膨润土的巯基功能化研究

采用γ-巯丙基三甲氧基硅烷与表面硅羟基的反应,对膨润土进行了巯基功能化.并对其进行了表征,XRD、TG、FT-IR和SEM的测定结果均表明,膨润土表面成功地接枝上了巯丙基.     

一种AFM观察聚合物单分子的新方法

采用带有双键的γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(硅烷偶联剂KH-570)对云母表面进行改性,使之参与丙烯酰胺的聚合,将伸展的聚丙烯酰胺(PAM)单分子固定在云母表面后,进行了用原子力显微镜观察PAM单分子的实验,为原子力显微镜观察聚合物单分子提供了一种新的方法.     

巯基改性的硅藻土性能研究

采用γ-巯丙基三甲氧基硅烷与表面硅羟基的反应,对硅藻土进行了巯基改性,并对其进行了表征.XRD、TG和SEM的测定结果均表明,硅藻土表面成功地接枝上了巯丙基.重金属吸附实验表明,巯基改性后硅藻土的吸附性能有所提高.     

聚γ-(β-甲硒基)丙基硅氧烷钯(Ⅱ)配合物的合成及其催化酰胺化性能

γ -氯丙基三乙氧基硅烷依次进行气相法二氧化硅固载化 ,甲基硒钠硒化 ,再与氯化钯反应 ,合成聚γ - (β -甲硒基 )丙基硅氧烷钯 (Ⅱ )配合物 ,研究其催化物芳基卤化物的酰胺化性能 .     

γ-氯丙基三氯硅烷的合成

用三氯氢硅、氯丙烯为原料，在新型的铂化物催化下，采用新工艺合成的γ-氯丙基三氯硅烷，收率达86％；它是合成多种硅烷偶联剂的重要原料。     

甲基-γ-氨丙基聚硅氧烷的合成及其与甲苯二异氰酸酯交联后的氧氮透气性

由甲基硅单体与γ-氨丙基硅单体共水解缩合得到侧链含γ-氨丙基的聚硅氧烷。通过两种有机硅单体的竞聚率测定,认为以环体形式的硅单体可以聚合得到氨丙基分布较为均匀的聚合物。经甲苯二异氰酸酯交联后的硅橡胶显示出较高的氧氮透气选择比,有利于从空气中富集氧。     

3,7-二甲基-2-十三碳醇乙酸酯的合成——松叶蜂Diprion pini性信息素活性组分

对松叶蜂 diprion pini性信息素活性组分 3,7-二甲基 -2 -十三碳醇乙酸酯的全合成进行了研究 .以丙二酸二乙酯和 2 ,3-环氧丁烷为原料 ,分别合成了两个重要结构单元—— 2 -甲基 -1-辛烷基锂和 3,4-二甲基 -γ-丁内酯 .2 -甲基 -1-辛烷基锂与 3,4-二甲基 -γ-丁内酯反应 ,得到的酮醇再经黄鸣龙还原 ,得到 3,7-二甲基 -2 -十三碳醇 ,经酯化 ,得到 3,7-二甲基 -2 -十三碳醇乙酸酯     

聚丙烯中三种外给电子体的合成

国内外为了生产结晶度更高的聚丙烯,大家都在研究合成使用效果更好的外给电子体.试验制备合成了异丁基环己基二甲氧基硅烷,正丙基三甲氧基硅烷和正丙基三乙氧基硅烷三种外给电子体,通过测定最佳反应时间,最适宜的反应温度和最佳的pH值,来测定合成产率最高的三种外给电子体的最优试验条件.     

天冬酰胺键合硅胶的制备与表征

采用固液相表面化学反应法,以胺丙基硅胶为基质,通过丁二酸酐将胺丙基转化为羧基,以1-乙基-（3-二甲基氨基丙基）碳二亚胺盐酸盐（EDC）和N-羟基琥珀酰亚胺（NHS）为羧基活化剂,制备了天冬酰胺键合硅胶。利用元素分析、X射线光电子能谱分析和紫外吸收光谱分析对键合硅胶表面功能团进行表征,结果表明天冬酰胺成功键合到硅胶表面,键合量为0.6mg/g。     

水辅助制备稳定的CsPbBr3@SiO2纳米粒子

针对CsPbBr3钙钛矿量子点存在稳定性差、易被极性溶剂破坏、易发生离子交换等问题,利用含有多支链的有机硅配体γ-巯丙基三乙氧基硅烷和3-氨丙基三乙氧基硅烷,通过配体辅助再沉淀法制备出CsPbBr3@SiO2纳米粒子。研究发现,在制备过程中加入微量的水可以有效地促进有机硅水解缩合,从而诱导CsPbBr3@SiO2纳米粒子的形成。制备得到的纳米粒子直径约为200 nm,光致发光峰(PL)位于508 nm处,在乙醇中存放7 d荧光强度未减弱,在四丁基碘化铵/二氯甲烷中存放6 h未发生离子交换,说明制备得到的纳米粒子具有较好的稳定性。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.