人发角蛋白溶液成膜的结构与性能

研究了稳定的角蛋白溶液及角蛋白质膜的制备 ,并利用 SEM、DSC及力学性能测试等手段 。

溶液成膜的温度对聚对苯二甲酸乙二酯结晶度的影响

用溶液成膜是制备聚合物薄膜的常用方法之一。但是溶液成膜的条件,如成膜温度,溶液浓度等对半结晶聚合物结晶度的影响研究报道较少。制备聚对苯二甲酸乙二酯(PET)非晶态薄膜通常使用熔融热压其后淬火的方法。由于PET在熔点附近易于降解,在薄膜中产生气泡,因而很难制备较大面积的均一厚度的薄膜。

HPLC法测定盐酸特比萘芬成膜溶液的含量

目的建立以高效液相色谱法测定盐酸特比萘芬成膜溶液含量的方法。方法色谱柱为C18柱,流动相为四氢呋喃-四甲基氢氧化铵缓冲液-乙腈（20∶30∶50）,检测波长为280 nm,流速为1 mL/min,柱温为30℃,进样量为20μL。结果盐酸特比萘芬在2.04~10.2μg范围内进样量与峰面积呈良好的线性关系（r=0.999 7）;平均回收率为99.9%（RSD=0.7%）。结论本方法简便、准确、专属性强,可用于该制剂的质量控制。

等离子体处理对复合蛋白基成膜溶液性能的影响

该研究旨在探索不同时长等离子体(Plasma)处理对复合蛋白基成膜溶液性能的影响。为此,采用功率为30 W的大气压Plasma对WPI-NaCas-GLY复合成膜溶液分别进行0、5、10、15、20、30、40和60 min的低温等离子体处理,研究了处理期间成膜溶液的色度、p H值、粒度、表面张力、发泡性能和乳化能力的变化以及制得薄膜的机械性能、光学性能和阻隔性能的变化。实验结果表明,随着处理时间的延长,由于活性氧及氮物质的形成及作用,成膜溶液黄度提高,p H值先增后降,蛋白质聚合使得溶液中蛋白质大分子颗粒粒径以每5 min提高1倍的速率增长,蛋白质羰基增加1倍,游离巯基减少一半,基质表面张力降低至约35 m N/m,发泡能力降低10%,泡沫稳定性显著提升(P<0.05),由74.99%增至94.60%,乳化性能最高达到0.12 m^2/g。所得复合蛋白膜抗拉强度增大了0.5 MPa,透光率有所下降,氧气透过率降低至0.53 cc/(m^2·d),水蒸气透过系数降低约40%。由此推论,Plasma的适时处理能够有效改善蛋白基成膜溶液疏水性、发泡能力以及乳化性能,并得到较理想的复合蛋白膜。

羊毛角朊蛋白的再生利用技术

详细介绍了羊毛角朊和相关蛋白质再生纤维的应用研究现状,以及羊毛角朊再利用的可能性与研究,尤其是分析了氧化法和还原法对羊毛角朊蛋白的溶解过程,溶液成膜的机械性能和湿法纺丝的应用。指出了目前研究中存在的问题和羊毛角朊蛋白再生利用技术的发展前景。

傅里叶变换红外光谱法测定溴化丁基橡胶中硬脂酸钙含量

硬脂酸钙是溴化丁基橡胶中的一种重要添加剂。本文采用傅里叶变换红外光谱法,分别通过热压成膜和溶液成膜的样品制备方式,建立了测定溴化丁基橡胶中硬脂酸钙含量的方法。对两种样品制备方法进行了比较。结果表明,两种方法都有较高的准确度。热压成膜法制样简单适于工业样品的质量控制,溶液成膜法适于硬脂酸钙含量较高的样品。

介入疗法医用记忆合金支架高分子覆膜及加工方法研究

目的 研究一种为介入疗法所用的记忆合金支架被覆的高分子膜及其加工方法 ,旨在提高金属支架的生物相容性。方法 通过比较聚醚型聚氨酯、聚酯型聚氨酯、硅橡胶等材料 ,确定以聚醚型聚氨酯为原材料。该高分子覆膜分为内膜、外膜和微孔膜 ,采用注射溶液成膜的方法成膜。对于微孔膜 ,在成膜过程中加入成孔剂实现。结果 通过摸索得到了最佳的成膜的高分子溶液浓度 ,以及成微孔膜的成孔剂浓度 ,以及相应成膜工艺。结论 通过该工艺所得到的覆膜的金属支架弹性良好 ,所成的微孔膜孔隙率符合要求。所制备的覆膜支架正在进行动物实验。

