丁腈橡胶/聚氯乙烯共混型纺化纤胶圈胶料的研制

丁腈橡胶（ＮＢＲ）／聚氯乙烯（ＰＶＣ）共混型纺化纤胶圈胶料可通过调整增塑剂ＤＢＰ用量（２５份）、白炭黑用量（５份）使ＮＢＲ／ＰＶＣ之比达１００／８０，而胶料的拉伸强度、扯断伸长率、３００％定伸应力等均较好，邵尔Ａ型硬度达到控制指标（７２度）。胶料的挤出条件为：挤出机机头温度７０—８０℃，螺杆转速３５ｒ·ｍｉｎ－１．     

邻苯二甲酸二丁酯研究概述

介绍了邻苯二甲酸二丁酯(DBP)的合成工艺和催化剂的选择,主要对不同催化剂合成DBP方法进行了评述。建议对现有的有实用价值的催化剂进行深入试验和筛选,并开发新型催化剂。     

惰性气体对高真空蒸发与冷凝过程的影响

采用Bhatnagar Gross Krood(BGK)模型方程,建立了计算多组分稀薄气体流动的数学模型和求解方法。应用该模型对邻苯二甲酸二丁酯(DBP)和癸二酸二丁酯(DBS)物系在有惰性气体存在条件下的一维蒸发和冷凝过程进行了数值模拟,考察了各操作工艺参数对该过程的影响。研究结果表明惰性气体分压远大于蒸发液体的饱和蒸气压时,蒸发效率趋近于零;升高蒸发温度、冷凝温度以及增大蒸发面和冷凝面之间的距离都将使得蒸发效率降低,其中冷凝温度的升高将使蒸发效率显著减小。     

纸杯中有机模拟污染物分配系数的研究

以3种纸杯样品为研究对象,使用微量点滴样法研究了有机模拟污染物邻苯二甲酸二丁酯(DBP)、二苯甲酮在纸杯样品和空气间的分配系数(Kpaper/air)。研究发现,分配系数值随着温度的升高而减小。70℃时,DBP、二苯甲酮的Kpaper/air值范围分别为105.723~1638.894和67.469~991.849;而100℃时Kpaper/air值范围分别为28.661~360.978和7.506~407.225。Kpaper/air值不仅与污染物的沸点有关,还与纸杯样品的厚度、定量及紧度有很大的关系,厚度、定量、紧度越大,分配系数越大,纸杯样品中的DBP越不易发生迁移。     

增塑剂对聚合物电解质膜性能的影响

为了研究聚合物锂离子蓄电池制备过程中增塑剂邻苯二甲酸二丁酯(DBP)对聚合物电解质膜性能的影响,采用交流阻抗法、扫描电镜SEM、拉伸强度测试等实验方法和手段,针对不同增塑剂DBP的添加量对聚合物电解质膜的微观结构、力学性能、吸附性能以及电导率的影响进行了系统的研究和分析。研究结果表明,当聚偏氟乙烯-六氟丙烯的共聚物(PVDF-HFP)与DBP比例为1∶2(质量百分比)左右时聚合物电解质膜具有较好的性能,吸液量290%,拉伸强度0.83MPa,电导率1.12×10-3S·cm-1。     

炭黑湿法造粒工艺及其控制

阐述了2万t/a湿法造粒硬质炭黑的成粒机理及工艺过程控制。并对与炭黑DBP吸收值、吸碘值、灰分有关的因素进行了分析、探讨,以其达到最佳的造粒效果。     

邻苯二甲酸二丁酯对蓝藻生长的影响

研究了邻苯二甲酸二丁酯（DBP）对鱼腥藻PCC7120生长的影响。结果表明，在培养基中加入少量DBP对蓝藻的生长有一定的刺激作用，但随着DBP加入量的增大，藻的生长逐步受到抑制，直至衰亡。通过测定叶绿素a（chla）、可溶性蛋白、三磷酸腺酐（ATP）、超氧化物歧化酶（SOD）、还原型谷胱甘肽（GSH）、过氧化物酶（POD）等生长代谢指标．发现藻液中加入少量的DBP对鱼腥藻PCC 7120的生长产生了影响。延缓了其衰亡。     

Performance improvement of DBP-based solar cells by introducing a luminescent sensitizer bis[(4,6-difluorophenyl)-pyridinato-N,C2′]c(picolinate)iridium(III) (FIrpic)

In this work,a sky-blue luminescent down-shifting(LDS)layer bis[(4,6-difluorophenyl)-pyridinato-N,C^2']c(picolinate)iridium(II)(FIrpic)was inserted between tetraphenyl dibenzoperiflanthene(DBP)and Mo0₃as UV-screen and sensitizer for smallmolecule DBP/C₆₀based planar heterojunction(PHJ)solar cells.With 8-nm Flrpic theshort circuit current(J_sc)and power conversion efficiency(PCE)of the device areenhanced by 28%and 15%,respectively,probably originating from the re-absorption ofthe photons emitted from Flrpic.The V_oclinearly increases over 1-nm Flrpic,ascribed tothe deeper HOMO level of Flrpic than DBP,while the fill factor continuously declines from 3-to 10-nm Flrpic.The EQE spectra prove that the J_scis mainly contributed by thephotocurrent generated in DBP and C₆₀layers.When the FIrpic thickness is 8 nm,the filmsurface is very uniform with the smallest water contact angle.The impedance spectro-scopy demonstrates that the device resistance gradually increases from 4.1×10⁴Ω(without Flrpic)to 4.6×10⁴Ω(with 10-nm Flrpic)with the FIrpic thickness rise,simultaneously the device transits from the insulating state into the conductive statefaster for the thin Flrpic layer than the thick layer.     

The DNA Sequence of Cosmid 14–13b from Chromosome XIV of Saccharomyces cerevisiae Reveals an Unusually High Number of Overlapping Open Reading Frames

This work is part of the effort for sequencing chromosome XIV of Saccharomyces cerevisiae. Cosmid 14–13b contains a 37·8 kb insert derived from a partial Sau3A digestion of the genome, cloned into the BamHI site of the vector Pou6. The strategy used for sequencing is based on the fragmentation of the whole cosmid by sonication, followed by shotgun sequencing on an Applied Biosystem DNA sequencer. The clones with inserts corresponding to the vector were identified by dot-blot hybridization, without the need of sequencing. The analysis of the DNA sequence reveals 29 open reading frames (ORFs) longer than 300 bases. Nine ORFs are internal to some other ORFs. Similarity searches against DNA and protein data banks show that six ORFs correspond to already known yeast genes (OMP1, PSU1, MLS1, RPC19, DBP2, CYB5) and one ORF matches the sequence of a putative yeast gene (ESBP6). The cosmid sequence has been submitted to the EMBL data bank under Accession Number Z69382.©1997 John Wiley & Sons, Ltd.     

DBP降解菌的降解动力学及代谢途径研究

以实验室保存的1株Elizabethkingia sp.W8为研究对象,对其降解DBP的条件、动力学特性及代谢途径进行了研究。结果表明,该菌株的较优生长条件为：温度35℃,pH=7.0,盐浓度0.5%。当DBP的初始浓度介于50～400mg/L时,该菌株对DBP的降解符合Monod一级反应动力学模型。红外光谱分析结果显示,W8对邻苯二甲酸二丁酯的降解很可能为DBP→MBP→PA代谢路径。