基于树状PAMAM修饰的PDMS微流控芯片分离检测两种蛋白质

为提高聚二甲基硅氧烷(PDMS)微流体芯片的亲水性,抑制其对蛋白质的吸附,利用树状PAMAM通过物理涂覆的手段对其微通道的表面进行了修饰。对修饰后PDMS微流控芯片的亲水性和电渗流进行了考察,同时利用修饰后芯片对溶菌酶,核糖核酸酶A两种蛋白质进行了分离检测。结果表明,修饰后的PDMS微流控芯片微通道表面形成了一层均匀、稳定的亲水性涂层,有效抑制了对蛋白质的吸附,成功地对溶菌酶和核糖核酸酶A实现了分离,柱效分别达到6.93×104plates/m和7.92×104plates/m,同时修饰后的芯片具有良好的重现性和较长的使用寿命。     

静电植绒法制备超疏水表面研究

利用静电植绒技术在纺织纤维表面构建粗糙结构,结合聚二甲基硅氧烷(PDMS)表面修饰,制备超疏水表面。利用接触角测试仪、马丁戴尔摩擦仪、扫描电镜对材料表面形貌与疏水性能进行测试与表征。结果表明,经PDMS修饰的植绒织物具有超疏水性,其与水滴的静态接触角达150°以上。利用静电植绒技术制备的超疏水表面具有良好的耐磨性,其中绒毛长度为0.6 mm时具有最佳的疏水、耐磨性能。     

PDMS仿生表面及其在防护领域的应用进展

近年来,生物启发的仿生功能表面设计与制备已经成为一个重要且引人注目的研究领域,在日常生活、工业及农业等领域具有广泛的应用。聚二甲基硅氧烷（PDMS）由于其高柔顺性、低表面能和化学稳定性,在仿生表面功能改性方面得到了广泛认可。该文综述了PDMS微纳粗糙型仿生表面和光滑型仿生表面的制备与性能调控方法及其在防腐、防冰、防生物污染和光学设备领域的防护应用进展。对比了不同类型的PDMS仿生表面制备方法的优缺点。阐述了表面性能的调控策略,并对其存在问题和发展趋势进行了总结和展望。     

聚二甲基硅氧烷(PDMS)的表面修饰及在细胞培养中的应用

文章给出了几种应用较多的聚二甲基硅氧烷(PDMS)的表面修饰方法,包括表面改性和表面图案化。研究发现,等离子处理和明胶涂层两种方法结合能有效改善PDMS表面的亲水性。PDMS表面力学性质及图案拓扑结构能够对细胞的生长产生影响。PDMS表面改性的长效性和表面图案对细胞的影响机制还有待进一步研究。     

聚二甲基硅氧烷表面亲水改性的研究进展

聚二甲基硅氧烷（PDMS）广泛地用作制造生物医疗器械和微流控装置材料,但其具有高疏水性,且在表面亲水化处理后容易发生疏水复原,对其应用产生了不利影响。综述了PDMS表面亲水改性的各种方法,如基于等离子体表面处理、静电自组装法、紫外光辐照接枝聚合及表面活性剂动态改性等,并对PDMS表面改性的各种方法进行了评价,指出了PDMS表面改性的发展前景。     

基于聚二甲基硅氧烷制备超疏水表面的研究进展

聚二甲基硅氧烷(PDMS),作为一种价格低廉、环境友好的有机硅材料,被广泛作为超疏水修饰剂来使用,并利用其与固化剂混合后可固化成型的特点,用于构建表面结构。综述了PDMS在制备超疏水材料上的研究进展,并对其今后的发展做出了展望。     

兰州化物所发展出可重复接枝聚合物刷的表面修饰新方法

正表面化学修饰在现代化学、生物学、材料科学、应用科学工程与技术等领域具有重要的作用。表面接枝聚合物刷(polymer brush)作为广泛采用的一种表面修饰方法,由于其适用单体广泛、结构可控、可在多种基底上修饰等特点,近年来成为各个领域研究的热点。利用表面引发原     