Use of New Water Soluble Surface Film－Forming Material to Reduce Ammonia Loss from Water Solution

A new water soluble surfaCe film-forming material was developed and its effect on reducing ammonia volatilization from an alkaline solution was investigated in laborstory. Results showed that the new film formed by the material was not only more effective in reducing ammonia loss than any other films tested but also much cheaper. The optimum amount of addition of the new film-forming material was about 10times the theoretical amount to form a monomolecular film. Under the experimental conditions, the new film could effectively depress the ammonia volatilization for at least 6 days. The cumulative ammonia loss rates for different films were fitted to a simple logistic equation, and some important parameters such as the cumulative loss, and the maximum and average volatilization rates were calculated. The effect of different films could be, therefore, compared quantitatively, indicating the new film was most effective in depressing ammonia volatilization.

Synthesis and Separation Performance of Y-type Zeolite Membranes by Pre-Seeding Using Electrophoresis Deposition Method

Y-type zeolite membranes were synthesized by a two-step approach in which a particle seed layer was prepared by electrophoresis deposition(EPD) at first, followed by densification through secondary growth. The pre-seeding adopted the directing agent for Y-type zeolite synthesis serving as seeds. The effects of aging time of the directing agent, electrophoresis voltage and electrophoresis deposition time on seed layers quality as well as the quality of zeolite membranes were investigated. The results indicated that the zeolite seeds derived from the directing agent could be evenly deposited on substrate under certain EPD conditions. The XRD patterns of the seeded substrates after the secondary growth showed that the pure as-synthesized Y-type zeolite membranes had successfully grown on the substrates. The SEM images indicated that the substrate was covered by the highly intergrown zeolite crystals when the seeding solution employed the directing agent with an aging time of 2 days. The separation performance of zeolite membrane was evaluated using a CO_2/N2 mixture(with a mole ratio of 1:1) at different temperatures. Furthermore, the pervaporation measurements were carried out for the dehydration of isopropanol aqueous solutions with different mass fractions. The as-synthesized Y-type zeolite membranes exhibited a relatively high selectivity of water from isopropanol and sustainable permeation flux.

Fabrication of compact and stable perovskite films with optimized precursor composition in the fast-growing procedure

The fast-growing procedure （FGP） provides a simple, high-yield and lead （Pb）-release free method to prepare perovskite films. In the FGP, the ultra-dilute per- ovskite precursor solution is drop-cast onto a hot （-240℃） substrate where a perovskite film grows immediately ac- companied by the rapid evaporation of the host solvent. In this process, all the raw materials in the precursor solution are deposited into the final perovskite film. The potential pollution caused by Pb can be significantly reduced. Proper- ties of the FGP-processed perovskite films can be modulated by the precursor composition. While CH3NH3CI （MACI） affects the crystallization process and leads to full surface coverage, CH（NHz）2I （FAI） enhances the thermal stability of the film. Based on the optimized precursor composition of PbI2.（1-x）FAI.xMACI, x=0.75, FGP-processed planar het- erojunction perovskite solar cells exhibit power conversion efficiencies （PCEs） exceeding 15% with suppressed hysteresis and excellent reproducibility.

Synthesis and optical behaviors of 6-seleno-deoxyguanosine

We have developed a simple method to synthesize 6-seleno-2′-deoxyguanosine(SedG)by selectively replacing the 6-oxygen atom with selenium.This selenium-atom-specific modification(SAM)alters the optical properties of the naturally occurring2′-deoxyguanosine(dG).Unlike the native dG,the UVabsorption ofSedG is significantly influenced by the pH of the aqueous solution.Moreover,SedG is fluorescent at the physiological pH and exhibits pH-dependent fluorescence in aqueous solutions.Furthermore,SedG has noticeable fluorescence in non-aqueous solutions,indicating its sensitivity to environmental changes.This is the first time a fluorescent nucleoside by single-atom alteration has been observed.Fluorescent nucleosides modified by a single atom have great potential as molecular probes with minimal perturbations to investigate nucleoside interactions with proteins,such as membrane-transporter proteins.