1,6-己二醇二丙烯酸酯和苯乙烯多单体熔融接枝制备长支链聚丙烯研究

采用哈克转矩流变仪制备了1,6-己二醇二丙烯酸酯(HDDA)和苯乙烯(St)多单体熔融接枝聚丙烯(PP)体系.红外测试结果表明St的加入能够促进HDDA接枝到PP主链,提高接枝率.动态流变行为研究结果也表明采用多单体熔融接枝PP更有利于体系在熔融接枝中生成长支链(LCB).随着St单体添加量的增加,HDDA的接枝率增大...     

YAG:Ce荧光粉体的柠檬酸盐分解法制备和表征

通过对柠檬酸盐分解法的改进,在800℃的低温下合成了YAG:Ce立方晶荧光粉体,用X-射线衍射法研究了YAG的成相过程。结果表明:Y2O3与Al2O3的摩尔比为3.3:5时更易形成YAG相,成相过程是由无定型态直接转变为YAG相的。同时考察了样品的发光性质。     

可保眼滴眼凝胶和素高捷疗眼膏中小分子肽类的对比分析

通过采用先进的凝胶渗透色谱(GPC)和凝胶过滤色谱(GFC)方法,分析了素高捷疗眼膏和可保眼滴眼凝胶中小分子肽的相对分子质量和紫外吸收特征,证明两者确实含有一种相对分子质量约为1 900的小分子肽类生长因子,并且相对分子质量相同。     

Versify-g-(MAH-co-St)对改善PA6/Versify共混物增韧和均衡其力学性能的影响

使用挤出机对乙丙共聚物Versify2300(乙烯含量12wt%)(V-2300)进行马来酸酐(MAH)和苯乙烯(St)多单体熔融接枝得到接枝物Versify-g-(MAH-co-St)(g-V-2300).通过SEM、FTIR和力学性能测试,研究了g-V-2300对PA6/(V-2300+g-V-2300)(70/30)共混物形态和性能的影响.研究结果表明,随着g-V-2300含量的提高,V-2300分散相粒径不断减小且分散均匀.当g-V-2300比例为25wt%时,分散相尺寸只有0.27μm,此时共混物的izod冲击强度达到324.54J/m,为PA6/(V-2300+g-V-2300)(70/(30+0))共混物的16倍.g-V-2300的加入,显著改善了PA6/(V-2300+g-V-2300)(70/30)共混物的冲击强度,其伸长率,拉伸强度和抗弯强度也得到提高,从而得到具有均衡力学性能的增韧尼龙6合金.     

Syntheses,Characterization,and Crystal Structures of Three New Divalent Metal Sulfonates

Reactions of M（Ⅱ） acetate （M = Cu, Ni） with disodium 4,4＇-biphenyldisulfonate （BPDS） and 2,2＇-bipyridine （2,2＇-bipy） yielded three new metal sulfonates formulated as {[Cu2（2,2＇-bipy）2（H2O）（C2O4）（BPDS）]·2H2O}n 1, [Cu（2,2＇-Bipy）（H2O）3]（BPDS）＇2H2O 2 and [Ni（2,2＇-Bipy）（H2O）4]（BPDS）·2.5H2O 3. These three compounds were characterized by elemental analyses, FT-IR spectra, TG-DTA analyses and single-crystal X-ray diffraction analyses. Compound 1 belongs to the monoclinic system, space group P21/c with a = 17.7942（2）, b = 10.1369（10）, c = 19.8681（3） A, β = 104.323（10）°, V = 3472.20（7）A3, Mr = 893.82, Z = 4, F（000） = 1824,μ（CuKa） = 3.295 mm-1, R = 0.0427 and wR = 0.1278. Compound 2 is of orthorhombic system, space group Pca21 with a = 20.1016（7）, b = 7.2460（2）, c = 17.4802（6）A, V= 2546.10（14）A3, Mr = 622.11, Z= 4, F（000） = 1284,μ （CuKα） = 3.314 mm-1, R = 0.0415 and wR = 0.1291. Compound 3 belongs to the monoclinic system, space group C2/c with a = 15.9204（5）, b = 11.7511（4）, c = 15.2559（4）A, β = 98.886（3）°, V = 2819.85（15）A3, Mr = 1288.60, Z = 2, F（000） = 1340,μ（CuKa） = 2.957 mm^-1, R = 0.0515 and wR = 0.1454. Compound 1 is composed of one-dimensional helical chains of [Cu2（2,2＇-bipy）2（H2O）（C2O4）]2＋ fragments bridged alternately by 4,4＇-biphenyldisulfonate ligands, along the c axis of the unit cell. In compound 2, 4,4＇-biphenyldisulfonate anions are arranged in a zigzag mode and interact with the lattice waters via hydrogen bonds resulting in the formation of infinite chains. Adjacent chains are linked by lattice waters to form 2D extended sheets. The complex cations are located in the interlayer regions and interact with the sheets through hydrogen bonds. In compound 3, the Ni center resides at a crystallographic inversion center and adopts a distorted octahedral coordination sphere. The complex cations interact with 4,4＇-biphenyldisulfonate     

