• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Control of PDMS crosslinking by encapsulating a hydride crosslinker in a PMMA microcapsule
【24h】

Control of PDMS crosslinking by encapsulating a hydride crosslinker in a PMMA microcapsule

机译：通过将氢化物交联剂封装在PMMA微胶囊中来控制PDMS交联

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

In the preparation of PDMS elastomers, a combination of mixing and reactive processes constrains the applicability of the PDMS elastomer in research and applications. Separation of the mixing and reactive processes, which control PDMS crosslinking, has been achieved by encapsulating a hydride crosslinker in a PMMA shell. Microcapsules are mixed with vinyl-terminated PDMS to create a gelation system, which allows for storage at 50 degrees C, without premature gelation, and in addition allows for extensive crosslinking reaction at 120 degrees C. Both visual observations and rheological studies show that a robust PDMS elastomer is obtained upon heating the gelation system. Furthermore, the influence of stoichiometric imbalance on the equilibrium storage modulus of the PDMS network is investigated, by employing different amounts of microcapsules in vinyl-terminated PDMS. It has been found that adding microcapsules increases the equilibrium storage modulus of the PDMS elastomer until the diffusion of the hydride crosslinker is constricted. An optimum amount of crosslinker used in the control crosslinking reaction has also been found. However, compared to the pure PDMS elastomer, the modulus of the PDMS elastomer from the encapsulated system is less sensitive in relation to the stoichiometry of the system than the corresponding polymer network. This broadens the applicability range of silicone elastomers.
机译：在制备PDMS弹性体时，混合和反应过程的结合限制了PDMS弹性体在研究和应用中的适用性。通过将氢化物交联剂封装在PMMA壳中，可以实现控制PDMS交联的混合过程和反应过程的分离。将微胶囊与乙烯基封端的PDMS混合以形成凝胶化系统，该系统可在50摄氏度下储存，而不会过早发生凝胶化，此外还允许在120摄氏度下进行广泛的交联反应。目视观察和流变学研究均显示出坚固通过加热胶凝体系获得PDMS弹性体。此外，通过在乙烯基封端的PDMS中使用不同数量的微胶囊，研究了化学计量失衡对PDMS网络的平衡储能模量的影响。已经发现，添加微胶囊会增加PDMS弹性体的平衡储能模量，直到氢化物交联剂的扩散受到限制。还发现在控制交联反应中使用的最佳交联剂量。然而，与纯PDMS弹性体相比，来自包封系统的PDMS弹性体的模量相对于系统的化学计量不如对应的聚合物网络敏感。这拓宽了有机硅弹性体的适用范围。

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