PDMS/SiO_2纳米复合材料的制备及其应用

将互不相容的聚二甲基硅氧烷(PDMS)、SiO_2溶解在甲苯溶剂中,通过机械搅拌制备PDMS/SiO_2纳米复合材料,采用喷涂方法对纸样表面进行处理,检测纸样的湿润性、表面形貌和粗糙度、表面元素以及表面耐磨性。结果表明,PDMS/SiO_2纳米复合材料不仅可以粘附在纸样表面,而且可以改变纸样表面润湿性,不影响其表面透明性,具有很好的耐磨性,可应用在纸质照片、档案等方面的保护。     

PDMS/SiO_2纳米复合材料的制备及其应用

将互不相容的聚二甲基硅氧烷(PDMS)、SiO_2溶解在甲苯溶剂中,通过机械搅拌制备PDMS/SiO_2纳米复合材料,采用喷涂方法对纸样表面进行处理,检测纸样的湿润性、表面形貌和粗糙度、表面元素以及表面耐磨性。结果表明,PDMS/SiO_2纳米复合材料不仅可以粘附在纸样表面,而且可以改变纸样表面润湿性,不影响其表面透明性,具有很好的耐磨性,可应用在纸质照片、档案等方面的保护。     

大气压等离子体射流功能改性硅树脂的工艺研究

[目的]采用大气压等离子体射流(APPJ)技术在聚二甲基硅氧烷(PDMS)表面产生结构色的方法和机制鲜有报道。[方法]通过对处在拉伸状态的PDMS进行1 min的氩气等离子体处理,然后释放拉应力,获得了具有环形渐变结构色的PDMS。[结果]扫描电镜(SEM)照片揭示,APPJ处理后的PDMS表面生成了周期排列的纳米褶皱结构,且褶皱周期是逐渐变化的。X射线光电子能谱(XPS)分析表明,经APPJ处理的PDMS表面发生了进一步交联和氧化,生成了弹性模量比PDMS更高的氧化硅物质层。可见光吸收和反射光谱分析表明,具有结构色的PDMS对可见光表现出了更低的反射率,而其垂直方向的可见光透过率则无显著改变。[结论]通过APPJ技术能够简单、快速地对有机硅化合物表面进行改性而获得精细结构色,该工艺方法有望满足显示、传感、防伪、功能材料等领域的实际需求。     

Effect of ultraviolet/ozone treatment on the surface and bulk properties of poly(dimethyl siloxane) and poly(vinylmethyl siloxane) networks

We present a comparative study aiming at comprehending the effect of ultraviolet/ozone treatment on the modification of poly(dimethyl siloxane) (PDMS) and poly(vinylmethyl siloxane) (PVMS) silicone elastomers networks (SENs). Both PDMS and PVMS SENs undergo dramatic changes in their properties when exposed to UVO. The surface chemical composition of both PDMS and PVMS at long UVO treatment times changes substantially and features a high density of hydrophilic groups. There are two major differences in behavior in the two classes of materials. First, relative to PDMS, the PVMS-based SENs get modified throughout the entire bulk. Second, the physico-chemical changes detected in PVMS take place on much shorter time scale relative to PDMS. These results are in accord with our earlier reports that indicated that when exposed to UVO, the topmost ≈5 nm of PDMS gets converted into a silica-like material, which then acts as a barrier for diffusion of atomic oxygen. In this case, the bulk of PDMS maintains its elasticity. In contrast, both the surface and bulk of PVMS films undergo substantial changes in properties when exposed to UVO. First, the surface modification of PVMS SENs takes place after only a few seconds of the UVO treatment. In addition, we register substantial modification of bulk properties, including the complete densification accompanied with increased bulk modulus. Likely, the susceptibility of the vinyl bonds to radical reactions is responsible for this effect.     

