环氧基封端聚二甲基硅氧烷的特性粘数与摩尔质量的关系

采用端基分析法测定了环氧基封端聚二甲基硅氧烷的数均摩尔质量（Ｍｎ），研究了其特性粘数（η）与Ｍｎ之间的关系。     

干法腈纶聚合物性能指标相互关系的研究

基于聚合反应条件,利用端基分析,建立了干法腈纶聚合物的游离酸（ＦＡ）、端基滴定度（ＥＧＴ）、相对分子质量（Ｍｎ）等主要性能指标的定量关系式。依据其关系式,分析了不同化工原料对聚合物分子链上的硫的贡献,确定了生产中稳定控制硫的重点。     

甲酰基甲酸缩氨基硫脲和1,10—菲罗啉的过渡金属配合物的合成,表征 …

合成了组成了为ＭＬＢ．ｎＨ２Ｏ（Ｍ＝Ｍｎ（Ⅱ）,Ｃｕ（Ⅱ）,Ｚｎ（Ⅱ）和Ｃｄ（Ⅱ）,ｎ＝１,Ｍ＝Ｎｉ（Ⅱ）,ｎ＝２,Ｌ＝甲酰基甲酸缩氨基硫脲：Ｂ＝１,１０－菲罗啉）的５种三元配合物,测定了其元素组成,摩尔电导率和磁化率;用电子光谱和红外光谱表示表征,提出了它们的结构,研究了配体甲酰基甲酸缩氨基酸脲及其配合物的杀菌活性。     

甲酰基甲酸缩氨基硫脲和1,10-菲啰啉的过渡金属配合物的合成、表征及杀菌活性

合成了组成为ＭＬＢ·ｎＨ２Ｏ［Ｍ＝Ｍｎ（Ⅱ）、Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）和Ｃｄ（Ⅱ）,ｎ＝１;Ｍ＝Ｎｉ（Ⅱ）,ｎ＝２;Ｌ＝甲酰基甲酸缩氨基硫脲;Ｂ＝１,１０－菲啉］的５种三元配合物。测定了其元素组成、摩尔电导率和磁化率;用电子光谱和红外光谱进行表征,提出了它们的结构。研究了配体甲酰基甲酸缩氨基硫脲及其配合物的杀菌活性。     

聚酯生产中羧端基的生成与控制

结合生产实际．总结以ＤＭＴ和ＥＧ为原料，以Ｍｎ（Ａｃ）２－Ｓｂ２Ｏ３－Ｈ３ＰＯ３为催化稳定剂体系．在酯交换法连续缩聚生产过程中．羧端基的生成。探讨了生产负荷、缩聚釜液位、反应温度、催化剂体系和用量，搅拌速度等因素．对ＰＥＴ最终产品中羧端基的影响和控制方法。     

含端基氯低聚物引发剂的合成及其引发苯乙烯聚合的研究

通过对４种端羟基低聚物进行氯乙酰化反应,制备了一系列含端基氯的低聚物,然后以这些含端基氯的低聚物为大分子引发剂,在ＣｕＣｌ／ｂｐｙ存在下引发苯乙烯的ＡＴＲＰ反应,得到ＡＢＡ嵌段共聚物。用＾１Ｈ－ＮＭＲ分析证明了聚合物的嵌段结构,以ＳＥＣ测定了聚合物的相对分子质量及其分布,发现嵌段聚合物的相对分子质量和单体转化率成正比,并和相对分子质量的理论值Ｍ↑－ｎ,ｔｈ＝（Δ［Ｍ］／［ｏｌｉｇｏｍｅｒ－Ｃｌ］）     

由聚二甲基硅氧烷制备六甲基二硅氧烷

由聚二甲基硅氧烷制备六甲基二硅氧烷（Ｍｅ３Ｓｉ）２Ｏ可通过ＭｅＭｇＸ（Ｘ＝Ｃｌ，Ｂｒ，Ｉ）与Ｍｅ３ＳｉＯ（ＳｉＯＭｅ２）ｎＳｉＭｅ３（Ｉ；ｎ＝５０～１０００）反应，再经水解而制得。例，将Ｉ（ｎ＝９０）的二丁基醚溶液，用＞３０ｍｉｎ的时间逐滴加入到Ｍｅ...     

