介孔分子筛SBA-15的脂肪酶固定量分析测定

利用吸附法将假丝酵母脂肪酶(candida rugosa lipase,CRL)固定在介孔分子筛SBA-15上,对比了由单波长紫外分光光度法、双波长紫外分光光度法和二辛可宁酸法(bicinchoninic acid method, BCA)法测定的酶蛋白浓度及酶蛋白固定量.结果表明: SBA-15对紫外吸收有明显干扰,单波长紫外法测定结果远大于双波长紫外法和BCA法,双波长紫外法和BCA法测定结果较接近.利用BCA法测定了不同浓度CRL在介孔分子筛上的固定量,考察了固定化酶的泄漏量.在编号分别为Lu001和LLSD1的介孔分子筛SBA-15上的载酶量分别为16.6和114.12 mg/g.在缓冲溶液中SBA-15固定化酶的泄漏率只约为0.5%,可作为良好的酶固定化载体.     

SUPER POLYOLEFIN BLENDS ACHIEVED VIA DYNAMIC PACKING INJECTION MOLDING:MORPHOLOGY AND PROPERTIES

As a long-term project aimed at developing super polyolefin blends, in this paper we summarize our work on themechanical reinforcement and phase morphology of polyolefin blends achieved by dynamic packing injection molding(DPIM). The main feature of this technology is that the specimen is forced to move repeatedly in the model by two pistonsthat move reversibly with the same frequency during cooling, which results in preferential orientation of the dispersed phaseas well as the matrix. The typical morphology of samples obtained via DPIM is a shear-induced morphology with a core inthe center, an oriented zone surrounding the core and a skin layer in the cross-section areas. Shear-induced phase dissolutionat a higher shear rate but phase separation at low shear rates is evident from AFM examination of LLDPE/PP (50/50) blends.The super polyolefin blends having high modulus (1.9-2.2 GPa), high tensile strength (100-120 MPa) and high impactstrength (6 times as that of pure HDPE) have been prepared by controlling the phase separation, molecular orientation andcrystal morphology.     

氧化锌薄膜的可控浸润性研究

采用一步电沉积的方法在导电玻璃基底上制备了具有粗糙表面的氧 化锌薄膜．用SEM和XPS表征了薄膜的表面形貌和化学组成,用接触角测定仪 测定接触角以评估薄膜的浸润性．结果显示,薄膜表面布满了无序生长的花瓣状 的微晶,形成疏松的结构．薄膜与水的接触角为133．2°,呈现了疏水的性质．通 过紫外光照射的方法可以使其由疏水性薄膜转化为亲水性薄膜,接触角降低到 4．8°。     

士的宁分子印迹整体柱的制备

以士的宁为模板分子，甲基丙烯酸为功能单体，乙二醇二甲基丙烯酸酯作为交联剂，甲苯和十二醇混合溶液为致孔剂，用原位分子印迹技术，合成了士的宁分子印迹整体柱。通过优化合成条件，结果显示：模板分子、功能单体与交联剂之间的比例以1：4：16最佳，致孔剂中甲苯的最佳含量为18％（V/V)；对士的宁整体柱的色谱条件包括流动相组成、流速、柱温等进行了考察，并用于士的宁和马钱子碱的分离，其分离因子为3．5。     

PREPARATION OF HIGH-TEMPERATURE VULCANIZED SILICONE RUBBER OF EXCELLENT MECHANICAL AND OPTICAL PROPERTIES USING HYDROPHOBIC NANO SILICA SOL AS REINFORCEMENT

Hydrophobic nano silica sol(HNSS)was incorporated into polyvinylmethylsiloxane to prepare reinforced high- temperature vulcanized(HTV)silicone rubber.HTV silicone rubber filled with 40 phr HNSS showed excellent mechanical and optical properties:the tensile strength reached 11.7 MPa and the optical transmittance was higher than 90%.Possible reasons for reinforcement and transparency were discussed on the basis of the bound rubber percentage,total crosslink density,and SEM analysis.Our work suggests that H...     