Modification of polysiloxane polymers for biomedical applications: a review

This paper reviews methods of modifying polydimethylsiloxane (PDMS) polymers to improve their properties for biomedical applications. The modification methods are discussed under three different categories: bulk, surface and other modification techniques. Surface modification techniques include physical and chemical techniques to modify polymer surfaces. Bulk modification techniques include blending, copolymerization, interpenetrating polymer networks (IPNs) and functionalization. The third category includes less common modification techniques. © 2001 Society of Chemical Industry     

Synthesis, characterization and properties of chitosan modified with poly(ethylene glycol)-polydimethylsiloxane amphiphilic block copolymers

Synthesis of poly(ethylene glycol)-polydimethylsiloxane amphiphilic block copolymers is discussed herein. Siloxane prepolymer was first prepared via acid-catalyzed ring-opening polymerization of octamethylcyclotetrasiloxane (D₄) to form polydimethylsiloxane (PDMS) prepolymers. It was subsequently functionalized with hydroxy functional groups at both terminals. The hydroxy-terminated PDMS can readily react with acid-terminated poly(ethylene glycol) (PEG diacid) to give PEG-PDMS block copolymers without using any solvent. The PEG diacid was prepared from hydroxy-terminated PEG through the ring-opening reaction of succinic anhydride. Their chemical structures and molecular weights were characterized using ¹H NMR, FTIR and GPC, and thermal properties were determined by DSC. The PEG-PDMS copolymer was incorporated into chitosan in order that PDMS provided surface modification and PEG provided good water swelling properties to chitosan. Critical surface energy and swelling behavior of the modified chitosan as a function of the copolymer compositions and contents were investigated.     

Preparation of superhydrophobic surfaces by cauliflower‐like polyaniline

Cauliflower‐like polyaniline (PANI) was successfully prepared using an interfacial polymerization method. By modification with polydimethylsiloxane (PDMS) using chemical vapor deposition method, the surface wettability of cauliflower‐like PANI can be tailored to be superhydrophobic with a water contact angle of 160.4°. The deposition of the low‐surface‐energy silicon coating originated from PDMS pyrolysis on the cauliflower‐like PANI was confirmed by X‐ray photoelectron spectroscopy and Fourier Transform Infrared Spectroscopy. The changes in thermal stability and conductivity of the as‐prepared PANI before and after PDMS treatment were also investigated by thermogravimetric analysis and using a four‐probe method. Compared with nanofiber‐shaped PANI by electrodepositing polymerization, the PDMS‐treated cauliflower‐like PANI has superior surface wettability. Our study may open a new way for fabrication of superhydrophobic surfaces by developing novel nanostructured PANI. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39767.     

Self‐Assembly of Porous Microstructured Polydimethylsiloxane Films for Wearable Triboelectric Nanogenerators

Triboelectric nanogenerator (TENG), a green energy harvester, can harvest mechanical energy from human motion to electric energy to be applied in wearable electronics and sensor network. Porous materials played an important role in enhancing electric performance of TENG. In this paper, Azobisisobutyronitrile (AIBN) is used as a self‐reactive agent to modify Polydimethylsiloxane (PDMS) to form a self‐assembled porous structure (PDMS‐N10 film) through the difference in temperature between PDMS pre‐curing and AIBN decomposition. The PDMS‐N10‐based TENG exhibits a 2.5‐fold and 2.7‐fold improvement in output voltage and current as compared with PDMS without modification respectively. In addition, 116 light‐emitting diodes could be lighted up and 22 µF capacitor is charged. The TENG is also used as a sensor or trigger device for sensing the movements of elbow, knee, wrist, or finger, which can be applied in wearable devices because of the flexibility and durability as well as low cost.     

Extending micro-contact printing for patterning complex polymer brush microstructures

As a fast developing soft lithographic technique, the development of micro-contact printing (μCP) has exceeded the original aim of replicating poly(dimethylsiloxane) (PDMS) stamp patterns. Here we exploited several extended μCP strategies with various printing conditions (over-force or swelling induced physical deformation, and UV-Ozone treated chemical surface modification to a PDMS stamp), combining with surface initiated atom transfer radical polymerization (SI-ATRP), to pattern complex poly(N-isopropylacrylamide) (PNIPAAM) brush microstructures. These series of μCP strategies avoid the need for expensive and sophisticated instrumentation in patterning complex polymer brush microstructures that do not exist on the original PDMS stamp.     

