磷酸胆碱表面改性涤纶材料及抗凝血性研究

采用氧等离子体预处理涤纶材料（聚对苯二甲酸乙二醇酯,PET）表面,并通过紫外辐照在其表面接枝聚合丙烯酸,以接枝聚丙烯酸链中的羧基为反应位点,通过原子转移自由基聚合在PET表面进一步固定磷酸胆碱聚合物。经漫反射红外光谱及X射线光电子能谱分析测试表明,涤纶薄膜表面成功地固定了磷酸胆碱聚合物。经磷酸胆碱聚合物改性的涤纶表面亲水性得到改善,体外抗凝血性评价表明,固定磷酸胆碱的PET表面能够有效地抑制纤维蛋白原分子的变性,降低血小板粘附和激活。     

纳米重晶石对聚对苯二甲酸乙二醇酯力学性能及结晶的影响

通过熔融共混法制备了聚对苯二甲酸乙二醇酯/重晶石纳米复合材料,研究了纳米重晶石用量对聚对苯二甲酸乙二醇酯力学性能和结晶行为的影响。结果表明,纳米重晶石对聚对苯二甲酸乙二醇酯有明显的增强作用,在纳米重晶石用量为3%(质量分数)时,对比纯聚对苯二甲酸乙二醇酯,复合材料拉伸强度提高了9.4%,弯曲强度和弯曲模量分别提高了10.8%和21.9%,聚对苯二甲酸乙二醇酯复合材料弯曲强度最高可提高15.8%。在复合材料中,纳米重晶石起到异相成核的作用,提高了聚对苯二甲酸乙二醇酯的结晶速率和结晶度,减少了聚对苯二甲酸乙二醇酯的晶粒尺寸。     

等离子体表面接枝改性聚对苯二甲酸乙二醇酯的血液相容性研究

利用等离子体表面接枝改性方法在聚对苯二甲酸乙二醇酯(polyethylene terephthalate，PET)材料表面接枝不同分子量的聚乙二醇(PEG)，体外血液相容性实验表明．接枝了PEG的PET材料的血液相容性与PEG的分子量有关；当接枝的PEG分子量达到6000时，材料的血液相容性最好。     

化工新型材料

欧盟对印度PET薄膜作出反倾销复审终裁据报道,2011年1月20日,欧盟对原产于印度的聚对苯二甲酸乙二醇酯薄膜作出反倾销期中复审终裁:对印度Garware聚酯有限公司的反倾销税率修改为0%。2000年5月,欧盟对原产于印度的聚对苯二甲酸乙二醇酯薄膜进行反倾销立案调查;2001年8月,欧盟对此案作出肯定性终裁;2009年12月,欧盟对原产于印度的聚对苯二甲酸乙二醇酯薄膜进行反倾销期中复审立案调查(商务部网站)     

L-精氨酸改性聚对苯二甲酸乙二醇酯膜的血液相容性

以戊二醛为交联剂,采用三步反应将L-精氨酸共价固定在聚对苯二甲酸乙二醇酯膜表面。用XPS和FT-IR检测了改性前后膜表面化学组成和结构的变化;通过接触角测定表征了膜表面化学组成对膜亲水性的影响;用BCA(bicinchoninic acid)法测定了膜表面吸附的蛋白量;借助扫描电镜观察了血小板在膜表面的粘附状况。结果显示:膜表面的水接触角由改性前的78.5°降低到改性后的43.7°;改性PET膜表面的蛋白吸附量比未改性PET的下降了25%;改性膜表面只有稀疏血小板粘附,且粘附的血小板呈圆形。     

聚酯薄膜表面接枝含氟丙烯酸酯共聚物及其细菌粘附行为研究

利用表面引发原子转移自由基聚合(SI-ATRP)在聚对苯二甲酸乙二醇酯(PET)薄膜表面接枝甲基丙烯酸六氟丁酯(HFBMA)和甲基丙烯酸甲酯(MMA)共聚物。通过红外光谱仪(ATR-FT-IR),X射线光电子能谱仪(XPS)以及扫描电镜(SEM),研究不同反应时间下接枝共聚物对PET薄膜表面组成、结构及性能的影响;利用接触角测试对比研究PET薄膜接枝改性前后的表面疏水性;采用平板菌落计数的方法研究薄膜改性前后的微生物粘附性。结果表明:随着反应时间延长,PET薄膜表面水接触角不断增大,当反应时间为12h时达99.5°,疏水性显著提高;PET薄膜表面对微生物的粘附量随着反应时间的延长而逐渐减少。     

