Three different low-temperature plasma-based methods for hydrophilicity improvement of polyethylene films at atmospheric pressure

Three different low-temperature plasma-based methods were used to improve the surface hydrophilicity of polyethy- lene （PE） films, and all the modification processes were carried out by employing an atmospheric pressure plasma jet （APPJ） system. （a） PE films were directly modified by APPJ using a gas mixture of He and 02. （b） Acrylic acid （AA） was introduced into the system and a polymer acrylic acid （PAA） coating was deposited onto the PE films. （c） AA was grafted onto the PE surface activated by plasma pre-treatment. It was found that the hydrophilicity of the PE films was significantly improved for all the three methods. However, the samples modified by Process （a） showed hydrophobicity recovery after a storage time of 20 days while no significant change was found in samples modified by Process （b） and Process （c）. The Fourier transform infrared spectroscopy （FTIR） results indicated that the most intensive C=O peak was detected on the PE surface modified by Process （c）. According to the X-ray photoelectron spectroscopy （XPS） analysis, the ratios of oxygen-containing polar groups for samples modified by Process （b） and Process （c） were higher than that modified by Process （a）.

Amine-functionalized metal organic framework@graphene oxide as filler in PAEK-containing carboxyl group membrane for ultrafiltration with ultra-high permeability and strong fouling resistance

Achieving high fouling resistance and permeability using membrane separation technology in water treatment processes remains a challenge.In this work,a novel mixed-matrix membrane(MMM)(poly(arylene ether ketone)[PAEK]-containing carboxyl groups[PAEK-COOH]/UiO-66-NH_(2)@graphene oxide[GO])with superb fouling resistance and high permeability was prepared by the nonsolvent-induced phase separation method,by in-situ growth of UiO-66-NH_(2) on the GO layer,and by preparing hydrophilic PAEK-COOH.On the basis of the structure and performance analysis of the MMM,the maximum water flux reached 591.25 L·m^(-2)·h^(-1) for PAEK-COOH/UiO-66-NH_(2)@GO,whereas the retention rate for bovine serum albumin increased from 85.40%to 94.87%.As the loading gradually increased,the hydrophilicity of the MMMs increased,significantly enhancing their fouling resistance.The strongest anti-fouling ability observed was 94.74%,which was 2.02 times greater than that of the pure membrane.At the same time,the MMMs contained internal amide and hydrogen bonds during the preparation process,forming a cross-linked structure,which further enhanced the mechanical strength and chemical stability.In summary,the MMMs with high retention rate,strong permeability,and anti-fouling ability were successfully prepared.

一种两亲性共聚物的合成及其对PVDF膜的改性研究

用一步自由基聚合法从苯乙烯(St)和甲基丙烯酸(MAA)制备了一种两亲性共聚物PSxMAAy,并将其作为聚偏氟乙烯(PVDF)膜材料的共混添加剂,通过液体沉淀相转化法制备得到各种改性的PVDF膜.研究表明,该添加剂PSxMAAy不仅和PVDF在一定范围内有好的相容性,而且含较高MAA比例的添加剂(即PS1MAA1相对于PS4MAA1)对PVDF膜的亲水性及抗污染性的提高具有更大的优势.取决于添加剂的比例,改性PVDF膜的亲水性可大大提高(水接触角可从未改性PVDF膜的93.5°下降为改性PVDF膜的62.1°);对牛血清蛋白(BSA)的抗污染能力显著增强(相比未改性膜BSA的静态吸附量的降低可高达82%).在对BSA和正十六烷乳液的膜过滤实验中,改性PVDF膜对BSA和正十六烷均表现出较好的截留效果和更强的抗污染性能,相比未改性膜的通量衰减率降低而通量恢复率提高.

聚乙烯表面亲水化改性及其血液相容性改进

以过氧化苯甲酰(BPO)为引发剂,在聚乙烯(PE)膜表面接枝丙烯酸(AA)以改善其亲水性。系统地讨论了引发剂浓度、单体浓度、反应温度以及反应时间等各影响因素对接枝率的影响,并通过傅立叶变换红外(FT-IR)、表面水接触角等物理手段来表征接枝膜的表面结构、亲水性等性能。实验结果表明BPO能成功引发丙烯酸接枝PE膜,接枝改性后PE膜亲水性有了明显的提高。采用了3种比较直观的常规评价方法对PE膜接枝改性前后的血液相容性进行初步的评价。研究结果表明表面接枝AA后的PE膜与血细胞的相互作用较弱,对血细胞的破坏程度明显减小,其抗凝血性比未接枝改性膜有显著提高。

