聚二甲基－二苯基硅氧烷二醇的制备

采用ＬｉＯＨ作催化剂，ＤＭＦ为促进剂，利用八甲基环四硅氧烷（Ｄ４）、八苯基环四硅氧烷（Ｐ４）为单体，制备聚二甲基－二苯基硅氧烷二醇．在一定条件下，其分子量可由加水或ＬｉＯＨ的量控制．未反应的Ｐ４可由石油醚－甲醇处理除去．     

三甲基硅基烯醇醚的合成

本文研究了酮类化合物与原位产生的三甲基碘硅烷反应,制取了1-三甲硅氧基环己烯,2-三甲硅氧基丙烯和α-三甲硅氧基苯乙烯。此法原料易得,反应条件温和,反应时间短,产品纯度和收率高。     

一种聚氯乙烯钙电极的研制

一、前言 1967年Ross首先以二癸基磷酸钙溶于苯基膦酸二辛酯的溶液为液体离子交换剂,制成液态膜钙电极。1970年Moody等人用与上面相同的离子交换剂制成P.V.C(聚氯乙烯)膜钙电极。其电阻为25MΩ,响应时间为6秒。72年他们对这种电极又进行了深入的研究,电极的性能有所改进。但响应时间却增长至三分钟。我们找到了另外一种国产溶剂——甲基膦酸二(1—甲)庚脂,用自己合成的二癸基磷酸钙为电活性物质,试制成一种P.V.C钙电极,其电阻约为0.02MΩ,响应时间为二秒。     

关于假不对称碳原子

大学有机化学立体化学部分,多数教材未讨论“假不对称碳原子”。在教学中,同学们常提出一些涉及“假不对称碳原子”概念的问题。为此,本文就此问题做一些比较详细的讨论。现在以2,3,4-三羟基戊二酸为例,讨论几个在教学中常遇到的问题。一、光学异构体的数目 2,3,4-三羟基戊二酸的构造式为:     

二氧化硅改性片状铁粒子的微波吸收性能

The preparation and microwave-absorbing behavior of micrometric silica-modified platelet iron particles (SMPLIP) were investigated. Through precipitation， hydrothermal reaction， silica-modification and reduction with hydrogen， micrometric porous SMPLIP were yielded. The permittivity values of SMPLIP had been significantly decreased due to the presence of silica. Measurements and calculations showed that a 1.93mm thick sample containing SMPLIP as much as 60% by weight was capable of absorbing X band(8.2～12.4GHz) microwaves with reflection loss being greater than -10dB within the frequency range of 8.2～11.36GHz， while the maximum re-flection loss was -14.8dB at 9.4GHz. The results had also shown that it was practicable to prepare thin， light-weight microwave absorbent with SMPLIP.     

替代M-型钡铁氧体纳米粒子的微波吸收性能

The microwave-absorbing behavior of substituted M-type barium ferrite nano-particles was investigated. The nano-particles were synthesized with coprecipitation-melted salt method. For the purpose of comparison, corre-sponding micro-particles were also prepared through direct coprecipitation and sintering. XRD and TEM of the nano-particles showed that the ferrite was hexagonal in structure and widely distributed in size with particle size being less than 100nm, the complex permittivity and permeability of a 1.50mm thick specimen and a 1.40mm thick specimen containing 60% by weight of substituted M-type barium ferrite nano-particles and micro-particles were measured respectively in X band (8.2～12.4GHz) range, from which the reflection loss (R.L.) of microwaves was calculated and two comparative absorption curves were given. The results showed that the synthetic nano-particles could well absorb microwaves in X band. The absorption was larger than 10dB in the range of 9.2～12.4GHz while the maximum absorption was 38.6dB at 10.6GHz.     

利用三甲硅基烯醇醚制备α-溴代醛酮

利用三甲硅基烯醇醚,在不同溶剂中制备了4种a-溴代醛酮,其产率在80%～95%之间.     

α,β—二甲基脱水丙酮联苯酰的合成

用两种改进的方法，由联苯甲酰与３－戊酮反应制得α、β－二甲基脱水丙酮联苯酰（１），其结构由熔点、ＩＲ、ＨＮＭＲ确定，从ＨＮＭＲ谱推测：用乙醇作溶剂，加入ＫＯＨ、联苯甲酰及３－戊酮，于室温搅拌３ｈ后放置３天，所得ＩＡ为两对对映体；用苯作溶剂，加入适量聚乙二醇４００（ＰＥＧ４００），其它反应物同方法１，加热回流３ｈ，所得产物ＩＡ仅为一对对映体，改进的方法都缩短短了反应时间，上述两种方法得到的产物，经脱     

含油层早期产能预测方法

油藏勘探阶段 ,利用录井地化热解资料可以准确地求取原油粘度和含油饱和度。在此基础上 ,建立储层油相渗透率与含油饱和度关系模型 ,避免了在资料较少情况下求取油相渗透率的不确定性。根据流体渗流理论 ,利用原油产能指示参数预测模型可以对产层进行原油产能预测。对胜利油田不同层位、不同流体性质、不同含油性等储层的 33口井 42层产能预测结果与试油结果进行了对比。结果表明 ,利用该方法能进行早期产能预测 ,并且能够达到较高的预测精度。     

聚二甲基—二苯基硅氧烷与聚二甲基—甲基乙烯基硅氧烷？…

采用氢氧化锂作引发剂，Ｎ，Ｎ－二甲基甲酰胺作促进剂，八甲基环四硅氧烷，八苯基环四硅氧烷及四甲基－四乙烯基环四硅氧烷作单体，合成了聚二甲基－二苯基硅氧烷与聚二甲基－甲基乙烯基硅氧烷形成的ＡＢ嵌段共聚物，研究了氢氧化锂的用量及反应时间对反应的影响，并且用＾１ＨＮＭＲ，ＩＲ，ＵＶ谱及特性粘数对嵌段聚合物进行了表征。