温度和压力对六氟二酐型聚酰亚胺的透气性能的影响

本文研究了温度和压力对五种六氟二酐（６ＦＤＡ）型聚酰亚胺膜对Ｈ_２、ＣＯ_２、Ｏ_２、Ｎ_２和ＣＨ_４五种气体透过性能的影响．在３０－１００℃区间，五种聚酰亚胺的透气系数与温度的关系均符合Ａｒｒｈｅｎｉｕｓ关系式；在０．３－１．２ＭＰａ区间，压力对透气系数的影响很小．６ＦＤＡ－４，４＇－二氨基二苯酮（ＤＡＢＰ）和６ＦＤＡ－３，３＇－二甲基二苯甲烷二胺（ＤＭＭＤＡ）在１００℃仍然具有较大的透气选择系数，是比较好的气体分离膜材料．     

Copolymerization of Ethylene with lO-Undecen-l-ol Using Highly Active Vanadium（III） Precatalysts Bearing Bis（imino）pyrrolyl Ligands

The copolymerizations of ethylene with 10-undecen-1-ol have been investigated using vanadium precatalysts, bis（imino）pyrrolyl vanadium（Ⅲ） complexes 1-3, 2,5-C4H2N（CH=NR）2VCl2（THF）2 [R = C6H5 （1）, 2,6-iPr2C6H3 （2）, C6F5 （3）], and the iminopyrrolyl and b-diketiminate ones for comparison. The polar monomer was pretreated by diethylaluminium chloride （present also as the cocatalyst） before the copolymerization. The monomer reactivity ratios were evaluated using the Fineman-Ross method. The ligand structure considerably influenced the catalytic activity and tolerance towards the polar monomer, the polar monomer incorporation and the molecular weights of the resultant copolymers. The bis（imino）pyrrolyl vanadium complexes exhibited promising catalytic performance for the copolymerization, and a high catalytic activity up to 3.84 kg/mmolv·h with a high comonomer incorporation of 14.0 mol% was achieved by complex 3 under mild conditions.     

火焰原子吸收法测定山楂叶中钙、锰、铁、锌、镁、铜、铅、铬的含量

对广西山楂叶进行湿法消化处理,利用火焰原子吸收分光光度法测定了其中微量元素的含量。结果表明,山楂叶中含有较丰富的Ca、Mg、Fe、Mn。该法的加标回收率为99．6％～105．0％,RSD≤0．71％,测定结果准确。     

共沉淀法制备不球磨稀土磷酸盐绿色荧光粉研究

报道了共沉淀法制备LaPO4:Ce,Tb绿色荧光粉的工艺。运用热分析仪，X射线衍射仪，光谱仪和激光粒度仪对其差热、结构、发射光谱和粒度进行了研究。结果表明：该法制得的LaPO4:Ce,Tb绿色荧光粉灼烧温度低，无杂相，颗粒适中，不需球磨可直拉用于涂管。     

含铵根离子等规聚丙烯离聚体的合成及性能研究

合成了一系列高分子量、窄分子量分布且高等规度,含有不同―NR_3~+X~-离子基团含量的聚丙烯离聚体(iPP-NR_3~+X~-).以PP/IUD共聚物作为反应中间体,与三乙胺或N-甲基咪唑氨化得到聚丙烯离聚体.通过离子交换反应制备不同反离子的N-甲基咪唑聚丙烯离聚体,包括双三氟甲基磺酰亚胺根离子(Tf_2N~-)、四氟硼酸根离子(BF_4~-)和六氟磷酸根离子(PF_6~-).热重分析结果发现N-甲基咪唑聚丙烯离聚体的热稳定性明显优于三乙胺聚丙烯离聚体,表明不含β-H的N-甲基咪唑聚丙烯离聚体具有较高的热稳定性.同时,聚丙烯离聚体的表面亲水性得到明显改善.并且,聚丙烯离聚体的断裂伸长率也得到显著提高,最高达到900%.比较不同反离子聚丙烯离聚体的屈服强度和断裂强度发现I~-聚丙烯离聚体具有最优的力学性能.     

