热致液晶共聚酯／Nylon－1010共混物的研究

利用偏光显微镜（ＰＬＭ），差示扫描量热计及广角Ｘ－射线衍射等手段研究了热致液晶共聚酯／Ｎｙｌｏｎ－１０１０共混体系．发现当热致液晶共聚酯（ＨＴＨ１０）含量达到３０％时共混物微结构与纯ＨＴＨ１０相似．尼龙－１０１０的结晶度先是随ＨＴＨ１０含量增加而增加，随后又随之下降，但其结晶温度却随ＨＴＨ１０加入而单调下降，共混物的熔融热焓△Ｈｍ在ＨＴＨ１０含量为３０％时与计算值有较大的偏差，广角Ｘ－射线衍射结果表明，此时共混物结构发生了较为明显的变化，两组份之间在此时存在一定的相互作用．     

APPLICATION OF THE MOMENT METHODS TO ANALYSIS OF X-RAY DIFFRACTION LINE PROFILE FOR PA1010-BMI SYSTEM

Pure X-ray diffraction profiles have been analysed for polyamide 1010 and PA1010--BMI system by means of multipeak fitting resolution of X-ray diffraction.The methods ofvariance and fourth moment have been applied to determine the particle size and strainvalues for theparacrystalline materials.The results indicated that both variance and fourthmoment of X-ray diffraction line profile yielded approximately the same values of theparticle size and the strain.The particle sizes of(100)reflection have been found todecrease with increasing BMI content,whereas the strain values increased.     

聚（β－羟基丁酸酯）／聚双酚A羟基醚共混体系相容性及结构的研究

ＤＳＣ和ＦＴＩＲ测试表明，结晶／非晶共混体系聚（β－羟基丁酸酯）（ＰＨＢ）／聚双酚Ａ羟基醚（ＰＢＨＥ）是部分相容的．熔融结晶退火可以大大提高共混物的结晶度，增加其相容性，７５／２５组分ＰＨＢ相结晶度最大，５０／５０组分（０２０）、（１３０）晶面微晶尺寸最大．ＳＡＸＳ研究表明，纯ＰＨＢ的中间层约为１．５ｎｍ，片层厚约４．０ｎｍ；共混物的中间层在２．０ｎｍ左右，片层厚在５．０—７．２ｎｍ之间，５０／５０组分片层最厚．７５／２５组分晶相和非晶相的密度差最大．     

阳离子聚合合成聚苯乙烯大分子单体

<正> 近十年来,对大分子单体的合成和表征进行了较广泛的研究,其中尤以聚苯乙烯大分子单体研究得更多。Milkovich等用阴离子聚合合成了一系列具有不同端基的大分子单体。本文采用实验要求比阴离子简单的阳离子聚合方法,用对-氯甲基-β-溴乙苯和三     

An Abietane Diterpene and a Sterol from Fungus Phettinus igniarius

A new abietane diterpene 12-hydroxy-7-oxo-5, 8, 11, 13-tetraene-18, 6-abietanolide, together with a new natural sterol stigmasta-7, 22-diene-3β, 5α, 6α-triol have been isolated from the fruiting body of the fungus Phellinus igniarius. Their structures were elucidated by spectroscopic methods including 2D NMR techniques.     

反胶束模板制备聚甲基丙烯酸甲酯/无机纳米粒子/石墨纳米复合材料及其表征

以甲基丙烯酸甲酯(MMA)和三氯甲烷(CHCl₃)为油相制备反胶束微乳液, 依靠表面活性剂十六烷基三甲基溴化铵(CTAB)自组装形成的“微反应器”作为模板成功地制备了PMMA/Eu(OH)₃/EG和PMMA/Ni(OH)₂/EG纳米复合材料. 并用红外光谱(IR)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和差热-热重(TG-DTA)对该复合材料进行了表征和分析. 研究结果表明, 反胶束法可以有效地应用于有机-无机纳米复合材料的制备.     

A New Amperometric Glucose Biosensor with Naphthol Green B as Mediator

Naphthol green B was used, for the first time, as a new mediator in an amperometric glucose biosensor. It is a good mediator, promoting electron transfer from glucose oxidase to graphite electrode. The biosensor shows high sensitivity to glucose at low potential with response time of 30 seconds. The linear range is from 1.5 to 18μmol/L glucose with detection limit of 0.5μmol/L glucose.     

Photophysics properties of 4-formacyl-triphenylamine and 4,4''''-bisformacyl-triphenylamine

The photophysical processes of 4-formacyl-triphenylamine (FTA) and 4,4'-bisformacyl-triphenyl-amine (BTA) have been studied. The fluorescences of FTA and BTA with donor (triamine) and acceptor (formacyl) moieties show the twisted intramolecular charge transfer (TICT) emission in polar solvents and photoinduced charge transfer (ICT) emission in nonpolar solvents. These could be supported by the solvent effect, temperature effect and the quenching process by strong electron-deficient compounds.     

X-射线衍射法测定尼龙1010结晶度

根据X-射线散射强度理论,使用图解多重峰方法对尼龙1010三个结晶峰及非晶峰的衍射强度进行校正,首次导出了尼龙1010结晶度计算公式,所得结果与密度及量热测定结果具有很好可比性。     

氧化羰化法合成碳酸甲乙酯热力学及催化性能的研究

研究了在甲醇、乙醇温和溶液中,氧化羰化一步合成不对称碳酸甲乙酯(MEC)反应。通过热力学计算考察了反应的可行性及程度。计算结果表明,在298.2K下主反应平衡常数为2.39×1080,说明此反应的可行性和程度均很大。实验发现在氧化羰化合成碳酸甲乙酯的过程中,不仅存在氧化羰化过程,同时也存在酯交换过程;含氮席夫碱(Schiff)的种类,甲醇和乙醇相对用量,反应温度和压力对碳酸甲乙酯(MEC)的合成均有影响。当以氯化亚铜(CuCl) 1,10 菲罗啉(phen) N 甲基咪唑(NMI)为催化剂时,摩尔比n(CuCl)∶n(NMI)∶n(phen)=1∶1.25∶1.25,在393K,2.4MPa,VMeOH∶VEtOH=2∶8,CuCl浓度为0.20mol L的条件下,反应2h,甲醇的转化率为44.3%,乙醇的转化率为22.3%,MEC产率为10.4%。与单纯CuCl催化剂相比,甲醇和乙醇的转化率分别提高17倍和9倍,MEC产率提高74倍。对氧化羰化反应机理也进行了探讨。