Ti02纳米晶的低温制备及其抗紫外线性能

采用溶胶一凝胶法,在低温条件下制备纳米TiO2.用x射线衍射(xRD)对其结构和粒径进行表征,并测试分析了纳米TiO2溶胶对紫外一可见光的透射和吸收特性.结果表明,制得的纳米TiO2为锐钛矿型纳米晶,粒子尺寸小于10nm纳米TiO2溶胶在波长250-350nm的紫外光区透射率极小.在220-340 nm区域出现强吸收峰.将制得的纳米TiO2制成整理剂用于织物的整理.经过处理的棉织物对紫外线的阻隔率明显提高,紫外线防护指数(UPF值)从来处理时的6.72增加到50以上,表现出优异的抗紫外线性能.     

Fabrication of a Polyamide/Polysulfone Hollow Fiber Composite Membrane

Introduction Appliedtomembraneseparationtechnology,components canbeseparatedmechanicallywhenasolutiongoesthrough asemipermeablemembrane.Themembranecanbesheet,spiralwound,tubeorhollowfiber,amongwhichhollow fiberisofthehighestspecificsurfaceandthusthemost effective.Thebestknownliquid phasemembraneprocessesare reverseosmosis(RO),ultrafiltration(UF),microfiltration(MF),dialysis,andelectrodialysis(ED).However,over thepastfewyears,anewmembraneprocesscalled nanofiltration(NF)hasemergedthatpromise…     

Structure and Properties of Polyurethane/Polyvinylidene Difluoride Blending Hollow Fiber

IntroductionMembrane with the property of pressure-responsibili-ty ,PR,is one kind of membranes , and the pores of thismembrane can be changed reversibly with pressure in a se-paration system. This thus provides the membrane with agreat deal of advantages . For example ,the first is that thePR membranes can separate different masses by varyingpressures relating to its varying pore sizes ,and the secondis the regeneration of a fouled PR membrane easily becausethe pores could be enlargedin cle…     

TiO2纳米晶的低温制备及其抗紫外线性能

采用溶胶-凝胶法,在低温条件下制备纳米TiO2,用X射线衍射（XRD）对其结构和粒径进行表征,并测试分析了纳米TiO2溶胶对紫外-可见光的透射和吸收特性．结果表明,制得的纳米TiO2为锐钛矿型纳米晶,粒子尺寸小于10nm.纳米TiO2溶胶在波长250-350nm的紫外光区透射率极小,在220-340nm区域出现强吸收峰．将制得的纳米TiO2制成整理剂用于织物的整理．经过处理的棉织物对紫外线的阻隔率明显提高,紫外线防护指数（UPF值）从未处理时的6．72增加到50以上,表现出优异的抗紫外线性能．     

聚氨酯杂化膜微孔结构形态的研究

采用添加SiO2的PU/溶剂铸膜液体系,通过热致相分离(TIPS)方法,制备了性能较好的PU杂化膜,测试了膜试样的水通量,并利用SEM观察了膜试样表面的微孔形态结构,使用分形数学方法时PU杂化膜表面的微孔结构进行了量化表征.结果表明:SiO2在PU杂化膜体系中的骨架材料作用明显,并且随着体系中SiO2用量的增加,分形维数变小,提高了膜表面微孔的分布均匀性;同时,增加了PU杂化膜的微孔数量、微孔之间的连通性及PU杂化膜的水通量.     

Effects of Phenolic Antioxidants on Ultra - high Molecular Weight Poly-ethylene/Decalin Solution

The degradation of ultra - high molecular weight polyethylene (UHMW- PE) during its dissolution into deca-lin is discussed. Also is discussed the stabilization of thesolution by three phenolic antioxidants, octadecyl β - (3, 5 - di - tert - butyl - 4 - hydroxyphenyl) propionate(1076), tetrakis[methylene β-(3,5-di-t-butyl-4- hydroxyphenyl) - propionate] methane(1010), 1,1,3-tris(2-methyl- 4- hydroxy- 5- tert-butylphe-nyl)butane (CA), and an auxiliary antioxidant.dilauryl-thio- dipropionate(DLTP). Among the three phenolic antioxidants, the effect of 1076 is the greatest) and the auxiliary antioxidant is effective in the stabilizing the solution when combined with one of the three phenolic antioxidants.     

Effect of Heat Treatment on Structures and Properties of Polyurethane Blend Ultrafiltration Membranes

IntroductionMembraneseparationisanewseparationprocessthatreplacesamajorityoftheconventionalseparationsystemsanditisnowwidelyusedinmanyindustrialareassuchasfoodandbeverage ,pulpandpaper,andtextileindustries.Polyurethane (PU )isoneofthenewmembranematerialsthathaveattractedincreasingattention[1] .K .Rzesautek[2 ] studiedtheextractionandtransportofvariousorganicdyesthroughthinether typePUmembranes.U .S .AithalandS .B .Harogoppao[3 ,4] studiedthediffusionortransportofsomeindustrialsolventsthrou…