Self‐Healing,Adhesive, and Highly Stretchable Ionogel as a Strain Sensor for Extremely Large Deformation

Fabricating a strain sensor that can detect large deformation over a curved object with a high sensitivity is crucial in wearable electronics, human/machine interfaces, and soft robotics. Herein, an ionogel nanocomposite is presented for this purpose. Tuning the composition of the ionogel nanocomposites allows the attainment of the best features, such as excellent self‐healing (>95% healing efficiency), strong adhesion (347.3 N m^?1), high stretchability (2000%), and more than ten times change in resistance under stretching. Furthermore, the ionogel nanocomposite–based sensor exhibits good reliability and excellent durability after 500 cycles, as well as a large gauge factor of 20 when it is stretched under a strain of 800–1400%. Moreover, the nanocomposite can self‐heal under arduous conditions, such as a temperature as low as ?20 °C and a temperature as high as 60 °C. All these merits are achieved mainly due to the integration of dynamic metal coordination bonds inside a loosely cross‐linked network of ionogel nanocomposite doped with Fe₃O₄ nanoparticles.     

Electrospinning of plant oil‐based,non‐isocyanate polyurethanes for biomedical applications

Non‐isocyanate polyurethanes (NIPU) have rapidly emerged as a sustainable, less toxic, and environmentally friendly alternative to traditional isocyanate‐based thermoplastic polyurethane (TPU) synthesis. TPU is widely used in the medical industry due to its excellent mechanical properties and elasticity. However, little work has been done to synthesize and electrospin NIPU into fibrous mats for biomedical applications. In this work, melt polymerization of a plant oil‐based cyclic carbonate monomer with polyether soft segments and various diamines yielded isocyanate‐free, segmented poly(amide hydroxyurethane)s (PAHUs). Electrospinning of segmented PAHUs afforded ductile, free‐standing fibrous mats with Young's modulus values between 7 and 8 MPa, suitable for tissue scaffold applications. PAHU fiber mats exhibited 3–4 times greater water uptake than the electrospun TPU control, demonstrating potential utility in drug delivery. Fibroblasts adhered to electrospun PAHU fibrous mats with viability values over 90% after 72‐h, validating its biocompatibility. The results highlight the high performance and potential of electrospun isocyanate‐free polyurethanes mats for biomedical application. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46464.     

真空蒸馏-萃取法提纯天然生育酚的工艺

以甲酯化的大豆油脱臭馏出物为原料,从中分离提纯天然生育酚.首先将甲酯化后的大豆油脱臭馏出物进行冷冻结晶,通过离心分离甾醇;然后再采用真空蒸馏和乙醇萃取工艺提纯生育酚.研究了提纯的工艺条件及工艺过程中生育酚含量的变化.实验结果表明,经过提纯后生育酚含量为55.7%,生育酚总收率约为89.0%.     

苯加氢工艺路线的比较与选择

通过对不同加氢和萃取蒸馏工艺从原料、能耗、投资和产品质量等方面的比较,结合马钢的实际情况,对拟建设的苯加氢工艺路线进行了选择。     

河北省复杂难利用铁矿资源现状及开发利用建议

阐述了河北省的铁矿资源现状,特别是超贫磁铁矿资源的类型、储量及分布,分析了河北省铁矿资源开发现状及供需形势,举例介绍了开采技术条件复杂和选矿技术条件复杂两类型难利用铁矿矿床,提出了加强河北省复杂难利用铁矿开发利用的建议。     

高预应力让压锚杆支护巷道稳定性数值分析

针对老屋基矿煤层巷道高预应力让压锚杆支护特征,用FLAC3D软件进行了弹塑性分析。模拟结果表明,FLAC3D能够比较好地模拟煤层巷道锚固煤（岩）体变形特征和锚杆（索）受力特征。为同类煤矿巷道锚固岩体数值模拟提供了技术参考。     

聚合物多元醇对PU-RIM材料的耐热性影响研究

对高活性聚合物多元醇在PU-RIM材料中的应用进行了研究,考察了聚合物多元醇对材料生产工艺性能与耐热性的影响.结果表明:该类多元醇由于含有大量苯环、丙烯腈等极性基团,可减小材料的热下垂,改善材料的动态热力学性能.     

新型纳米TiO2基光催化材料的修饰和改性

纳米TiO2作为典型的光催化材料一直受到人们的广泛关注,实现TiO2可见光响应的方法包括贵金属沉积、半导体氧化物复合、过渡金属或非金属掺杂以及表面染料敏化等,这些改性方法分别通过阻止光生电子-空穴的复合、窄化带隙、合理的价带匹配等措施提高光催化效率,其中掺杂是改善TiO2催化性能较简便且有效的方法.对有机-无机杂化材料的进一步器件化以及在生命科学领域内的应用探索将是有机功能化表面修饰研究方向的未来热点.     

我国海洋石油钻井平台现状与技术发展分析

海洋油气开发装备产业是直接关系到海洋油气资源开发、影响国家能源稳定和经济安全的战略产业。海洋石油钻井平台是海洋油气开发的关键装备,我国海洋石油装备产业在海洋油气产业持续快速发展的带动下,正处于高速发展的新时期。对我国海洋石油钻井装备产业发展现状及市场需求进行了深入研究,并对海洋石油钻井平台技术特点做了介绍,重点分析了该项技术的发展状况,从钻井平台类型和技术含量等方面指出我国与世界先进海洋石油钻井平台的主要差距,并提出了若干发展建议。     

Multifactor,Sequentially Releasing Scaffolds for Tissue Engineering:Fabrication Using Solvent/Nonsolvent Sintering Technology

Biodegradable constructs, providing both mechanical support to growing tissues and timed release of biological agents, are highly desired in tissue engineering. This study aimed to develop a platform technology that responds to these challenges. Accordingly, we report herein on model systems in which microspheres of poly(suberic anhydride), containing all-trans retinoic acid (atRA), and poly(d,l -lactic acid-co-glycolic acid), containing bovine serum albumin (BSA), were co-sintered at room temperature, using a solvent/nonsolvent mixture. These scaffolds release about 60% of atRA and negligible amounts of BSA within the first five days, followed by slower and steady release of BSA. They have pores of 150–500 μm and a compressive modulus of 200 kPa. Myoblasts and fibroblasts were seeded on the loaded scaffolds and both showed enhanced proliferation rates. Based on sound thermodynamic principles of polymer science, this technology demonstrates an as yet unachieved degree of versatility. It allows for the tailoring of “intelligent” scaffolds that preserve the integrity of the incorporated agents and of advanced modalities to release various drugs in a scheduled manner.