FRACTIONATED CRYSTALLIZATION OF HDPE IN PS/POE/HDPE/SBS BLENDS

The fractionated crystallization behavior of the minor dispersed HDPE phase in PS/POE/HDPE/SBS quaternary blends was investigated by differential scanning calorimetry (DSC).Interestingly,we found that the fractionated crystallization behavior of HDPE was molecular weight dependent.At a fixed composition,HDPE with lower molecular weight showed more obvious fractionated crystallization behavior than HDPE with higher molecular weight.This was ascribed to a finer dispersion of HDPE with lower molecular weigh...     

离子束技术和薄膜功能材料研究

总结了武汉大学物理系加速器实验室近年来在离子束技术和薄膜功能材料研究方面的主要成果，包括：大型离子束及薄膜研究设备的建造和改进，非晶合金、高温超导、Ｃ６０、β－Ｃ３Ｎ４等多种新型薄膜功能材料的离子束合成和材料改性研究．这是近１０年来薄膜功能材料最前沿的研究课题，这些研究工作具有一定的特色，并取得诸项阶段性成果     

Effect of melt temperature on the phase morphology, thermal behavior and mechanical properties of injection-molded PP/LLDPE blends

<正>The phase morphology and thermal behavior of various isotactic polypropylene(PP)/linear low density polyethylene(LLDPE) blends were investigated with aid of scanning electron microscopy(SEM) and differential scanning calorimetry(DSC),respectively.The effect of barrel(melt) temperature on the morphology,thermal behavior and the resultant mechanical properties of the injection molded bars was the research focus,and the influence of LLDPE composition was also taken into account.It was found that the mechanical properties,especially the tensile ductility and the impact strength,were greatly affected by the processing temperature.The samples obtained at low temperatures had the highest elongation at break and impact strength,while those molded at high temperatures had the poorest toughness.Two reasons were responsible for that:first,the phase size in the samples increased with the processing temperature;second, possible orientation existed in the samples obtained at low processing temperatures.     

GC法同时测定酚氨咖敏片中4种组分

建立了同时测定酚氨咖敏片中对乙酰氨基酚、氨基比林、咖啡因和马来酸氯苯那敏4组分含量的毛细管气相色谱法。采用SE-30大口径毛细管色谱柱(30 m×0.53 mm,1.0μm),柱温190℃,汽化室温度220℃,检测器为FID,检测温度250℃,载气为高纯N2,分流比为1∶6,内标为盐酸麻黄碱,以无水乙醇为溶剂,样品无需衍生化处理,直接进样测定。样品中各组分完全分离,辅料无干扰,对乙酰氨基酚、氨基比林、咖啡因和马来酸氯苯那敏分别在20~2000μg/mL、15~1500μg/mL、10~500μg/mL和20~100μg/mL范围内线性关系良好(r0.999),各组分的平均回收率在99.6%~101.2%范围内,RSD2%。     

用子波方法研究Rayleigh-Bénard对流温度信号的标度律

采用子波分析方法 ,对实验中测得的Rayleigh_B啨ｎａｒｄ对流温度信号 (被动标量 )的标度律 ,从以下两个方面进行了研究 :第一方面 ,直接采用扩展的结构函数 (ESS)的公式对温度信号进行了分析 ,研究结果表明 ,采用该方法后的标度区域明显比不采用扩展结构函数的标度区域要宽 ,得到的标度指数与其它实验中得到的温度信号标度指数 ξ(q)一致 ;第二个方面 ,将 A .Arneodo等人对湍流中速度信号提出的基于子波分析的扩展标度公式 ,推广应用于温度信号 ,给出了一个描述温度信号的、基于子波分析的扩展标度公式 ,研究结果表明 ,提出的建立在子波系数极大模求和基础上的扩展标度公式 ,也能够比较准确地提取温度信号的标度指数 ξ(q) ·