火焰喷涂尼龙1010/纳米TiO2复合涂层力学性能研究

利用电子拉力机探讨了纳米TiO2对火焰喷涂尼龙1010涂层力学性能的影响.结果表明,当复合涂层配比为m(尼龙1010):m(纳米TiO2)=100:0.5时,复合涂层综合性能较佳,涂层自拉伸强度为43.33 MPa,涂层与基体结合强度为40.23 MPa.纳米TiO2能够显著提高涂层力学性能.     

火焰喷涂尼龙1010/纳米SiO2复合涂层的力学及老化性能

利用电子拉力机、紫外光辐照箱、示差扫描量热仪及扫描电子显微镜对火焰喷涂尼龙1010/纳米SiO2复合涂层的力学性能、耐老化性能及热性能等进行了测试.结果表明,当m(尼龙1010):m(纳米SO2)=100:1.5时,复合涂层综合性能较佳,自拉伸强度为69.8 MPa,与基体的结合强度为28.9 MPa;经10 d紫外线老化后,涂层自拉伸强度保持率为80.1%.纳米SiO2有明显的异质成核作用,使复合涂层的过冷度由27 ℃下降为24 ℃.表明纳米SiO2能够显著提高涂层力学性能和抗老化性能,并有助于提高复合涂层的结晶速率,具有明显的成核作用.     

偶联剂对火焰喷涂尼龙/石墨复合涂层摩擦磨损性能的影响

采用均匀试验设计方法,利用摩擦磨损试验机对火焰喷涂尼龙1010/石墨复合涂层的干摩擦磨损性能进行了测定,并对实验结果进行回归分析,结果表明:在实验速度0.2610 m/s~0.9160 m/s,载荷100 N~350 N条件下,经偶联剂处理的尼龙1010/石墨复合涂层的干摩擦系数为0.343~0.387,磨损量为1.8 mg~7.4 mg,明显低于未经偶联剂处理的尼龙1010/石墨复合涂层的干摩擦系数(0.3950~0.4410)和摩损量(2.7 mg~14.5 mg),而且复合涂层的摩擦系数随PV值的变化趋于平稳,复合涂层更适于在高PV值下应用.     

偶联剂TPM对火焰喷涂尼龙1010／石墨涂层力学性能的影响

在火焰喷涂尼龙 10 10 /石墨复合涂层配方中采用了偶联剂 TPM处理石墨技术 ,并利用拉力试验机研究了偶联剂 TPM对复合涂层的宏观力学性能 (涂层自拉伸强度、涂层与基体的结合强度 )的影响 .结果表明 :TPM的加入 ,使复合涂层性能得到改善 ,复合涂层宏观力学性能得到提高 ,从而获得了自拉伸强度 >30 MPa,结合强度 >15MPa的复合涂层 .     

偶联剂对火焰喷涂超高分子量聚乙烯/石墨涂层力学性能的影响

在火焰喷涂超高分子量聚乙烯(UHMWPE)／石墨(G)复合涂层配方中采用了偶联剂TPM处理石墨技术，并利用拉力实验机及红外光谱测定仪等研究了TPM对复合涂层的宏观力学性能(如涂层与基体的结合强度、涂层自拉伸强度)及微观结构的影响。结果表明：偶联剂TPM的加入，使复合涂层的力学性能得到了明显改善，当m(TPM)：m(G)=2：100，m(UHMWPE)：m(G)=100：20时，复合涂层综合性能较好，涂层与基体的结合强度为6．82MPa，涂层自拉伸强度为32．79MPa。     

膨胀石墨红磷复合阻燃聚丙烯的研究

研究了以膨胀石墨为主阻燃剂、红磷为协效剂的复合阻燃剂对阻燃聚丙烯燃烧性能和力学性能的影响.结果表明:当w(复合阻燃剂)=10%,m(膨胀石墨):m(红磷)=2:1时,材料的氧指数为23.4,拉伸强度为35.9 MPa,缺口冲击强度为0.71 kJ/m2,力学性能和阻燃性能指标均达到最大值,材料的综合性能最佳.     

