微波辐照下压力对合成苯乙烯——甲基丙烯酸甲酯纳米乳液的影响

 在微波辐照和有压力条件下,以过硫酸钾(KPS)为引发剂,苯乙烯(ST)、甲基丙烯酸甲酯(MMA)为共聚单体进行乳液聚合.在不同的压力下(从 0.4～0.8MPa)进行了聚合反应的研究.动态激光散射和透射电镜的结果都表明在上述条件下仅反应 10min,即可得到无皂纳米粒子胶乳,其平均粒子水化半径受压力影响较小.但压力对聚合转化率的影响较大,压力增加,转化率降低.而在通常加热的条件下用同样的配方,反应慢且无法得到纳米粒子胶乳.     

Female sex pheromone of the longhorn beetleMigdolus fryanus Westwood: N-(2′S)-methylbutanoyl 2-methylbutylamine

The first known long-range female-released sex pheromone for the family Cerambycidae is reported fromMigdolus fryanus, a sugarcane pest in South America. Although two female-specific compounds, namely, N-(2S)-methylbutanoyl 2-methylbutylamine and N-formyll-isoleucine methyl esters were identified, field tests with synthetic chemicals revealed that only the amide was active and that the amino acid derivative neither increased or decreased trap catches by the amide. This is the first identification of amide as a sex pheromone.     

Nitric oxide-dependent blood-brain barrier permeability alteration in the rat brain

The role of nitric oxide (NO), a well known vasodilator, in the regulation of blood-brain barrier (BBB) permeability is not clear. Therefore, the present study was planned to assess the role of NO-releasing compounds like sodium nitroprusside (SNP) and the active metabolite of molsidomine, SIN-1, as well as a precursor of NO, L-arginine, on this physiological barrier. The permeability was assessed by using several tracers. All three agents increased the permeability of BBB to the tracer. The increase in permeability caused by L-arginine was not blocked by N-nitro-L-arginine methyl ester (L-NAME). L-Arginine-treated brains did not show an elevation of nitrite content, thus ruling out the possibility of NO generation and its involvement in BBB permeability alteration. It is concluded that NO itself causes an increase in the permeability of BBB. However arginine-induced opening is not NO mediated.CDRI Communication Number: 5178.     

玻璃涂料的研制

此涂料是由苯乙烯,甲基丙烯酸甲酯,甲基丙烯酸的三元共聚物与有机溶剂,环氧树脂所组成,具有良好的附着力、硬度和耐化学腐蚀性。     

间接原子吸收光度法测定微量S^2—

研究了用间接原子吸收分光光度法测定微量S~(2-).在pH=4.5的含S~(2-)溶液中,加入定量过量的Cu~(2+),使其形成CuS沉淀,多余的Cu~(2+)用戊黄原酸钾配合,然后用甲基异丁基甲酮(MlBK)溶剂萃取配合物.不需分离,直接喷雾有机相溶液测定配合铜.S~(2-)的灵敏度为0.01μg/mL/1％,变动系数2.7％.     

醇盐法制备Cu—ZnO／SiO2催化剂及其活性

用醇盐法制备Cu-ZnO/SiO2催化剂，该催化剂在甲醇脱氢合成甲酸甲酯反应中的活性和稳定性均优于浸渍法和离子交换法制备的Cu-ZnO/SiO2催化剂，根据差示扫描量热图谱和程序升温还原图图的测定，研究了焙烧温度及还原温度对催化活性的影响，并对ZnO的助催化性能进行了研究。     

MBS和PVC／MBS的形态,结构与性能

本文研究了三元共聚物ＭＢＳ树脂和ＰＶＣＮＢＳ共混物的形态、结构及其相关性能。采用间歇加料法得到形态规整的核壳型树脂。改变三元组分比例和玻璃化转变温度（Ｔｇ）能大大影响ＰＶＣ增韧效果，当Ｂ＝４２％时Ｓ：Ｍ＝（３４～３０）：（２４～２８）为宜。ＤＳＣ测定结果表明：ＰＶＣ与ＭＢＳ的壳层ＰＭＭＡ能很好相容，从二相间的相容结构形态证实，共混物间形成良好的粘合界面层，通过透射电镜（ＴＥＭ）和扫描电镜（ＳＥＭ）观察到ＰＶＣＮＢＳ共混体系由脆性转变为韧性的结构形态和形貌特征，抗冲击值可由纯ＰＶＣ时的４ｋＪ／ｍ２增到ＭＢＳ１５份时的５０ｋＪ／ｍ２以上。     

用硫酸锰电生媒质微粒MnO＿2氧化甲苯

采用Ｐｂ－ＰｂＯ_２阳极，常温电解酸性Ｍｎ（Ⅱ）电解液，电生媒质微粒ＭｎＯ_２氧化甲苯为苯甲醛。探讨了电生媒质微粒ＭｎＯ_２的制备条件，在较佳条件下电流效率＞９０％。该电生媒质氧化甲苯为苯甲醛的选择性好，一次转化率可达５２％。还原后的Ｍｎ（Ⅱ）返回电解槽，电解再生微粒ＭｎＯ_２，可循环使用再次氧化甲苯。本方法具有较好的发展前景。     

丙烯腈制丙烯酸酯类的研究

本文叙述了以丙烯腈、甲醇、丁醇为原料合成丙烯酸甲酯和丙烯酸丁酯，经处理后，产品含量均大于９８％，并对反应条件及三废治理进行了有益的讨论．     

光活性胺的合成和拆分

利用Ｌｅｕｃｋａｒｔ反应，以５５％～８５％的产率由酮与甲酸铵反应制得了５种外消旋胺；并用（＋）－酒石酸为析解剂、以甲醇和甲醇／乙酸乙酯作重结晶溶剂，以好的产率分别把（±）－４－苯基－２－丁胺和（±）－１－苯基－２－甲基丙胺拆分得到它们的光学异构体．