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首页> 外文学位 >Fabrication of microcellular ceramics from polysiloxane-polyolefin blends by using polymer foaming technology.
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Fabrication of microcellular ceramics from polysiloxane-polyolefin blends by using polymer foaming technology.

机译：使用聚合物发泡技术由聚硅氧烷-聚烯烃共混物制造微孔陶瓷。

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摘要

Recent investigations in porous ceramics have remarkably increased due to the rapidly growing interests of porous ceramics as filters, catalyst supports, burners, gas diffusers and biomaterial for bone replacement. Since the distribution of size and shape of the pore space in porous ceramics directly relates to their ability to perform a desired function in a particular application, the need to establish uniformity of the cell size and shape in order to achieve superior part properties, has been strongly emphasized. Consequently, efficient manufacturing technologies for quality porous ceramics are in demand.;By controlling the viscosity of the polyolefin phase, polyolefin polymer content, compounding and foaming parameters, the polysiloxane-polyolefin foam morphology can be varied. Furthermore, with a deliberate control of the content and dispersion of polyolefin polymer, open-channels can be induced into the cell walls by burning out the sacrificial polyolefin phase at elevated temperatures; consequently, the open-cell content of porous ceramics can be adjusted. Gradient microcellular ceramics with continuously changed cell size and porosity have also been fabricated by using a laminating method. Furthermore, multi-phased microcellular ceramics are fabricated by adding selectable filler material into the staring blends of polysiloxane and polyolefin, followed by foaming and pyrolysis.;Our recent study demonstrated that an extremely fine and uniformly distributed microcellular structure could be developed from the blends of polysiloxane preceramic polymer and thermoplastic polymer. The following stages are involved in the research: (i) characterizing and modifying the rheological properties of polysiloxane preceramic polymer, (ii) foaming and shaping a mixture of polysiloxane, polyolefin polymer, and blowing agents by using a conventional polymer compounding and foaming method, (iii) cross-linking the foamed body, and (iv) transforming the foamed body into ceramic foams by pyrolysis.
机译：由于多孔陶瓷作为过滤器，催化剂载体，燃烧器，气体扩散器和用于骨置换的生物材料的迅速增长的兴趣，最近对多孔陶瓷的研究显着增加。由于多孔陶瓷中孔隙空间的大小和形状的分布直接关系到它们在特定应用中执行所需功能的能力，因此需要建立孔大小和形状的均匀性以实现优异的零件性能。强烈强调。因此，需要用于高质量多孔陶瓷的有效制造技术。通过控制聚烯烃相的粘度，聚烯烃聚合物的含量，配合和发泡参数，可以改变聚硅氧烷-聚烯烃的泡沫形态。此外，在有意控制聚烯烃聚合物的含量和分散性的情况下，可以通过在高温下烧掉牺牲性聚烯烃相来在细胞壁中诱导开路。因此，可以调节多孔陶瓷的开孔含量。还已经通过使用层压方法制造了具有连续变化的孔尺寸和孔隙率的梯度微孔陶瓷。此外，通过在聚硅氧烷和聚烯烃的凝视共混物中添加可选的填充材料，然后进行发泡和热解来制造多相微孔陶瓷;我们的最新研究表明，从以下混合物中可以开发出极细且均匀分布的微孔结构聚硅氧烷陶瓷和热塑性聚合物。研究涉及以下阶段：（i）表征和改变聚硅氧烷预陶瓷聚合物的流变性能，（ii）使用常规的聚合物配混和发泡方法使聚硅氧烷，聚烯烃聚合物和发泡剂的混合物发泡并成型， （iii）使泡沫体交联，和（iv）通过热解将泡沫体转变成陶瓷泡沫。

著录项

  • 作者

    Wang, Chunmin.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 194 p.
  • 总页数 194
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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