吡咯烷基二硫代甲酸钠与Mn（Ⅱ）的螯合反应的研究

研究了吡咯烷基二硫代甲酸钠ＮａＬ与Ｍｎ（Ⅱ）的螯合反应。求得其产物组成为Ｍｎ（ＯＨ）Ｌ２。此产物初呈淡黄色，烘干后转为棕色。据此推定分别为高自旋型和低自旋型螯合物。     

烯丙基硅(氧)烷铂配合物硅氢加成催化剂的研究

通式为（ＣＨ２ ＣＨＣＨ２） ｎＳｉＲ（４－ ｎ） （ ｎ ＝ ２ ,３ ,４ ;Ｒ＝ Ｍｅ ,Ｐｈ） 的烯丙基硅烷以及１ ,３ 二烯丙基 四甲基二硅氧烷（ＤＡＴＭ） 经由Ｇｒｉｇｎａｒｄ 反应制备,它们再与氯铂酸反应制备出相应的标题配合物,这种配合物可用做硅氢加成催化剂。研究发现在氯丙烯与硅氯仿的加成反应中,ＴＡＳ（ ｎ ＝ ４） 、ＤＭＤＡ（ｎ ＝ ２ ,Ｒ＝ Ｍｅ） 、ＭＴＡ（ ｎ ＝ ３ ,Ｒ＝ Ｍｅ） 和ＤＡＴＭ 的铂配合物的活性都比氯铂酸大。同时还讨论了几种铂配合物催化剂对含氢硅油与乙烯基硅橡胶的加成反应活性,发现不同催化剂的活性各不相同。     

双组份缩合型室温硫化硅橡胶制备技术的讨论

以疏水处理气相ＳＯ２填充补强Ｍｎ＝４０００～４５０００范围内的羟基封端聚二甲基硅氧烷制备双组份室温硫化硅橡胶（ＲＩＶ－２）与混用高低分子量生胶或接枝硅橡胶做基胶相比，前者可以适度交联形成强韧的弹性体。     

Preparation and characterization of siliconized epoxy/bismaleimide (N,N′‐bismaleimido‐4,4′‐diphenyl methane) intercrosslinked matrices for engineering applications

Novel hybrid intercrosslinked networks of hydroxyl‐terminated polydimethylsiloxane‐modified epoxy and bismaleimide matrix systems have been developed. Epoxy systems modified with 5, 10, and 15 wt % of hydroxyl‐terminated polydimethylsiloxane (HTPDMS) were developed by using epoxy resin and hydroxyl‐terminated polydimethylsiloxane with γ‐aminopropyltriethoxysilane (γ‐APS) as compatibilizer and dibutyltindilaurate as catalyst. The reaction between hydroxyl‐terminated polydimethylsiloxane and epoxy resin was confirmed by IR spectral studies. The siliconized epoxy systems were further modified with 5, 10, and 15 wt % of bismaleimide (BMI). The matrices, in the form of castings, were characterized for their mechanical properties. Differential scanning calorimetry and thermogravimetric analysis of the matrix samples were also performed to determine the glass‐transition temperature and thermal‐degradation temperature of the systems. Data obtained from mechanical studies and thermal characterization indicate that the introduction of siloxane into epoxy improves the toughness and thermal stability of epoxy resin with reduction in strength and modulus values. Similarly the incorporation of bismaleimde into epoxy resin improved both tensile strength and thermal behavior of epoxy resin. However, the introduction of siloxane and bismaleimide into epoxy enhances both the mechanical and thermal properties according to their percentage content. Among the siliconized epoxy/bismaleimide intercrosslinked matrices, the epoxy matrix having 5% siloxane and 15% bismaleimide exhibited better mechanical and thermal properties than did matrices having other combinations. The resulting siliconized (5%) epoxy bismaleimide (15%) matrix can be used in the place of unmodified epoxy for the fabrication of aerospace and engineering composite components for better performance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 38–46, 2001     

