聚D,L-乳酸的合成及表征

以D，L－乳酸为单体，辛酸亚锡为催化剂，乳酸先缩聚合解聚制备了D，L－丙交酯，并以丙交酯为单体开环本体聚合制备了聚乳酸。用IR、^1H－NMR对丙交酯及聚乳酸的结构加以证实；用TG、DSC测定了聚乳酸的热分解温度和玻璃化温度。测试结果表明，环状丙交酯在辛酸亚锡催化剂作用下发生了开环反应，所得聚合物的热分解温度为233．9℃，玻璃化温度为54．4℃。     

洗涤剂中微量总磷含量分析方法的研究

采用硝酸－高氯酸消解、氯化亚锡还原光度法检测液体洗涤剂中总磷含量，从而建立了液体洗液剂中微量总磷分析方法。此方法操作简单、准确、快速，方法最低检出限ＤＬ＝０．００６ｍｇ／Ｌ，加标回收率１０３％，精度〈５％。该方法既有学术价值又有实用价值。     

固体无机氯化物催化合成丁酸酯

通过对固体氯化物催化合成丁酸系列酯的研究， 证明该催化剂具有廉价易得， 反应时间短， 操作方便， 无三废污染等优点， 其最高酯化率和产品纯度均在９８ ％ 以上。     

A study of the tribological behaviour of an organotin compound

Oil‐soluble stannous oleate (SO) has been synthesised using oleic acid and SnO and its molecular structure confirmed. The tribological performances of SO and of complexes of SO with organosulphur or organophosphate compounds as lubricant additives in a VG26 white oil have been evaluated using a fourball friction and wear tester. The results show that SO exhibits good antiwear, load‐carrying, and friction‐reducing properties in the base stock, which are better than those of ZDDP. When 2.0% SO is added, the wear‐scar diameter reduced to 70% of that for the base stock alone, and the maximum non‐seizure load increased by 2.4 times. The friction coefficient was clearly reduced when SO was added. Synergistic effects were observed between SO and tricresol phosphate as regards the antiwear and load‐carrying properties, while a synergistic effect occurred only in terms of the antiwear properties for SO and a sulphurbased olefin. The elemental composition of the boundary lubricating film was examined by means of Auger electron spectroscopy (AES). The analytical results of AES indicate that the good performance of SO is attributable to the formation of a boundary lubricating film containing Sn on the rubbed surface.     

柠檬酸亚锡二钠的制备

以柠檬酸三钠、Sn Cl2、Na OH为原料合成了柠檬酸亚锡二钠,对反应条件进行了优选。得出下述最佳工艺条件:柠檬酸三钠对Sn Cl2过量2%,反应温度为80℃,反应终点p H值为6。沉淀经洗涤后为中间产物柠檬酸二亚锡,柠檬酸二亚锡与柠檬酸三钠以摩尔比为1∶1.2投料可制备柠檬酸亚锡二钠,产物亚锡含量29.5%以上。     

甲基磺酸盐镀锡稳定剂的研究

在含有Sn2+90 g/L,甲基磺酸120g/L、OP乳化剂10 mL/L、光亮剂12 mL/L的基础镀锡液中,通过加速氧化实验,确定了最佳稳定剂组成为:抗坏血酸2 g/,三氯化钛0.1 g/.结果表明,稳定剂与光亮剂具有协同作用,稳定剂使镀液的分散能力、光亮电流密度范围、锡析出过电位略有提高,电流效率提高1.14%以...     

环己酮缩1,2-丙二醇的绿色化工艺的研究

选用活性炭固载二氯化锡为催化剂，环己烷为带水剂，催化合成环己酮与1，2-丙二醇的缩酮，考察了各因素对缩合反应的影响。确定了最佳合成条件：催化剂用量1．50g，反应时间2．5h，酮醇摩尔比1：1．5，带水剂用量20mL。在此条件下，环己酮缩1，2-丙二醇的产率可达86．2％。催化剂可重复使用。     

A new route to synthesis silver nanoparticles on polyamide fabric using stannous chloride

Here, a one step in situ synthesis of silver nanoparticles on polyamide fabric was successfully performed using stannous chloride (SnCl₂) as a reducing and cetyltrimethylammonium bromide as a stabilizing agent. The treated fabrics were characterized with X-ray diffraction, field emission scanning electron microscope, and energy dispersion spectrum. The antibacterial activities of the fabrics against two diverse bacteria were examined and the fabrics color measured with reflectance spectrophotometer. The results revealed well loading and distribution of Ag NPs on the fabric surface with a crystal size of 16 nm with good antibacterial properties.     

PCL及PCL-PEG-PCL共聚物的合成与表征

以辛酸亚锡[Sn(Oct)2]作为引发剂,采用ε-己内酯(ε-CL)开环均聚合制备聚ε-己内酯(PCL),考察了n(ε-CL)/n[Sn(Oct)2]、反应温度和反应时间等因素对聚合产物特性黏数的影响。以Sn(Oct)2为催化剂,聚乙二醇(PEG)为引发剂,合成了不同相对分子质量的PCL-PEG-PCL三嵌段共聚物,研究了ε-CL均聚物及共聚物的结构、热性能和结晶形态。PCL最佳合成工艺为:n(ε-CL)/n[Sn(Oct)2]为400,温度130℃,反应时间4 h。随着PEG相对分子质量从2×103增加到8×103,三嵌段共聚物的熔融温度、熔融焓和结晶温度逐渐升高;结晶温度及PEG相对分子质量对PCL-PEG-PCL三嵌段共聚物球晶的形态和尺寸影响很大。     

新型羰基合成乙酸酐铑催化剂的制备及应用

制备了以氯化亚锡为配体的铑催化剂,评价了其在乙酸甲酯羰基合成乙酸酐中的性能。该催化剂既表现了良好的稳定性,又保持了较高的催化活性,乙酸酐时空收率为8.07 mol/(L.h),催化速率为每g铑生成乙酸酐809g/h。