聚苯乙烯，聚甲基丙烯酸甲酯对聚氯乙烯／氯化聚乙烯共混体流变性的影响

PVC/CPE blend modified by rigid particles has good combined properties. In this paper, the effeCts of rigid particles (PMMA. PS. CaCO,) on the rheological behavior of PVC/ CPE systems were studied. The results showed that the apparent viscosity (aha) were decreased, extrusion surface smooth and Newtonian fluidity were slightly improved by filling a little amount of rigid ploymers (PS. PMMA) to PVC/CPE blends. The fluid activition energy (E,). Newtonian fluidity. extrusion surface smooth and ba of PVC/CPE blends were increased by filling CaCO₃ and die swelling ratio was decreased.The newtonian fluidity. En and ηa of PVC/CPE/CaCO₃ blends can be decreased by filling rigid polymers,and good extrusion surface smooth and low die swelling ratio unchanged.     

VOCl_3/Et_3Al_2Cl_3/CCl_4溶剂体系催化乙烯丙烯共聚

本文以VOCl_3/Et_3Al_2Cl_3为催化剂,在CCl_4溶剂中进行乙烯共聚反应。在聚合过程中,发生一异常的颜色突变现象。颜色突变后,体系催化聚合生成分子量很低的产物。从聚合物的结构表征及机理探讨表明:颜色突变后,体系产生了新的活性中心,催化机理发生了转变——由配位机理转变为阳离子机理。     

Studies on Artificial Imitation of Glutathione Peroxidase by Chemical Mutation

ＳｔｕｄｉｅｓｏｎＡｒｔｉｆｉｃｉａｌＩｍｉｔａｔｉｏｎｏｆＧｌｕｔａｔｈｉｏｎｅＰｅｒｏｘｉｄａｓｅｂｙＣｈｅｍｉｃａｌＭｕｔａｔｉｏｎＤＩＮＧＬａｎ；ＺＨＵＺｈｅｎ－ｑｉ；ＬＵＯＧｕｉ－ｍｉｎ；ＳＵＮＱｉ－ａｎ；ＹＡＮＧＴｏｎｇ－ｓｈｕａｎｄＳＨ...     

Chiral separation of triazole pesticide enantiomers by high performance liquid chromatography

Four triazole enantiomers of diclobutrazol (erythro form) (1), paclobutrazol (erythro form) (2), diniconazole (3) and uniconazole (4) have been separated by high performance liquid chro-matography (HPLC) on chiral stationary phase (CSP) OA-4700. Chromatographic data and a chiral recongnition model are presented for the separation of these pesticide enantiomers. The influence of column temperature and composition of mobile phase have been described.     

STUDY ON BIODEGRADABILITY OF POLY (3-HYDROXYBUTYRATE-co-3-HYDROXYVALERATE)/ORGANOPHILIC MONTMORILLONITE NANOCOMPOSITES

1. INTRODUCTION Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) has been recognized as apotential environment-friendly substitute for traditional plastics. The structure, mechanicalproperties and biodegradability of PHBV as biodegradable plastic have been reported by many groups [1-3]. However, PHBV presents some problems, such as high cost, slow crystallization rate, relatively difficult processing and high degree of crystallinity. Therefore, it is difficult to use PHBV widel…     

化合物库的组合技巧和组合合成

从化合物库的组合技巧和组合合成方法两个方面探讨了组合化学及其在药物开发中的应用。     

S-甘油醛缩丙酮的合成及其Wittig反应

以L-抗坏血酸为原料合成了S-甘油醛缩丙酮;研究了S-甘油醛缩丙酮的Wittig反应立体选择性.     

具有稳定可见光催化活性TiO2薄膜的常温制备

采用溶胶-凝胶法，通过钛酸丁酯水解制备了具有锐钛矿-金红石-板钛矿混晶晶粒的TiO₂溶胶。以四磺酸酞菁铜(CuTsPc)为敏化剂，经水浴加热后获得具有可见光响应活性的TiO₂溶胶。使用该溶胶浸渍-提拉涂膜，在室温下晾干即可得到酞菁敏化的TiO₂薄膜(CuTsPc-TiO₂)。对敏化溶胶的制备条件及薄膜的性能进行了考察，并探讨了CuTsPc的负载机理。结果表明:延长水浴时间或提高TiO₂溶胶中的CuTsPc浓度有利于增大薄膜中CuTsPc的负载量。随着薄膜中CuTsPc量的增加，薄膜的可见光催化活性增强，但CuTsPc负载过多又会导致薄膜光催化活性降低。CuTsPc通过静电作用在TiO₂胶粒表面发生吸附，从而实现在薄膜中均匀、牢固的负载，保证了CuTsPc-TiO₂薄膜在循环使用过程中的稳定性。     

钴(Ⅱ)与5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯络合物吸附波及其应用

钴 (Ⅱ )在NH3·H2O -NH2OH·HCl-5_(5_硝基_2_吡啶偶氮)_2,4_二氨基甲苯体系中有一灵敏的极谱波 ,其峰电位Vp 为 -1.20V(vsSCE) ,钴质量浓度在0.25～25μg/L范围内与峰电流Ip′有良好的线性关系 ,检出限为0.12μg/L;经多种电化学方法证明该波为络合物吸附波 ,其电极过程为不可逆过程 ,电子转移数为2 ,此外还试验了多种离子对峰电流Ip′的影响;所拟方法已用于维生素B12 和模拟样中痕量钴的测定     

脱羧氯雷他定的合成

脱羧氯雷他定 (ＤＣＬ)是一种有效的非镇定性抗组织胺 ,对过敏性鼻炎 ,糖尿病、咳嗽、普通感冒、流行性感冒、关节痛及其它不适症状都有很好的疗效[1～2 ] 。它克服了氯雷他定、酮康唑、红霉素、伊曲康唑等易引发黑色素瘤、纤维肉瘤、胃刺激、肥胖症、心律失调、传导紊乱等症状的缺点。且它的使用剂量只有氯雷他定的十分之一 ,有很好的市场前景和实际应用价值。ＭａｒｋＷ .Ｈｏｌｌａｄａｙｅｔａｌ[3] 在水溶液中由酸、碱催化得到了脱羧氯雷他定 ,但无具体操作和反应结果报道。Ａ .Ｋ .ＧｕｎｎａｒＡｂｅｒｇ[1] 直接用ＫＯＨ在绝对无水…