聚二甲基硅氧烷

摘要\n功能梯度材料( FGMs )具有不同的空间、化学和机械梯度(连续或逐步)，具有模拟跨越生物组织发现的异质特性的潜力。它们可以防止应激集中，保持健康的细胞功能。这里，我们首次展示了聚二甲基硅氧烷和聚醚醚酮( PDMS- PEEK )复合材料的制备。这些材料成功地作为一种散体材料和功能梯度(逐步)制造，无需使用危险溶剂或需要添加剂。在没有形成硬的、边界界面的情况下，实现了层间(对于FGMs )的化学不可逆粘合。PDMS- PEEK FGMs的力学性能被证明可以在整个构建体积中进一步裁剪，模拟从软到硬组织的转变。在PDMS基体中引入20 wt % PEEK颗粒后，拉伸和压缩载荷下的弹性模量显著提高。生物和热筛选表明，这些复合材料对人成纤维细胞细胞株无不良影响，能在体温下保留物理状态和质量，可使复合材料适用于颌面部假体、人工血管和关节软骨置换等一系列生物医学应用。

摘要 本论文研究了石墨烯纳米片( GNP )与双链DNA的纳米复合材料作为紫外光敏材料，由于其具有良好的电学性能，同时结合DNA对紫外光的化学敏感性，特别是对能量较高的UV-C波段。在柔性聚二甲基硅氧烷( PDMS )基体中嵌入石墨烯-DNA填料，采用滴注法制备纳米复合膜。由于纳米复合材料的传感性能受填料分散量和均匀性的影响较大，为了提高石墨烯- DNA元素在聚合物基体中的分散性，对其合成工艺进行了优化。采用互补技术研究了GNP-DNA / PDMS薄膜在UV-C辐射前后的电学、热学性能以及表面形貌和润湿性。研究结果揭示了这些新型功能纳米复合材料在高致命紫外辐射环境中的潜在应用。

摘要\n我们采用电感耦合C4F8 / O2 / Ar混合气体等离子体对聚二甲基硅氧烷( PDMS )薄膜进行等离子体处理，以改性其表面性能。我们考察了等离子体特性与PDMS表面变化的关系，以期了解表面改性机理。通过表面能测量、原子力显微镜( AFM )和X射线光电子能谱( XPS )对PDMS薄膜的表面特性进行了详细的评价，通过接触角测量证实了等离子体处理PDMS薄膜的表面、极性和色散能随着O2气体比例的增加而增加。AFM分析表明，等离子体处理的PDMS表面粗糙度随O2气体比例的增加而增加。XPS分析证实了富C4F8等离子体中存在一个官能团CFx ( X = 1，2，3 )，富O2等离子体中存在一个官能团OH。证实可以通过控制C4F8 / O2 / Ar等离子体处理参数来控制PDMS薄膜的表面能，而在每个表面能不同的材料中应用直接转移技术所需的参数。

Abstract(#br)The ongoing conflict against terrorism has resulted in an escalation of blast-induced traumatic brain injuries (bTBI) caused by improvised explosive devices (IEDs). The destructive IEDs create a blast wave that travels through the atmosphere. Blast-induced traumatic brain injuries, attributed to the blast wave, can cause life-threatening injuries and fatalities. This study aims to find a surrogate brain material for assessing the effectiveness of head protection systems designed to mitigate bTBI. Polydimethylsiloxane (PDMS) is considered as the surrogate brain material.

Abstract(#br)High separation performance and superior mechanical properties of the membranes are both of critical importance for membrane modules to achieve high efficiency and long-term stability. Herein, a series of mixed matrix membranes (MMMs) with brick-and-mortar architecture are prepared by incorporating two-dimensional zeolitic imidazolate framework-L (ZIF-L) nanosheets into polydimethylsiloxane (PDMS) matrix for separating alcohols (ethanol, n -propanol or n -butanol) from aqueous solution.

Abstract(#br)Surface modified porous polysulfone (PSF) hollow fiber membrane was prepared by dip-coating of polydimethylsiloxane (PDMS). The prepared membranes were used in an air gap membrane distillation (AGMD) process for dehydration of MEG-water mixtures. The membranes were characterized in terms of Field Emission Scanning Electronic Microscopy (FESEM), N 2 permeation, contact angle measurement and wetting pressure. From FESEM images, the prepared membrane showed a porous structure with finger-like cavities.

Abstract(#br)This report demonstrates the fabrication of a composite hollow fiber membrane that efficiently recovers dissolved methane (dCH 4 ) from anaerobic wastewater treatment effluents via membrane contactor (MC) process. We first fabricated highly porous hollow fiber membranes (∼85% porosity) using polyvinylidene difluoride (PVDF). Then, we coated the whole structure (bulk), or lumen side of PVDF supports with polydimethylsiloxane (PDMS), a hydrophobic polymer possessing high gas permeability.

Abstract(#br)Surface wettability of gas diffusion media (GDM) is one of the key issues related to the water management in fuel cells. In this study, a facile coating approach of combining carbon black and polydimethylsiloxane (PDMS) is developed to fabricate the gas diffusion layer (GDL) with super hydrophobic and hierarchical surfaces. Due to the Wenzel and Cassie's effect, the fabricated GDL shows the average contact angle as high as 158° and the roll angle less than 5°.

Abstract(#br)Oil spill accidents and industrial oily wastewater are threatening all living species in the ecological system. Development of materials with special wettability for oil/water separation has been the subject of many researches. Herein, superhydrophobic and superoelophilic nanocomposite coatings, based on titanium dioxide (TiO 2 ) nanoparticles and polydimethylsiloxane (PDMS), were applied on metal meshes with different pore sizes (25 and 100 μm). Morphological analysis revealed that adding PDMS, as a binder, significantly changes the surface structure of the coatings.

摘要\n聚合物在生物材料方面的应用越来越引起人们的兴趣。研究人员一直在尝试将金属氧化物或金属纳入聚合物中，以获得显著提高所得到聚合物材料的理想性能，如导电性和抗菌活性。这类材料的一个很有前途的技术是原子层沉积( ALD )。通过沉积一层非常薄的金属或金属氧化物薄膜，人们可以在不损失聚合物独特的本体性能的前提下利用这些材料的特性，然而，由于表面和亚表面薄膜的生长，这种材料在聚合物上的沉积在一定程度上变得困难。\n本研究在O2等离子体处理和非等离子体处理的PDMS上，研究了TiO2在聚二甲基硅氧烷( PDMS )上成核和生长初期的原子层沉积( ALD )，采用X射线近边结构吸收、扫描电子显微镜/能量色散X射线能谱和X射线光电子能谱对材料进行表征。结果表明，等离子体处理的PDMS表面发生了类ALD的TiO2表面生长，对于非等离子体处理的原始PDMS，TiO2在聚合物亚表面得到了明显的有利扩散/浸润，至少前25个ALD循环没有明显的外表面沉积。