纳米TiO2改性造纸涂料的性能及其流变行为

研究了纳米TiO2改善造纸涂料的性能及添加纳米TiO2对涂布纸涂层抗老化性能的影响.结果表明:纳米TiO2用量为1.0份时能够较好地提高涂层的耐光性能,经光老化后,涂布纸白度和表面强度分别降低了9.6%和13.5%,而不添加纳米TiO2的涂层,白度和表面强度分别降低了17.1%和16.7%.通过流变性实验,分析了添加纳米TiO2涂料的流变行为.     

《郑州轻工业学院学报》（自然科学版）第19卷（2004年）总目录

题　　目作者　　期页·材料与化学工程·金属氧化物纳米微粒的制备研究进展徐甲强 ,等　　 1— 1双二苯基膦甲烷及其铜 (I)配合物的合成与表征刘应凡 ,等　　 1— 6丙烯酸和AMPS共聚合成高吸水性树脂朱学文 ,等　　 1— 8尼龙 66细旦工业丝生产工艺研究康伟峰 ,等　　 1— 1 1尖晶石LiMn2 O4的晶体结构及其合成方法张胜利 ,等　　 2— 1火焰喷涂尼龙 1 0 1 0和纳米石墨复合涂层的力学性能研究李亚东 ,等　　 2— 5用气相色谱法预测挥发性有机试剂的沸点王国庆 ,等　　 2— 8乳状液膜分离技术的研究进展许培援 ,等　　 2— 1 1郑州刺槐…     

响应面法优化超声波处理纳米SiO_x/蛋清蛋白复合膜液的制备

目的:以蛋清蛋白为原料,制备纳米SiOx/蛋清蛋白复合膜,研究超声波处理复合膜液对膜性能的影响。方法:以超声功率、超声时间与间歇时间比、工作时间为试验因素,以拉伸强度、断裂伸长率、水蒸气透过系数及透油系数为响应值,采用单因素试验和响应面分析法,优化超声波处理复合膜液的制备条件。结果:建立了拉伸强度、断裂伸长率、水蒸气透过系数及透油系数的回归模型,优化的超声处理条件为超声功率205.67W、超声时间与间歇时间比1.13:1、工作时间23.32min,在此条件下复合膜各性能的预测值分别为5.141MPa、38.401%、2.719g.mm/(m2.d.kPa)、0.620g.mm/(m2.d),验证值为(5.092±0.146)MPa、(37.560±3.409)%、(2.961±0.083)g.mm/(m2.d.kPa)、(0.667±0.006)g.mm/(m.d),与之接近,优化结果可靠。结论:超声功率和工作时间是影响膜机械性能的主要因素,而超声时间与间歇时间比和工作时间是影响膜阻隔性能的主要因素。     

空气过滤用聚丙烯腈静电纺纤维膜的制备及其性能

为开发用于空气过滤的纳米纤维,采用静电纺丝技术制备了聚丙烯腈(PAN)纳米纤维膜,探讨了其纺丝液质量分数及纺丝电压对所纺纤维微观形貌的影响,同时研究了纤维膜厚度对过滤效率和压降的影响。实验结果表明:PAN纺丝液质量分数为12%,纺丝电压为20 k V时,所得纤维粗细均匀,平均直径为230 nm;当纤维膜厚度由18μm增至35μm时,过滤压降则由121.93 Pa升至591.75 Pa,而过滤效率由81.78%升至99.24%。对过滤性能较好的纤维膜分别进行力学性能和泡压法滤膜孔径测试,测得此纤维膜的弹性模量为223.67 MPa,断裂伸长率为51.96%,拉伸断裂应力为5.93 MPa,拉伸强度为7.77 MPa,拉伸屈服应力为2.79 MPa,平均孔径为2.064 3μm。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press