分光光度法测定铝合金中的微量铜

介绍了有机试剂5-甲基-3-对乙氧苯基-2-硫代乙内酰脲与Cu2 的络合反应.研究发现,在pH5.91的KH2PO4-Na2HPO4的缓冲溶液中,Cu2 与该试剂形成1:3的络合物,其最大吸收峰位于292.0nm处,摩尔吸光系数ε292.0nm=2.5×104L·mol-1·cm-1,Cu2 浓度在0-30μg/25mL范围内呈线性关系,相关系数r=0.9987.该法操作简单,选择性高,已满意地用于铝合金中微量铜的测定,回收率为97.8%-98.0%.     

偏高岭土水热合成NaY分子筛的机理研究

采用茂名高岭土水热合成NaY分子筛,用IR,XRD,NMR,SEM,HRTEM等分析了其晶化过程。结果表明：偏高岭土水热合成Y型分子筛是固相转变机理,晶化过程是一个扩散-成胶-原位重排的过程。     

Syntheses, Structures, and Some Properties of Three Vanadium Selenites

Three novel vanadium selenites with the formulae [（VO2）（1,10-phenanthtoline）（SeO3H）]2 1, [（VO2）（2,2′-bipyridine）]2（SeO3） 2 and [（VO）（H2O）（SeO3）2]2（HaEDD） 3 （EDD = N1,N1′-（ethane-1,2-diyl）diethane-1,2-diamine） were hydrothermally synthesized, and characterized with elemental analysis, FT-IR spectrum, Raman spectrum, TG-DTA analysis, EPR spectra, and single-crystal X-ray diffraction analysis. Compound I belongs to the triclinic system, space group P1^- with a = 7.7527（5）, b = 9.5345（10）, c = 9.8192（8） A^°, α = 92.712（3）, β = 105.540（3）, γ = 108.154（4）°, V = 657.66（1） A^°^3, Mr = 782.22, Z = 1, F（000） = 384,μ（MoKa） = 3.544 mm^-1, R = 0.0432 and wR = 0.1142; Compound 2 is of orthorhombic system, space group F212121 with a = 7.6574（15）, b = 14.916（3）, c = 19.085（4） A, V = 2179.8（8） Aa, Mr = 605.21, Z = 4, F（000） = 1200, μ（MoKa） = 2.579 mm^-1, R = 0.0338 and wR = 0.0658; Compound 3 belongs to the triclinic system, space group P1^- with a = 9.247（2）, b = 9.659（2）, c = 7.2651（19） A^°, α = 98.171（7）, β = 103.709（5）, γ = 114.712（13）°, V = 550.9（2） A^°^3, Mr = 828.03, Z = 1, F（000） = 400, μ（MoKa） = 7.537 mm^-1, R = 0.0641 and wR = 0.2118. Compound 1 is constructed from alternating corner-shared [VO4N2] octahedra and SeO3H units, forming a dimeric vanadium unit. These assemblies are further linked into an infinite chain via hydrogen bonds along the a axis. In the structure of 2, two distinct V centers form centrosymmetric [V2O6N4] clusters through edge-sharing, and the SeO3 unit serves as a capping unit to fix the oxovanadate cluster. In the structure of 3, each [VO6] octahedron shares four oxygen atoms with adjacent Se atoms, while every SeO3 unit shares two oxygen atoms with neighboring V atoms. This connectivity of alternating VO6 and SeO3 units results in a joint-like chain. Based on the TGA analysis, these three compounds are thermally stable under 200℃ .