Morphology and properties of polydimethylsiloxane-modified epoxy resin

The morphology and fracture toughness of epoxy resins modified with amino-terminated polydimethylsiloxane (ATPDMS), differing in their molecular weight, and the degree of the preliminary reaction in the melt state were investigated. Tetramethyl biphenol diglycidyl ether (TMBPDGE) was used as the base epoxy resin. The degree of preliminary reaction between epoxy and polysiloxane increased with the decrease of the molecular weight of polysiloxane in the melt state. When the low molecular weight polysiloxane (AT900) was mixed with high molecular weight polysiloxane in the preliminary reaction, the low molecular weight polysiloxane enhanced the compatibility between the epoxy resin and the high molecular weight polysiloxane and produced smaller size and narrow distribution of polysiloxane particles. The small and highly concentrated polysiloxane particles, as determined by scanning electron microscopy improved the fracture toughness of the epoxy resin. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 941–955, 1997     

聚硅氧烷型增容剂改性环氧体系的研究

本文用环氧树脂、瑞羟基聚二甲基硅氧烷等为原料,合成了增容剂,其可使聚二甲基硅氧烷有效地分散在环氧体系中而使环氧增韧。通过红外光谱测定、扫描电子显微镜观察,热失重分析及其他力学性能测试,对该体系的增容和增韧效果进行了研究。     

Ⅰ型水性环氧树脂涂料的研制

采用低分子量液体环氧树脂与非离子表面活性剂（BMJ）反应合成BMJ－环氧加成物,将表面活性链段引入到环氧树脂分子链中,然后经封端和成盐得到Ⅰ型水性环氧固化剂,研究了影响Ⅰ型水性环氧固化剂及其所配乳液涂料性能的因素,并对乳液的稳定性和固化速度,漆膜硬度等性能进行了评价。     

Synthesis and Characterization of Polysiloxane Grafted Polyamide‐Amine Surfactants

Dendritic‐linear surfactants 1G PAMAM–Si and 2G PAMAM–Si were prepared by grafting the single epoxy terminated polydimethylsiloxane (SEPDMS) onto the 1G and 2G dendritic polyamide‐amine (PAMAM), respectively. SEPDMS was synthesized by hydrogen‐terminated polydimethylsiloxane and allyl glycidyl ether in chloroplatinic acid. The optimum grafting conditions were obtained by single‐factor experiments when the mole ratio of SEPDMS and PAMAM was 0.95:1, the reaction temperature was 60 °C, the reaction time was 5 h and the solvent percentage was 60%. The molecular structure of PAMAM–Si was characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, gel permeation chromatograph and potentiometric acid‐base titration. Furthermore, the stability, surface activity and emulsifying ability of the prepared surfactants were studied. The results showed that PAMAM–Si has high stability against dilution, acids, alkalies and salts. PAMAM–Si surfactants can significantly reduce the surface tension of water. And 2G PAMAM–Si is superior to 1G PAMAM–Si at the ability of emulsifying oil.     

Morphology and thermomechanical properties of epoxy thermosets modified with polysulfone‐block‐polydimethylsiloxane multiblock copolymer

