Pluronic F68胶束水溶液对稠环芳烃的增溶

PluronicF6 8嵌段共聚物在 5 0℃的水溶液中可形成外壳良好水化的胶束 ,其内核组成中PO和EO的质量分数分别为 80 %和 2 0 %。该胶束和稠环芳烃的结合能力顺序为芘 >蒽 >萘。三者在F6 8胶束和水相间的分配系数KV 分别为 8 74× 10 2 (芘 )、7 94× 10 2 (蒽 )和 2 5 4× 10 2(萘 )。     

氯甲酸苄酯的合成及应用

对氯甲酸苄酯的合成进行了研究 ,介绍了其在多钛合成中的应用。     

甲基环戊二烯基三羰基锰的合成和应用进展

甲基环戊二烯基三羰基锰 (MMT)是一种有机锰油品抗爆添加剂 ,被认为是有机铅的最好替代物。国内对其研究较少 ,本文综述了MMT的物理性质、抗爆机理、合成工艺及其应用的研究进展 ,为其国产化提供信息     

CaCO_3粉末作载体固定化脂肪酶催化合成单甘酯

研究了以CaCO3 粉末为载体吸附法固定化脂肪酶的方法。结果表明 ,当酶的用量为CaCO3 质量的 0 3g g-1,吸附时间 1 5h ,所得固定化酶活最高 ,为 15 8 1UCaCO3/g min。研究了固定化酶催化棕榈油固相甘油解反应合成单甘酯工艺条件 ,结果表明 ,固定化酶加入量为 15 0U/g油 ,甘油与棕榈油摩尔比为 4∶1,甘油中水的含量为 4% ,于2 8℃反应 2 4h ,然后将反应体系的温度降至室温 ( 13℃～ 15℃ ) ,9天后单甘酯的含量达 33 4% ,该固定化酶很容易从反应体系中回收 ,重复使用 5次 ,酶活保留 73 37%     

Biodiesel Production Using a Carbon Solid Acid Catalyst Derived from β‐Cyclodextrin

A novel carbon solid acid catalyst was prepared by incomplete hydrothermal carbonization of β‐cyclodextrin into small polycyclic aromatic carbon sheets, followed by the introduction of –SO₃H groups via sulfonation with sulfuric acid. The physical and chemical properties of the catalyst were characterized in detail. The catalyst simultaneously catalyzed esterification and transesterification reactions to produce biodiesel from high free fatty acid (FFA) containing oils (55.2 %). For the as‐prepared catalyst, 90.82 % of the oleic acid was esterified after 8 h, while the total transesterification yield of high FFA containing oils reached 79.98 % after 12 h. By contrast, the obtained catalyst showed comparable activity to biomass (such as sugar, starch, etc.)‐based carbon solid acid catalyst while Amberlyst‐15 resulted in significantly lower levels of conversion, demonstrating its relatively high catalytic activity for simultaneous esterification and transesterification. Moreover, as the catalyst can be regenerated, it has the potential for use in biodiesel production from oils with a high FFA content.     

新世纪的新能源——天然气水合物

寻求洁净高效的新能源是近年来一个热门课题。世界各国投入了大量的资金和人力对其进行研究。最近,在天然气水合物（NGH）的基础研究、地质调查、勘探开发等领域取得了较大的进展。大多数科学家对开采利用天然气水合物这种清洁能源持乐观态度。     

Novel Series of Low‐Firing Microwave Dielectric Ceramics: Ca5A4(VO4)6 (A2+ = Mg,Zn)

Using a conventional solid‐state reaction Ca₅A₄(VO₄)₆ (A²⁺ = Mg, Zn) ceramics were prepared and their microwave dielectric properties were investigated for the first time. X‐ray diffraction revealed the formation of pure‐phase ceramics with a cubic garnet structure for both samples. Two promising ceramics Ca₅Zn₄(VO₄)₆ and Ca₅Mg₄(VO₄)₆ sintered at 725°C and 800°C were found to possess good microwave dielectric properties: ε_r = 11.7 and 9.2, Q × f = 49 400 GHz (at 9.7 GHz) and 53 300 GHz (at 10.6 GHz), and τ_f = ?83 and ?50 ppm/°C, respectively.     

航空子午线轮胎带束层胶料与纤维帘线粘合性能研究

研究航空轮胎带束层胶料配方对其与锦纶/芳纶复合帘线和芳纶帘线粘合性能的影响。结果表明,间-甲-白粘合体系可使胶料保持较大定伸应力和拉伸强度的同时提高芳纶帘线与胶料的粘合性能,此外间-甲粘合体系也可使锦纶/芳纶复合帘线与胶料有较好的粘合性能。粘合体系的发展使芳纶帘线在高性能要求的航空轮胎中应用成为可能。     

二氧化氯生产应用及开发前景

二氯化氯作为一种新型杀菌漂白剂,在欧美等发达国家已得到了广泛的应用,目前国内的应用正处于发展阶段.文章介绍了二氧化氯的特性、生产方法及多种用途,并对其开发前景进行了分析.     

高技术纤维研究进展

介绍了高技术纤维的研究开发以及国内外的发展动向 ,同时也对高技术纤维的用途作了简要的阐述