聚乳酸-聚氨酯微球的合成及其形态的研究

以低相对分子质量生物可降解D，L-聚乳酸(D，L-PLA)二醇和六亚甲基二异氰酸酯(HDI)为原料、1，4-丁二醇(BD)为扩链剂及聚乙烯基吡咯烷酮(PVP)为悬浮剂，通过悬浮聚合法初步合成了一种新型聚氨酯微球(PUMS)。用扫描电子显微镜(SEM)考察了BD的含量对微球表面形态的影响，通过激光粒度分析仪讨论了搅拌速率和PVP浓度对微球粒径及其分布的影响，用傅立叶变换红外光谱(FTIR)粒度分析仪对微球的化学结构进行了表征。结果表明，合成的微球的平均粒径随搅拌速率和PVP浓度的增加而减少，粒径分布变宽；当搅拌速率为400r／min，PVP质量分数为1．5％时。微球的平均粒径约47μm，粒径分布最窄。约在10～90μm；微球表面有孔，但随着BD含量的增加，微球表面变得相对粗糙，孔数减少，孔径减小，直至孔消失。     

反应精馏过程模拟研究进展

对均相反应精馏和非均相催化精馏过程的各种模拟计算方法进行了评述，分析了各种算法的优缺点和适用范围，指明了目前研究中存在的不足和今后的发展方向。     

粒子弥散强化氮化硅基陶瓷

运用晶界工程理论，选择能形成高耐炎度晶界相的Ｙ２Ｏ３和Ｌａ２Ｏ３双稀土氧化物为Ｓｉ３Ｎ４陶瓷烧结助剂，材料具有优异的高温强度。第二相碳化硅粒子的引入有效地改善了氮化陶瓷的显微结构和力学性能。以无压烧结工艺制备的高性能α／β－Ｓｉａｌｏｎ复相陶瘊等在实际应用中获得良好效果。     

流化床技术在提高尿素产品质量中的应用

应用尿素流化床装置有效解决了因造粒塔能力不足而造成的成品尿素温度偏高、粉尘含量较高、平均粒径偏小、存放易结块等问题，并且具有良好的经济效益。     

Mn2+、Nb5+共掺BaTiO3陶瓷的制备及压电性能的研究

本文采用改进的固相反应法,制备了施主杂质Nb5 和受主杂质Mn2 共掺的BaTiO3陶瓷。按不同Nb5 、Mn2 的掺杂量,分别在1180℃、1210℃、1250℃、1280℃温度下煅烧。实验结果表明:当烧结温度为1250℃、掺杂量为0.05mol%时,制得的试样性能较好。     

疏水性蛋白荧光探针Bis-ANS的合成

疏水蛋白荧光探针8,8’-二苯胺基-5,5’-二磺酸联萘(bis-ANS)是研究蛋白质结构及观察其行为的重要工具。以8-苯胺基-1-萘磺酸铵(ANS)为原料:氧化偶联合成了bis-ANS,通过摸索寻找到一种优良的分离方法,并研究了溶剂、温度对收率的影响,目标产物结构经过核磁共振(1H NMR)1、3CNMR和质谱(MS)确证。     

Syntheses and biological activities of polymers containing methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid or 5‐fluorouracil

A series of novel copolymers, poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthalic acid) [poly(MTCA‐co‐ETAc)], poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐hydrogenethyl‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthalate) [poly(MTCA‐co‐HEET)], and poly(methacryloyl‐2‐oxy‐1,2,3‐propanetricarboxylic acid‐co‐α‐ethoxy‐exo‐3,6‐epoxy‐1,2,3,6‐tetrahydrophthaloyl‐5‐fluorouracil) [poly(MTCA‐co‐EETFU)], were prepared from corresponding monomers by photopolymerizations at 25°C for 48 h. The polymers were identified by FTIR, ¹H‐NMR, and ¹³C‐NMR spectroscopies. The number‐average molecular weights of the fractionated polymers determined by GPC were in the range from 9400 to 14,900 and polydispersity indices were 1.2–1.4. The in vitro IC₅₀ values of polymers against mouse mammary carcinoma (FM3A), mouse leukemia (P388), and human histiocytic lymphoma (U937) as cancer cell lines and mouse liver cells (AC2F) as a normal cell line were much higher compared to that of 5‐fluorouracil (5‐FU). The in vivo antitumor activities of monomers and polymers against mice bearing sarcoma 180 tumor cell line were better than those of 5‐FU. The inhibition of DNA replication and antiangiogenesis activities of MTCA and copolymers were better compared to those of 5‐FU. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 57–64, 2004     

Emission inventory of VOCs from mobile sources in a metropolitan region

Based on methodologies developed by US EPA, European EMEP/CORINAIR, and Australian NPI, and the former emission inventory in Korea, two methods were applied to 151 villages in northeastern Seoul, Korea to estimate emission of VOCs from line and area vehicle sources depending on vehicle types with different fuel types. A discharge coefficient method for the line source on the Eastern main road was calculated by multiplying the emission amounts per unit of mileage, and a fuel exhaust coefficient method for the area vehicle sources on other roads was determined as multiplying the emission rates by the actual consumption of excess fuel. Results indicated the methods could be adequate for estimating the amounts of mobile emissions when limited information on mobile emission is available. The methods can be used to develop the emission model for all VOCs emission sources (point and non-point sources), which provides input data of atmospheric models.     

多功能污水处理剂的合成和应用

以含1～4个羟基的有机醇、环氧氯丙烷和有机胺为原材料，在催化剂作用下聚合而成的聚醚型有机胺盐（KL-1），具有浮选净化、杀菌、脱色、缓蚀的功能，通过室内和现场试验表明，KL-1不仅有良好的污油、固体悬浮物去除效果，而且有较好的杀菌和缓蚀性能，是一种具有广泛应用前景和良好经济效益的多功能污水处理剂.     

神木煤的主要性质对其水煤浆特性的影响

研究我国大型优质神木煤田12个煤样的主要性质,对其水煤浆特性的影响。实验表明,煤中水分和含氧官能团是主要因素,水分中以最高内在水分与水煤浆浓度呈线性相关,提出以最高内在水分作为评价指标。并研究了煤浆的改性方法,一是加热方法使水分和官能团脱除,煤表面亲水性降低,使煤浆浓度大幅度提高,二是除去煤中可溶无机离子,可使煤浆粘度降低,并添加某些电解质有可能提高稳定性。