用于高集成度数字PCR平台的微流控芯片

数字聚合酶链式反应(PCR)是一种强大且应用广泛的核酸检测技术。现有数字PCR平台大多存在体积庞大、集成度低、耗材价格高、样品消耗大和人工干预多等缺点。设计并制备了一款基于样本自分离的低成本数字PCR微流控芯片,该芯片的独立PCR微反应腔室数量达到37440个。通过对芯片进行进样效率、亲水性改良以及透光性研究,验证了该芯片完全可以满足高集成度数字PCR平台的实验需求。实验结果表明,芯片样液注入与防蒸发矿物油注入全过程可以在2 min内完成,且样品消耗总体积在2μL以内。根据进样腔室数量占总腔室数量比例,得出芯片进样效率可以达到99%以上,且经过亲水性处理后的芯片透光率可达到90%以上。该微流控芯片能很好地满足高集成度数字PCR平台的使用需求。

改性聚丙烯纤维混疑土的力学性能

为克服水泥混凝土脆性大、易开裂的缺点,在混凝土的拌制过程中加入了改性处理的聚丙烯纤维,并通过空白和加纤维的混凝土多种力学性能研究的对比试验,发现在1m3水泥混凝土中掺入长度为19mm的0.9kg改性聚丙烯纤维,对其诸多的力学性能均有明显的增强作用.

Influence of air addition on surface modification of polyethylene terephthalate treated by an atmospheric pressure argon plasma brush

An atmospheric pressure argon plasma brush with air addition is employed to treat polyethylene terephthalate(PET)surface in order to improve its hydrophilicity.Results indicate that the plasma plume generated by the plasma brush presents periodically pulsed current despite a direct current voltage is applied.Voltage-current curve reveals that there is a transition from a Townsend discharge regime to a glow one during one discharge period.Optical emission spectrum indicates that more oxygen atoms are produced in the plume with increasing air content,which leads to the better hydrophilicity of PET surface after plasma treatment.Besides,an aging behavior is also observed.The hydrophilicity improvement is attributed to the production of oxygen functional groups,which increase in number with increasing air content.Moreover,some grain-like structures are observed on the treated PET surface,and its mean roughness increases with increasing air content.These results are of great importance for the hydrophilicity improvement of PET surface with a large scale.

水性聚氨酯研究进展综述

本文通过查阅国内外有关文献资料，阐述了水性聚氨酯的制备方法、性能改进及应用，综述了水性聚氨酯目前的研究和发展状况，指出了其前沿研究领域，并对这一蓬勃发展的新型高分子材料作了展望。

SYNTHESIS OF AMPHIPHILIC COMB-SHAPED COPOLYMERS USED FOR SURFACE MODIFICATION OF PVDF MEMBRANES

The synthesis of a novel amphiphilic comb-shaped copolymer consisting of a main chain of styrene-(N-(4- hydroxyphenyl) maleimide)(SHMI) copolymer and poly(ethylene glycol) methyl ether methacrylate(PEGMA) side groups was achieved by atom transfer radical polymerization(ATRP).The amphiphilic copolymers were characterized by ~1H-NMR, Fourier transform infrared(FTIR) spectroscopy and gel permeation chromatography(GPC).From thermogravimetric analysis (TGA),the decomposition temperature of SHMI-g-PEGMA is lower ...

Preparation of Hydrophilic UHMWPE Hollow Fiber Membranes by Chemically Bounding Silica Nanoparticles

In this work, ultra-high molecular weight polyethylene (UHMWPE) microfiltration hollow fiber membranes prepared via the thermally induced phase separation (TIPS) method were modified by chemically bounding hydrophilic silica (SiO2) nanoparticles onto the surface to improve anti-fouling performance. A range of testing techniques including attenuated total reflection Flourier transformed infrared spectroscopy(ATR-FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), water contact angle, mechanical test,filtration and anti-fouling performance were carried out to discuss the influence of different modification conditions on the properties of the membranes. The prepared hollow fiber membranes display the significantly excellent performance when the vinyl trimethoxy silane (VTMS) concentration was 13%, the pH value of the hydrolyzate was 4 and the hydrolysis reaction time was 6 h. In particular, the hydrophilicity of modified membranes was improved effectively, resulting in the enhancement of membrane anti-fouling properties. The results of this work can be consulted for improving the anti-fouling performance of the UHMWPE microfiltration hollow fiber membrane applied in the field of water purification.

聚乳酸衍生物的设计与合成及性能研究

合成聚丙交酯,先用BOC氨基酸的羧基(BOC为叔丁基氧羰基)与聚丙交酯末端的羟基进行酯化反应,然后用甲酸除掉BOC基团.最后用葡萄糖内酯与氨基反应,在聚丙交酯的末端引入了亲水性的葡萄糖基团,最终实现了对聚丙交酯的亲水性修饰.

