聚氨酯

Abstract(#br)Poly(dimethylsiloxane–urethane) (PDMS–PU) nanocomposite membranes with various concentrations of polyhedral oligomeric silsesquioxanes (POSS) were synthesised and the influence of POSS molecules on gas transport properties was studied. In this, two different types of POSS nanoparticles such as CyPOSS and POSS-H were incorporated and their effect on permeation properties was studied. Nanocomposite membranes were characterized using DSC, AFM, XRD and contact angle measurements.

Abstract(#br)Periodontal disease if left untreated can result in creation of defects within the alveolar ridge. Barrier membranes are frequently used with or without bone replacement graft materials for achieving periodontal guided tissue regeneration (GTR). Surface properties of barrier membranes play a vital role in their functionality and clinical success. In this study polyetherurethane (PEU) membranes were synthesized by using 4,4′-methylene-diphenyl diisocyanate (MDI), polytetramethylene oxide (PTMO) and 1,4-butane diol (BDO) as a chain extender via solution polymerization.

Abstract(#br)Atomic layer deposition (ALD) surges as an attractive technology to deposit thin films on different substrates for many advanced biomedical applications. Herein titanium dioxide (TiO 2 ) thin films were successful obtained on polyurethane (PU) and polydimethylsiloxane (PDMS) substrates using ALD. The effect of TiO 2 films on Candida albicans growth and inactivation process were also systematic discussed. TiCl 4 and H 2 O were used as precursors at 80\u003cce:hsp sp=\"0.25\"/\u003e°C, while the reaction cycle number ranged from 500 to 2000.

Abstract\n\t\t\t\t\n\t\t\t\t\tHydroxy-terminated polydimethylsiloxane (PDMS) was incorporated into the soft segments of UV-curable polycarbonate-based polyurethane (meth)acrylate dispersions to improve the thermal property and surface property. 2-Hydroxymethacylate or pentaerythritol tri-acrylate was end-capped with or without PDMS to confirm the effect of the functionality of the end-capping group on the properties. Owing to the hydrophobicity of siloxane, the cured coating films containing PDMS had low surface free energy, and higher thermal degradation temperature.

表面生物膜和血栓形成在全球范围内造成了显著的发病率和死亡率，这突出了开发有效的防污染方法的重要性。本工作采用简单的两步浸涂法制备了具有优异的多液体斥力、杀菌性能和极低的细菌和血液附着力的新型高鲁棒性超疏水涂层。将1H、1H、2H、2H-全氟辛基三乙氧基硅烷( FAS-17 )包复的疏水性氧化锌和铜纳米粒子复合制备涂层，在商用聚氨酯( PU )海绵上构建分级微/纳米结构，然后进行聚二甲基硅氧烷( PDMS )处理，用于提高纳米粒子与海绵表面的结合程度。微/纳米织构的样品可以排斥各种液体，包括水、牛奶、咖啡、果汁和血液。与原PU相比，在连续滴流生物反应器中，制备的海绵超疏水特性使细菌(金黄色葡萄球菌)的粘附性在4天内显著降低，最高可达99.9 %。海绵对纤维蛋白原和活化血小板的粘附也有很强的抵抗力，分别降低76 %和64 %，从而降低凝血和血栓形成的风险。更为重要的是，海绵即使在受到不同类型的严酷机械损伤后，如手指划伤、刀划伤、胶带剥伤、手捏伤、手搓伤、弯曲伤、压缩释放( 1000个循环)试验，以及在250g装载量下1000cm砂纸擦伤，也能保持其超疏水性能。因此，该新型杂化表面具有较强的鲁棒性和抗血液粘附和细菌污染的能力，使其成为多种应用领域的理想选择。

柔顺应变计是可穿戴应用的关键器件，如人体健康传感器系统、外骨骼或机器人等。除了传统的压阻材料，如放置在应变敏感微系统上的金属和掺杂半导体，一类具有奇异力学性能的软多孔材料，称为辅助材料，可以用于应变片，以提高其性能并增加功能。对于应变电子读出，它们的聚合物结构需要导电。本文介绍了一种基于聚合物纳米复合材料的辅助电极的制备工艺。在开孔聚氨酯( PU )辅助泡沫上制备了多壁碳纳米管/聚二甲基硅氧烷( MWCNT / PDMS )，并评估了其作为应变传感器电极的有效可用性。

柔顺应变计是可穿戴应用的关键器件，如人体健康传感器系统、外骨骼或机器人等。除了传统的压阻材料，如放置在应变敏感微系统上的金属和掺杂半导体，一类具有奇异力学性能的软多孔材料，称为辅助材料，可以用于应变片，以提高其性能并增加功能。对于应变电子读出，它们的聚合物结构需要导电。本文介绍了一种基于聚合物纳米复合材料的辅助电极的制备工艺。在开孔聚氨酯( PU )辅助泡沫上制备了多壁碳纳米管/聚二甲基硅氧烷( MWCNT / PDMS )，并评估了其作为应变传感器电极的有效可用性。