Synthesis of functional polyethylene <Emphasis Type="Italic">via</Emphasis> copolymerization of ethylene and substituted allene using bis(<Emphasis Type="Italic">β</Emphasis>-enaminoketonato)titanium catalysts

Novel copolymerization of ethylene with substituted allenes（CH₂=C = CH—R,1:R = n-butyl,2:R =n-octyl） using bis（β-enaminoketonato）titanium catalysts[PhN = C（R₂）CHC（R₁）O]₂TiCl₂（1a:R₁ = CF₃,R₂ = CH₃;1b:R₁ = Ph,R₂ = CF₃） has been investigated.In the presence of modified methylaluminoxane,these catalysts can copolymerize ethylene with substituted allenes,affording copolymers with unimodal molecular weight distributions and homogeneous compositions.By varying the reaction conditions,the comonomer incorporation can be tuned in the range of 0-3.6 mol%.¹H-NMR spectra reveal that the copolymerization proceeds through 1,2-insertion fashion of allene comonomer exclusively,and the regioselective nature maintains under various reaction conditions.The retained intra-chain double bond can be converted into the epoxy group under mild conditions.     

Ethylene/1-hexene copolymerization by salicylaldiminato vanadium(III) complexes activated with diethylaluminum chloride

Mono salicylaldiminato vanadium（Ⅲ） complexes（1a-1f）[RN = CH（ArO）]VCl₂（THF）₂（Ar = C₆H₄（1a-1e）,R = Ph,1a;R = p-CF₃Ph,1b;R = 2,6-Me₂Ph,1c;R = 2,6-iPr₂Ph,1d;R = cyclohexyl,1e;Ar = C₆H₂tBu₂（2,4）,R = 2,6-iPr₂Ph, 1f） and bis（salicylaldiminato） vanadium（Ⅲ） complexes（2a-2f）[RN = CH（ArO）]₂VCl（THF）_x（Ar = C₆H₄（2a-2e）,x = 1 （2a-2e）,R = Ph,2a;R =p-CF₃Ph,2b;R = 2,6-Me₂Ph,2c;R = 2,6-iPr₂Ph,2d;R = cyclohexyl,2e;Ar = C₆H₂tBu₂（2,4）,R = 2,6-iPr₂Ph,x = 0,2f） have been evaluated as the active catalysts for ethylene/1-hexene copolymerization in the presence of Et₂AlCl.The ligand substitution pattern and the catalyst structure model significantly influenced the polymerization behaviors such as the catalytic activity,the molecular weight and molecular weight distribution of the copolymers etc.The highest catalytic activity of 8.82 kg PE/（mmol_V·h） was observed for vanadium catalyst 2d with two 2,6-diisopropylphenyl substituted salicylaldiminato ligands.The copolymer with the highest molecular weight was obtained by using mono salicylaldiminato vanadium catalyst 1f having ligands with tert-butyl at the ortho and para of the aryloxy moiety.     

氯化3-氰-2-羟丙基三甲铵的拆分

研究了利用N-乙酰-L-谷氨酸为拆分试剂，成功的对氯化3-氰-2-羟丙基三甲胺进行光学拆分，一次拆分光学纯度为92％，产率为37％；二次拆分光学纯度达95％，产率为29．1％。     

二氧化锰添加剂对莫来石相发育及性能影响

以氧化铝和二氧化硅作为原料,二氧化锰作为添加剂,在烧结温度1300℃时,研究了不同二氧化锰添加量制备所得试样的结构和性能,通过对试样物相组成、显微结构、体积密度、显气孔率和抗折强度五方面的分析,研究了二氧化锰作为添加剂对莫来石相的形成、发育和性能的影响,并分析了莫来石相形成和发育过程中二氧化锰的作用机理.结果表明:MnO2的添加能促进固相烧结反应,降低烧结温度,抑制石英相的生长,促进莫来石相的形核和发育.同时在烧结过程中Mn4+能够加快晶粒生长.     

2',5'-二氢-1'H-吡咯骈[3',4':1,2][60]富勒烯衍生物的合成

以甘氨酸乙酯盐酸盐与取代的苯甲醛为原料,制得了一系列亚胺,然后用亚胺与C60反应,得到带有不同取代基的吡咯烷骈[60]富勒烯衍生物.经1H NMR,13C NMB,FT-IR,UV-vis以及TOF-SIMS等方法对所得化合物结构进行了表征,并进行了产物的生物活性测试.