膜结构填料涂覆改性对精馏分离异丙醇/水体系的影响

采用聚二甲基硅氧烷(PDMS)对聚砜(PSf)、聚偏氟乙烯(PVDF)两种不同材料中空纤维膜结构填料进行了疏水涂覆改性,并研究了改性前后膜结构填料在异丙醇/水体系精馏分离中的材料性能变化。实验结果表明:PDMS涂覆使PVDF膜的分离效果提高了约20%,但使PSf膜的分离效果下降3%~10%。经涂覆后,膜结构填料的传质单元高度均在20 cm以下,最小可达5 cm左右;所有膜结构填料均可突破传统精馏操作弹性限制,其传质时间小于10 s,水力学特性和传质效率更优。     

Surface modification of silica and its compounding with polydimethylsiloxane matrix: interaction of modified silica filler with PDMS

The present work involved a thorough study on silane-modified silica filler with special focus on its chemical interaction with polydimethylsiloxanes (PDMS) and the structural model of the modified filler. The samples prepared by addition of modified silica were characterized by Fourier transform infrared spectroscopy (FTIR), specific surface test, scanning electron microscopy (SEM) and fluorescent microscope. FTIR results confirmed the successful silica surface modification with silane coupling agent. The sample containing 80?phr (parts per hundreds of rubber) modified filler with weak ratio of Si?COH/Si?CC group absorbance areas (A ₁/A ₀) showed weak formation of filler agglomerates while a stronger interfacial interaction could take place between the modified silica and PDMS. Specific surface results showed that the dispersion of silica can be improved when the amount of silane modifier to silica reached 2.0?wt%. SEM and fluorescent microscope showed that the filler aggregation was observed in cases of higher silica loading. As expected, when the silica with surface treatment was compared with those without surface modification, the filler particles were found to be fairly well dispersed in PDMS matrix.     

Electron beam effects on polymers. II. Surface modification of bis-GMA substrates by functionalized siloxane oligomers

Surface modification of polymer films via electron beam irradiation was studied using the methacrylic acid derivative of the diglycidyl ether of bisphenol A, commonly called bis-GMA, as a curable substrate. Functionalized polydimethylsiloxane (PDMS) oligomers were utilized as surface modifiers. Considerable changes in the wetting characteristics were observed for the siloxane modified bis-GMA surfaces by critical surface tension measurement. For dosages up to 5 Mrads, the dosage level strongly affects the critical surface tension of the polymer. This result implies differences in the concentration of the attached PDMS oligomers to the bis-GMA substrate. The methacrylate-terminated PDMS was observed to be more effective in lowering the critical surface tension than a similar vinyl-terminated PDMS. Higher molecular weight and multifunctional PDMS coatings resulted in somewhat lower critical surface tensions in the dosage range applied in this study. The surface thickness of the functionalized PDMS coatings which were bonded to the substrate surface depended on the molecular weight of the surface modifiers as obtained by XPS analysis. Peel tests of the uncoated and PDMS coated bis-GMA clearly resulted in agreement with the critical surface tension data. Chemical inertness and poor wettability of PDMS provided the PDMS coatings with enhanced resistance to chemical degradation caused by a 24-h exposure to aqueous nitric and acetic acid.     

PF/PDMS-OH流变性能对其泡沫材料泡孔结构的影响

分别将质量分数为10%,15%和20%的端羟基聚硅氧烷(PDMS–OH)通过机械共混的方法改性酚醛树脂(PF),进而采用化学发泡的方法制备PF/PDMS–OH泡沫复合材料。采用旋转式流变仪表征共混体系的稳态及动态流变性能,研究黏弹性对树脂发泡过程的影响。傅立叶变换红外光谱表征PDMS–OH与树脂在固化过程中的化学反应。扫描电镜表征不同共混体系下泡孔的结构与形态。结果表明,加入15%PDMS–OH的共混体系具有最利于发泡成型的黏弹性,且可与PF形成化学交联作用,对PF泡沫的泡孔形态影响显著。同时红外表征显示,PDMS–OH与PF在固化过程中发生化学交联,这种互穿交联网状结构为PF及泡沫提供了更多稳定的柔性链段。