涤纶材料表面固定水蛭素及其血液相容性研究

利用紫外辐照仪在聚对苯二甲酸乙二醇酯(涤纶,PET)膜表面接枝聚丙烯酸(PET-AA)长链分子,再通过化学方法进一步固定水蛭素,获得的改性表面的X光电子能谱分析表明水蛭素分子被有效地固定在PET表面.改性表面的水接触角降低,亲水性得到改善.体外血小板粘附实验的结果显示,固定了水蛭素的PET薄膜的血液相容性比未改性的PET膜有明显的改善.     

具有高阻隔性能的聚对苯二甲酸乙二醇酯复合材料的制备方法EI北大核心CSCD

本发明涉及一种聚对苯二甲酸乙二醇酯（PET）的复合材料的制备方法,特别涉及一种由PET与纳米氧化物复合而成的具有高阻隔性能的PET复合材料的制备方法。本发明的聚对苯二甲酸乙二醇酯与无机纳米氧化物的复合材料,是在PET合成过程中的酯化或缩聚阶段中加入无机纲米氧化物溶胶,     

聚对苯二甲酸丙二醇酯树脂的流变特性研究

采用毛细管流变仪研究聚对苯二甲酸丙二醇酯（PTT）和聚对苯二甲酸乙二醇酯（PET）的流变性能。结果表明,PTT与PET一样,都是切力变稀流体,从PTT在255℃时的非牛顿指数比PET在280℃时低和PTT的弹性雷诺准数（NRt,dl)随切变速率增加比PET明显可看出,PTT不但切力变稀现象更严重些,而且更易储存可回复弹性能,因而纺丝工艺更需稳定控制。     

聚酯纤维的附生结晶法改善纤维的表面浸润性

将聚对苯二甲酸乙二醇酯(PET)纤维置入过冷态的聚乙二醇(PEG)和聚己二酸丁二酯(PBA)熔体,制备了PET纤维/PEG基体和PET纤维/PBA基体复合体系。使用偏光显微镜和原子力显微镜研究了这两种异质复合体系的界面结晶形态,利用接触角测量仪测量了附生结晶法改性前后PET纤维织物的接触角。结果表明,纤维置入温度和结晶等条件决定附生体系的横穿晶体形态结构,选取合适的树脂并采用附生结晶的方法可明显改善PET纤维织物的表面浸润性,并有望改善PET纤维增强复合材料内部的界面结构。     

Study of oxygen plasma pre-treatment of polyester fabric for improved polypyrrole adhesion

In this work, we have systematically studied the improvement of binding of polypyrrole with polyethylene terephthalate (PET) thin films and fabrics using low pressure oxygen plasma. A range of plasma treatment times were employed to investigate plasma induced effects on surface roughness, surface chemistry and hydrophilicity. Modifications of PET films were studied with respect to surface morphology by means of atomic force and scanning electron microscopy. Chemical effects of plasma treatment were studied using X-ray photoelectron spectroscopy. Results showed that both the increase in surface functionalisation by carboxylic groups and formation of nano size roughness contributed to improved adhesion and conductivity.     

Surfactant-dependent macrophage response to polypyrrole-based coatings electrodeposited on Ti6Al7Nb alloy

In this study, polypyrrole (PPy) films were successfully synthesized on Ti6Al7Nb alloy by potentiostatic polymerization in the presence of poly(sodium 4-styrenesulfonate) (NaPSS), t-octylphenoxy polyethoxyethanol (Triton X-100) and N-dodecyl-β-D-maltoside (DM) surfactants. Atomic force microscopy (AFM) analysis of the PPy/surfactant composite films revealed a granular structure characterized by a lower surface roughness than un-modified PPy films. The results demonstrated that addition of surfactants, namely Triton X-100 and DM, can improve electrochemical film stability and corrosion resistance. Further, Triton X-100 enhanced the adhesive strength of PPy films to the substrate. The surfactant type also showed a great influence on the surface wettability, the highest hydrophilic character being observed in the case of PPy/PSS film. Few studies have been devoted to the elucidation of inflammatory cell response to PPy-based materials. Therefore, RAW 264.7 macrophages were cultured on PPy-surfactant films to determine whether they elicit a differential cell behavior in terms of cell adhesion, proliferation, cellular morphology and cytokine secretion. Our results highlight the dependence of macrophage response on the surfactants used in the pyrrole polymerization process and suggest that the immune response to biomaterials coated with PPy films might be controlled by the choice of surfactant molecules.     

