCL交联剂通过在60℃下于THF中进行原子转移自由基聚合（ATRP），使用与1,1,4,7,10,10-六甲基三亚乙基四胺（HMTETA）和2-乙基络合的CuBr，将其与DMAEMA单体共聚。异丁酰溴（EiBBr）分别作为催化络合物和引发剂。通过使用动态光散射（DLS）来确定凝胶点与多个参数的关系，并对在达到凝胶点之前获得的粘性溶液进行表征，从而对凝胶形成进行了全面的研究。将平均直径的演变与由Fukuda先前开发的模型进行比较，这些证明了聚合物共网络的活跃形成。此外，通过在交联密度方面偏离弗洛里理论的较小偏差，我们还证明了ATRP产生定义明确且均质的聚合物共网络的可靠性。为清楚起见，聚合技术对最终结构的影响以及因此对性能的影响通过比较两个相似组成的样品来突出显示，这些样品是通过ATRP或热引发的自由基聚合（FRP）制备的。

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