Improved protein resistance of silicone hydrogels by grafting short peptides for ophthalmological application

A simple and facile approach to impart the antifouling properties of silicone hydrogels was developed in this report. Short peptides were first tethered to silicone hydrogels through terminal amino group-induced epoxy ring-opening click reaction. The modified silicone hydrogels have improved hydrophilicity and protein adsorption resistance because of the formation of zwitterionic structure of the grafted peptides. Furthermore, glycylglycine and diglycyl glycine-modified silicone hydrogel contact lenses were fabricated. They exhibited favorable antifouling property and no damage to rabbits’ eyes after continuous wearing. The short peptide modified silicone hydrogel contact lenses have potential application in ophthalmology.     

Influence of the addition of lubricant on the properties of poly(ether ether ketone) fibers

A high‐temperature lubricant genioplast pellets (GPPS) was used in order to improve the processing behavior of poly(ether ether ketone) (PEEK) resin and high‐performance PEEK fibers were produced by melt‐spinning. The rheological properties of spinning material, morphology, mechanical, and thermal properties of PEEK fibers were characterized by using a polymer capillary rheometer, scanning electron microscopy, single fiber electronic tensile strength tester, wide‐angle X‐ray diffraction and thermal gravimetric analyzer, respectively. The results indicated that the introduction of lubricant GPPS decreased the melting viscosity of PEEK resin and improved spinnability of PEEK resin without sacrificing its thermal properties. The filaments are cylindrical with smooth surface and uniform diameter. The optimized content of GPPS was determined to be 1.0 wt% by balancing the decreased torque and changes of the mechanical properties. The strength and modulus of PEEK fibers were 420 MPa and 3.6 GPa, respectively. This should be due to the improvement in spinnability, followed by the enhancements in the orientation and crystallization of PEEK fibers in the process of drawing and annealing. POLYM. ENG. SCI., 53:2254–2260, 2013. © 2013 Society of Plastics Engineers     

Review of quantitative structure‐activity/property relationship studies of dyes: recent advances and perspectives

Dyes have been applied and are playing an increasingly important role in many industries, including the textile, printing, medical and energy industries. Their wide applications imply that specific dyes possessing given properties need to be effectively designed. The present review aims to survey information related to activity/property research of dyes that has been published in the past two decades. Emphasis is laid particularly on studies based on quantitative structure–activity/property relationships that have contributed to the theoretical design and application of dyes. Finally, the perspectives of quantitative structure‐activity/property relationship studies are set out in order to show how this method may be used to design new dyes and to evaluate their different properties. The challenges facing these studies are also outlined.     

MBBR废水处理工程应用关键问题探讨

主要介绍了移动床生物膜反应器(MBBR)的工艺原理、特点及国内外研究现状。结合其在废水处理中存在的关键问题提出了相应的对策,并对今后发展的前景进行了展望。     

深圳市电镀、印制电路板行业环境风险评价指标体系研究

基于深圳市电镀、印制电路板行业存在的环境问题及环境风险现状,结合国家相关技术指南及导则,提出建立一种电镀、印制电路板行业环境风险评价指标体系,为深圳市试点环境污染责任险制度提供技术支持.     

简易四轮式大型螺旋盘管机的结构介绍

本文对大型螺旋盘管机的原理及构造作一分析介绍,阐明其适用性和使用要求。     

印染废水超滤工艺中操作方式对过滤速率的影响

对某印染厂废水处理站排水进行了回用处理研究.在恒压条件下,采用聚乙烯(PE)中空纤维膜,进行间歇曝气扫流过滤,分析了不同操作方式对超滤速率变化的影响.结果表明曝气在超滤中能够起到防止污染的作用,解除作用于颗粒上的抽吸力后再采用曝气扫流,则能达到更好的扫流效果.周期运行与非周期运行之间的差距较大,按"曝气过滤-暂停-曝气扫流"<"不曝气过滤-暂停-曝气扫流"<"连续曝气扫流"的顺序阻力增大,因此采用周期运行方式在一定程度上可以恢复超滤速率.印染废水过滤中,在抽吸压力小于0.08 MPa的范围内,可以不考虑沉积物的压缩性.     

Supercritical CO2 extraction of Plumula nelumbinis oil: Experiments and modeling

Supercritical CO₂ extraction of Plumula nelumbinis oil was investigated at temperatures of 308–338 K and pressures of 15–45 MPa. The yield of the extracted oil was 0.128 g/g material at optimal conditions, in which gamma-sitosterol, unsaturated fatty acids and gamma-tocopherol had higher relative concentrations as determined by GC–MS. The broken and intact cell (BIC) model, with reduced adjustable parameters, was utilized to simulate the SFE process. The values of average absolute relative deviation (AARD) were in the range 2.34–10.9%, indicating that the improved method had a similar effect to the BIC model when three parameters were adjusted. The parameters obtained during the modeling had clear physical meanings and were used to gain an in-depth understanding of the SFE process theoretically.     

低介电（ε〈2）低密度硅灰石陶瓷材料的研制

叙述了几种不同成分的配比对材料强度以及介电常数的影响,并进行了相应的分析。分析结果表明,利用磷酸或聚合磷酸铝结合空心球可研制出ε〈2的介电材料,材料的研制对宽频天线罩电性能的设计有一定的参考价值。     

影响UV固化聚酯型水性聚氨酯-丙烯酸酯涂层性能的因素

选用异佛尔酮二异氰酸酯(IPDI)、聚酯二元醇、二羟甲基丙酸(DMPA)、甲摹丙烯酸-β-羟乙酯(HEMA)等为原料,采用阴离子自乳化法制备了紫外光(UV)固化聚酯型水性聚氨酯-丙烯酸酯预聚体,并配以光引发剂,其涂层经紫外光固化.讨论了光引发剂和n(-NCO):n(-OH)对涂层性能的影响.研究结果表明,复配光引发剂种类及比例为m(光引发剂B):m(光引发剂c)=1:1,用量为HEMA质量分数的10%时,涂层性能最好.