氧化铝基体表面预处理对金刚石薄膜生长的影响

采用微波等离子体化学气相沉积方法,在经不同预处理的氧化铝衬底上沉积金刚石薄膜.用X射线衍射仪、激光拉曼光谱仪、扫描电镜(SEM)对所得薄膜的成分、物相纯度和表面形貌进行表征,比较不同的预处理方式对金刚石薄膜生长的影响.结果表明,基体表面经过熔融碱腐蚀后形成薄膜的膜基结合良好且膜材质量最佳,但表面平整度较低;而基体只经金刚石微粉乙醇悬浊液超声处理则在沉积时金刚石容易成膜,且结构要更为致密;在经过酸腐蚀的基体上沉积金刚石薄膜时,容易在薄膜与基体之间先形成过渡层,而后才进行金刚石薄膜的沉积.所得结果表明熔融碱腐蚀处理是获得电学应用氧化铝基金刚石薄膜复合材料的最适宜的基体表面预处理.     

Preparation, characterization and anion exchange properties of polypyrrole/carbon nanotube nanocomposites

In this study, polypyrrole (PPy) thin films were electrodeposited on carbon nanotube (CNT) backbones by applying a constant deposition potential in 0.1 M pyrrole solution with different electrolytes, such as NaCl, NaNO3, or NaClO4. The hybrid films were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy, and cyclic voltammetry. SEM images revealed the nanostructrure of PPy films generated on CNT surface. The electrochemical and anion exchange properties of the PPy-CNT composite films have been investigated. Nanostructured composite thin films of PPy-CNTs were studied by cyclic voltammetry between 0.4 and -0.8 V in aqueous solution to evaluate their cycling stability and capacity for electrically switched anion exchange. The presence of the CNT backbone greatly improved the anion exchange capacity and stability of the PPy-CNT composite film, which may be attributed to the high surface area of CNT matrix, nanostructure of the PPy film, and the interaction between CNTs and PPy.     

非织造基磁控溅射纳米银薄膜导电性能的研究

在室温条件下采用射频磁控溅射在丙纶(PP)、聚乳酸(PLA)熔喷非织造布表面生长纳米银(Ag)薄膜,并且用等离子体预处理样品进行对比。采用扫描电子显微镜(SEM)对其形貌进行表征,采用四探针测试仪对所制备的纳米薄膜的导电性能进行表征。研究溅射时间、孔隙率及孔径分布和等离子处理对非织造基纳米银薄膜的导电性能的影响。实验表明:随着反应溅射时间的增加,薄膜的方块电阻值下降,导电性能增加;孔径大小也影响薄膜的导电性能,随着孔径的增大,薄膜的导电性能降低;等离子体处理对织物表面进行刻蚀,增加了纤维的比表面积,提高了纤维的润湿性能,改善了织物的导电性能。     

Pretreatment of polyethylene terephthalate substrate for the growth of Ga-doped ZnO thin film

The effect of the pretreatment of polyethylene terephthalate (PET) substrate on the growth of transparent conducting Ga-doped ZnO (GZO) thin film was investigated. Because of its high gas and moisture absorption and easy gas permeation, PET substrate was annealed at 100 degrees C in a vacuum chamber prior to the sputtering growth of GZO thin film for the outgassing of impurity gases. GZO thin film was deposited on the pretreated PET substrate by rf-magnetron sputtering and significantly improved electrical properties of GZO thin film was achieved. Electrical and structural characterizations of the GZO thin films were carried out by 4-point probe, Hall measurement, and scanning electron microscopy, and the effects of the pretreatment on the improved properties of GZO thin films were discussed. This result is not only useful to PET substrate, but also could be applicable to other plastic substrates which inevitably containing the moisture and impurity gases.     