Polysulfone‐block‐polydimethylsiloxane (PSF‐b‐PDMS) multiblock copolymer was synthesized via the Mannich polycondensation between phenolic hydroxyl‐terminated polysulfone and aminopropyl‐terminated polydimethylsiloxane in the presence of formaldehyde. The multiblock copolymer was characterized by means of nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC) and used as a modifier to improve the thermomechanical properties of epoxy thermosets. Transmission electron microscopy (TEM) showed that the epoxy thermosets containing PSF‐b‐PDMS multiblock copolymer possesses the microphase‐separated morphological structures. Depending on the content of the PSF‐b‐PDMS multiblock copolymer, the spherical particles with the size of 50–200 nm in diameter were dispersed into the continuous epoxy matrices. The measurement of static contact angles showed that with the inclusion of PSF‐b‐PDMS multiblock copolymer, the epoxy thermosets displayed the improved surface hydrophobicity. It is noted that the epoxy resin was significantly toughened in terms of the measurement of critical stress field intensity factor (K_1C). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Development and characterization of phosphorus-containing siliconized epoxy resin coatings

The objective of the present work is the development and characterization of siliconized epoxy-phosphorus based bismaleimide coating systems using diglycidylether terminated poly (dimethylsiloxane) (DGTPDMS) and phosphorus-containing bismaleimide (PBMI) as chemical modifiers for epoxy resin. Phosphorus-containing diamine (DOPO-NH₂) was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 4,4′-diaminobenzophenone (DABP), which was utilized in the preparation of phosphorus-containing bismaleimide (PBMI) with maleic anhydride. Siliconized epoxy prepolymer was prepared using epoxy resin and functionally terminated polydimethylsiloxane. The purity and structural conformation of these materials were ascertained from FTIR and NMR spectral studies. The prepared siliconized epoxy prepolymer was blended with varying percentages of PBMI using diaminodiphenylsulfone (DDS) and diaminodiphenylmethane (DDM) as curing agents. The siliconized epoxy and bismaleimide modified epoxy and siliconized epoxy coating materials were characterized by dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), heat distortion temperature (HDT) and Limiting oxygen index (LOI).     

Crosslinking of polydimethylsiloxane diol blended with poly(dimethylsiloxane-b-styrene-b-dimethylsiloxane)

A variety of blends of poly(dimethylsiloxane-b-styrene-b-dimethylsiloxane) copolymers with hydroxyl terminated polydimethylsiloxane (molecular weight, 29 600 gmol^?1) were prepared. Crosslinking of blends was accomplished at room temperature by reacting hydroxyl chain ends with a tetrafunctional orthosilicate using dibutyltin dilaurate as a catalyst. The crosslink density was evaluated by toluene swelling. Catalyst concentration influences the crosslink density as observed from the amount of extractables in toluene. The tensile strength of crosslinked polydimethylsiloxane was found to increase by blending with block polymers or with silica fillers. Structural uniformity of fractured surfaces of rubbers was also studied by scanning electron microscopy.     

端异氰酸酯聚醚的合成及对环氧树脂的改性作用

合成端异氰酸酯聚醚 (ITPE) ,使其在不同条件下与环氧树脂 (ER)进行反应 ,得到分子链中含氨基甲酸酯和口恶唑烷酮结构的环氧树脂预反应物 ,考察了聚醚种类、相对分子质量和用量及固化条件对改性环氧胶胶接件拉伸剪切强度和浇铸件断裂韧性的影响 ,并以扫描电镜观察断面形貌     

Synthesis and characterization of a novel POSS/PS composite via ATRP of branched functionalized POSS

A new process to prepare L-lactic acid based polymer with high molecular-weight was established. In this process, the carboxyl terminated poly (L-lactic acid) (PLLA) prepolymer was first synthesized via polycondensation of L-lactic acid and a little adipic acid, and then the molecular weight of PLLA was increased by a chain-extending reaction using bisphenol-A epoxy resin as a chain extender. In situ FTIR was used to characterize the activity of reaction between epoxy groups at the end of bisphenol-A epoxy resin and carboxyl groups at the end of PLLA prepolymer, and the results showed that the reaction was of high activity. The weight-average molecular weight of prepared L-lactic acid based copolymer (PLLA-co-BisA ER) was up to 210,000 at an optimum synthetic condition. The thermal property and crystallization behavior of prepared copolymer were also studied.