篮球革用增涩整饰剂

以亲水性聚氨酯树脂、抗粘耐磨剂聚丙烯微粉、涩度改进剂丝肽粉等为原料 ,制备了一种用于聚氨酯篮球革表面的增涩整饰剂。研究了增涩整饰剂的配方及制备工艺。讨论了亲水性聚氨酯树脂、涩度改进剂、抗粘耐磨剂、溶剂配伍等对制品的性能的影响。

浅谈城市生态亲水型河堤断面设计

通过成都市锦江生态带整治项目,对城市内河河道治理方法进行了探讨。针对城市内河亲水性河堤设计理念进行了深入研究。详细介绍了工程总体布置方案、河道行洪断面设计及生态断面结构设计。

RP-HPLC法同时测定甘西鼠尾草中12种成分的含量

目的:建立、丹酚RP酸-H PLC法同时测定甘西鼠尾草药材及饮片中的丹参素钠、咖啡酸、异阿魏酸、丹酚酸D、迷迭香酸、紫草酸B、丹酚酸:采用A、二氢丹参酮Ⅰ、隐丹参酮、丹参酮Ⅰ、丹参酮Ⅱ_A 8种水溶性化合物和4种脂溶性化合物的含量。方法甲溶液,梯度洗脱,流速为Shim-pack XR-ODSⅡ(75 mm×2.0 mm,2.2μm)色谱柱,流动相为乙腈酸水-0.12%甘0.2 mL·min-1,柱温30钠℃,检测波长、咖啡酸、异阿27魏0酸nm,进样量、丹酚酸4μL。结果:在50 min内,西鼠尾草中的、丹酚酸12种成分可实现完全分离,丹参素D、迷迭香酸、紫草酸、丹酚酸BμA、二氢丹参酮Ⅰ、隐丹参酮、丹参酮Ⅰ、丹参酮ⅡA质量浓度分别在0.22~22.3μg·mL-(1r=0.999 8,n=6)、0.05~4.91 g·mL-(1rμ=0.999 8,n=6)、0.18~18.25μg·mL-(1r=1μ.000,n=6)、0.28~28.40μg·mL-1(r=0.999 9,n=6)、(13.50~1 349.89 g·mL^(-1)(r=0.999 9,n=6)、0.23~23.22 g·mL^(-1)(r=0.999 7,n=6)、9.9、3~993.16μg·mL^(-1)r=0.999 8,n,n=6)、0.04~3.87μg·mL-1(r=1.000,n=6)、0.81~81.33μg·mL-1(r=0.999 8,n=6)0.87~86.85μg·mL-1(r积=0.999 9=6)、0.67~67.47μg·m回L-1(r收率=(0.9n99 4,n=6)和1.01~101.12μg·mL^(-1)(r=0.999 8,n=6)与峰面呈良好的线性关系,方法的平均(=6)分别为99.2%(RSD=1.7%)、99.7%(RSD=1.4%)、101.0%RSD=2.0%)、99.7%(RSD=2.1%)、99.5%(RSD=1.9%)、101.2%(RSD=1.9%)、100.8%(RSD=1.7%)、(100.7%(RSD=1.8%)、101.6%(R简SD便=、1准.5%)、确,灵1敏00度.7%(高,专RS属D=性1.好6%)、,经方10法0.学5%(验证R可SD同=1时.4测%)和定甘西1鼠00尾.0草%中R的SD=1.7%)。结论:该分析方法12种化学成分的含量,可用于甘西鼠尾草及其制剂的质量控制。

SURFACE MODIFICATION OF PVDF POROUS MEMBRANES

A novel method for the surface modification of PVDF porous membranes was introduced. Styrene-（N-（4- hydroxyphenyl） maleimide） alternating copolymer SHMI-Br was blended with PVDF to fabricate SHMI-Br/PVDF membranes. The C-Br bond on the SHMI-Br/PVDF membrane was served as initial site of ATRP, and P（PEGMA） brush was grafted on the PVDF membrane. Attenuated total reflectance-Fourier transform infrared spectroscopy （ATR/FTIR） was used to prove the P（PEGMA） brushes were successfully grafted onto the SHMI-Br/PVDF membrane surface. Introduction of P（PEGMA） brushes on the PVDF membrane surface enhanced the hydrophilicity effectively. When the PEGMA degree of grafting was 16.7 wt%, the initial contact angle of PVDF membrane decreased from 98° to 42°. The anti-fouling ability of PVDF membrane was improved significantly after P（PEGMA） brush was ~afted. Taking the PEGMA degree of grafting 16.7 wt% as an example, the flux of protein solution was about 151.21 L/（m h） when the pH value of the BSA solution was 4.9. As the pH value was increased to 7.4, the flux was changed to 180.06 L/（m2 h）. However, the protein solution flux of membrane M3 （PEGMA： 0 wt%） was only 73.84 L/（m2 h） and 113.52 L/（m2 h） at pH 4.9 and 7.4, respectively.