聚(苯乙烯-环氧乙烷)嵌段大单体的合成、表征及其共聚合的研究

以异丙基苯钾(n-Cumyl potassium)作引发剂,α-甲基丙烯酰氯为终止剂,用阴离子聚合方法合成了一系列不同分子量、不同组成的新型聚(苯乙烯-环氧乙烷)(疏水-亲水型)嵌段大单体[Poly(St-b-Eo)-MA magromer]。用红外光谱及核磁共振进行了鉴定并测定了它的数均官能度(?)_n,对大单体与苯乙烯、甲基丙烯酸甲酯和甲基丙烯酸在不同条件下的共聚反应也进行了研究。发现反应条件对大单体和烯类单体的共聚速率均有很大影响。     

A－B型甲基丙烯酸酯嵌段共聚物的合成

Ａ－Ｂ型甲基丙烯酸酯嵌段共聚物的合成戴李宗，邹友思，刘秀彩，潘容华（化工系）基因转移聚合［‘ｊ（ＧＴＰ）作为一种极性单体的加聚方式，由于其许多的优点而受到日益广泛的重视．自该聚合方法发现以来的十余年时间内，人们已将注意力由对其机理等基础研究逐步转向新...     

Preparation and Characterization of Carbon Coated Silicon Nanoparticle as Anode Material for Li-ion Batteries

Silicon has been regarded as one of the most promising anode materials for Li-ion batteries. Its theoretical capacity （4 000 mAh/g） is much higher than that of the commercialized graphite （372 mAh/g）. However, the cycle performance of silicon is poor due to the severe volume expansion and shrinkage during Li^＋ insertion/extraction which results in pulverization of Si particles, eventually losing its Li^＋ storage ability. To solve this problem, nanosized Si particles were utilized and achieved a partial improvement by reducing the absolute volume change. Nevertheless, a new problem was encountered with nanosized material that small Si particles were aggregated to be larger one during Li^＋ insertion/extraction, and then pulverized again. In this work, we have succeeded to improve the cycle performance of nanosized Si particles by synthesis of carbon coated silicon nanopartiele.     

C6H5CH2C5H4NdCl2·3THF的合成及催化聚合活性研究

合成了苄基环戊二烯基二氯化钕配合物(C6H5CH2C5H4NdCl2·3THF).用元素分析、红外光谱分析对其结构进行了表征,该配合物与三乙基铝(AlEt3)组成的催化体系催化丁二烯聚合,单体转化率达85%.     

Study on Soap-free P（MMA-EA-AA/MAA） Latex Particles With Narrow Size Distribution

In the past decades, more and more studies have been focused on the synthesis of monodisperse particles with different diameter by special polymerization technique. In 1980＇ s, Ugelstad, et al invented two-step swelling method to prepare monodisperse microsphere with large size more than 1μm. In the following decade, Okubo and his coworkers synthesized monodisperse crosslinked polymer particles above 3μm using one-step dynamic swelling method. New method has been developed to produce particles more than 50 gm in diameter with a standard deviation of less than 2 % . Up to now, most of the monodisperse particles were usually prepared by polymerization of St in the presence of surfactants. In this presentation, sub-micro sized P （MMA-EA-AA/MAA） particles with narrow size distribution were prepared by seeded emulsion polymerization in the absence of any surfactant materials.     

四氢呋喃阳离子开环聚合的研究——聚合促进剂及水的影响

用三氟化硼引发四氢呋喃进行阳离子开环聚合,对环氟乙烷、环氧丙烷及环氧氯丙烷作聚合促进剂的引发效率进行了讨论.研究了水对BF_3-ECH引发四氮呋喃聚合的影响,通过改变加料方式,可使聚合反应得到很好控制以制备低分子量聚醚产物端羟基平均官能度为2且主要为伯羟基.     

聚对苯二甲酸乙二酯的酰氯法固态聚合

用酰氯-固态缩聚法合成了不含金属盐催化剂的聚对苯二甲酸乙二酯(PET),其中含有不同量的二甘醇链结构,含量从0～16mol%。本文还对聚合物的链结构、分子量分布和聚合动力学作了初步探讨。     

氯乙腈/氯化亚铜/2,2''''-联吡啶引发的苯乙烯原子转移自由基聚合

原子转移自由基聚合是一种新的活性自由基聚合方法。研究了氯乙腈／氯化亚铜／２，２＇－联吡啶引发的苯乙烯本体聚合反应，考察了单体转化率与相对分子质量之间的关系，并初步探讨了聚合反应动力学。     

己内酰胺与酰氯和酸酐反应的研究

己内酰胺在碱性介质中与酰氯反应,生成 N—酰基取代己内酰胺,后者也可以用相应的酸酐与己内酰胺在加热条件下制得。己内酰胺与等摩尔的邻苯二甲酰氯在碱性介质中的反应产物经水解后,和己内酰胺与等摩尔的邻苯二甲酸酐在加热条件下制得的产物不同。本文应用有机合成法并侧重用近代波谱解析阐明上述各步反应中的产物分子结构,澄清了文献中的分岐,合成了一些新化合物,提出上述有关反应的机理。     

PET/60PHB热致性液晶共聚酯的固相缩聚——影响表观反应速度的因素

本文将 PET/60PHB 热致性液晶共聚酯加热到玻璃化温度和熔融温度之间进行固相缩聚反应,研究了影响表观反应速度的主要因素——反应条件和预聚体的性质。在适当条件下固相缩聚反应,可将共聚酯的特性粘数[η]从0.690提高到1.083。