Factors affecting the adhesion of microwave plasma deposited siloxane films on polycarbonate

The effects of a radiofrequency oxygen plasma pretreatment and residual water content in the substrate on the adhesion of microwave plasma deposited tetramethyldisiloxane thin films on Bisphenol-A polycarbonate (BPA-PC) were investigated. Samples were characterised using a crosshatch adhesion test, optical and electron microscopy, and X-ray photoelectron spectroscopy. It was found that the use of a low power (5 W) and low treatment time (0.1 s) oxygen plasma can improve adhesion while greater treatment times (1–30 s) and higher oxygen plasma powers (40 W) resulted in a decreased level of adhesion. In addition, it was shown that a BPA-PC water content greater than 90 ppm resulted in rapid adhesion failure of deposited films at the substrate–plasma polymer interface during outdoor weathering. All films degraded substantially when exposed to environmental weathering, indicating ageing reactions within the plasma polymer films themselves, and at the bulk polymer–coating interface.     

Fluidized bed micro-machining and HFCVD of diamond films onto Co-cemented tungsten carbide (WC-Co) hardmetal slabs

The effect of fluidized bed (FB) treatment upon hot filament chemical vapor deposition (HFCVD) of polycrystalline diamond films onto WC-Co hardmetal substrates was investigated. Several scenarios to make the substrates ready for HFCVD were, comparatively, evaluated and the resulting diamond films were examined in terms of their morphology and adhesion. The diamond grain density was measured by scanning electron microscopy. The adhesion of continuous diamond film to substrate was evaluated by the reciprocal of the slope of crack radius-indentation load functions. Surface binder dissolution followed by FB treatment (PF pretreatment) allowed very high diamond nucleation density and smaller grain size. The adhesion of films grown on PF pretreated substrates was found to be very close to that of films deposited on hardmetal slabs pretreated by Murakami's reagent followed by Co etching with Caro's acid and seeded with diamond suspension in an ultrasonic vessel (MPS pretreatment). However, diamond coatings on MPS pretreated samples exhibited a rougher surface morphology as a result of both lower diamond nucleation density and larger substrate surface roughening by Murakami's etching. Based upon experimental findings, our newly developed PF pretreatment was found to be a very promising technique in substrates conditioning as well as in promoting adherent, uniform and smooth diamond coatings onto hardmetal tools and wear parts.     

Improved impermeability of PET substrates using oxygen and hydrogen plasma

A considerable decrease in permeability of polyethylene terephthalate (PET) films by means of surface plasma treatment in a reactive ion etching system is reported. The effects of oxygen and hydrogen radio frequency plasma on the surface properties of PET polymers are investigated by infrared spectroscopy, scanning electron microscopy (SEM), and X-ray photon spectroscopy (XPS). The surface morphology of the samples has been investigated using SEM and atomic force microscopy (AFM). The optical transmission spectroscopy has been studied further confirming the significant effect of O-plasma. Also the penetration of air through the treated substrates was investigated using a vacuum test. It is found that oxygen and hydrogen plasmas lead to about four-fold reduction in the penetration of air through the PET films, while the effect of hydrogen plasma has been more significant. In addition, oxygen plasma results in a rougher surface as observed both by AFM and SEM analyses. The formation of nanostructures on PET surfaces has been observed at plasma powers of 0.3 W/cm².     

聚吡咯／多壁碳纳米管的合成及电化学行为

在含有多壁碳纳米管(MWCNT)的十二烷基苯磺酸钠(SDBS)溶液中电化学氧化吡咯(Py)制得聚吡咯/多壁碳纳米管(PPy/MWCNT)导电复合膜。研究了聚合温度、电流密度、吡咯浓度对PPy/MWC-NT复合膜沉积量的影响,采用交流阻抗谱(EIS)法研究了该导电复合膜的电化学行为,并用扫描电子显微镜对其表面形貌进行了观察。实验结果表明,随着温度的降低、电流密度及吡咯浓度的增大,复合膜沉积量变大。与纯PPy膜相比,PPy/MWCNT复合膜有更好的电子传递行为,而复合膜表面更加粗糙、疏松。