Synthesis and characterization of a new acrylic adhesive mixture for use in ocular strabismus surgery

A new series of acrylic adhesive mixtures was specifically designed for use in strabismus surgery, more precisely to join the rectus muscles to the sclera. These two-part adhesives consisted of a mixture of ethyl cyanoacrylate (CN) and ethyl carboxyacrylate (ECA). ECA acted as a plasticizer imparting flexibility to the CN, and also as a nonreactive diluent, serving to reduce the exotherm in the reaction between CN and eye tissues. In this article, the synthesis of the ethyl carboxyacrylate is described, and the properties of different ethyl cyanoacrylate + ethyl carboxyacrylate mixtures were studied. The curing reaction of the adhesive mixtures was monitored using Fourier transform infrared (FTIR) spectroscopy and scanning differential calorimetry (DSC). The rheological properties of the cured CN-ECA adhesive films were studied using plate-plate rheometer experiments. To quantify the adhesion, single lap-shear tests produced between a rubber and the adhesive mixtures were performed and, to evaluate the adhesion to eye tissues, tensile strength measurements of superior rectus muscle/adhesive mixture/sclera joints were carried out. The 70CN-30ECA (v/v) adhesive mixture provided the most adequate balance between adhesion and mechanical properties in the joining of the superior rectus muscle to the sclera. The glass transition temperature of the CN-ECA adhesive mixtures linearly decreased with increase in the ECA content, and a lower degree of conversion during polymerization was obtained by increasing the ECA content. As a consequence, the CN-ECA mixtures were less stiff than CN, giving better performance in the joining of the rectus muscles to the sclera. Finally, the adhesion of CN was sufficiently decreased in CN-ECA mixtures, and the locus of failure was directed to the adhesive film in the joint between the rectus muscles and the sclera.     

功能性单体对丙烯酸酯乳液胶粘剂性能的影响

以丙烯酸酯为主要原料合成了聚烯烃用乳液胶粘剂 ,考察了功能性单体包括丙烯酸和丙烯酸 - β -羟乙酯对丙烯酸酯乳液胶粘剂性能的影响     

增粘树脂对丙烯酸酯乳液胶粘剂性能的影响

针对聚烯烃复合薄膜用丙烯酸酯乳液胶粘剂 ,研究了增粘树脂的种类对剥离强度的影响 ,并从润湿的角度就松香对丙烯酸酯乳液体系增粘作用的机理进行了探讨。     

VAC/AA共聚乳液胶粘剂的合成与性能研究

本文介绍了醋酸乙烯酯—丙烯酸共聚乳液胶粘剂的合成与性能 ,研究了聚乙烯醇缩醛化和复合乳化剂体系对乳液稳定性和抗冻性的影响及引发剂用量和聚合保温时间与转化率的关系 ,同时还研究了丙烯酸含量对粘接强度的影响及 PH值与共聚乳液粘度的关系。结果表明 ,通过聚乙烯醇缩醛化和复合乳化剂体系 ,提高了乳液聚合稳定性和耐寒性 ;丙烯酸单体的引入 ,提高了乳胶的粘接强度 ,同时由于丙烯酸功能性基团的自增稠作用 ,可适当调节乳液的粘度以满足多方面要求     

含环戊二烯基的丙烯酸衍生物的合成和表征

以丙烯酸(AA)和环戊二烯(CPD)为起始原料,首先合成了丙烯酰氯(AC)和环戊二烯基乙醇(CPDE)两种中间体,通过酰氯与醇或活泼氢化合物之间典型的消除反应,合成了丙烯酸环戊二烯基乙酯(CEA)和环戊二烯—丙烯酸加合物(CPD—AA)。并对其结构进行了表征。     

胶粘剂国内外发展概况

本文综述了胶粘剂国内外发展概况,其中包括市场需要概况,主要工业化品种主要发展趋势和发展建议。涉及的胶粘剂类型有：三醛胶、水基胶、反应型胶、溶剂型胶、热熔胶和橡胶型胶等等。     

新型萘基环氧树脂的合成与表征

本研究以１－萘酚为原料,在催化剂的作用下合成了萘基环氧树脂（ＮＰＥＲ）,并对其特征性质进行了测试。采用红外光谱法和核磁共振氢谱法对ＮＰＥＲ的结构进行了剖析,推测出了ＮＰＥＲ的合成机理。     

多元共聚丙烯酸酯乳液胶粘剂在FPC工业中的应用与发展

本文简要介绍了柔性印刷电路(FPC)基材及其所用胶粘剂的种类和性能,对目前国外FPC工业中乳液型丙烯酸酯胶的应用和发展作了重点概括。 在FPC基材的生产中,乳液型内烯酸酯胶较其他类型的胶有优良电性能、物理性能和加工使用性能,因此被国外著名的生产厂家采用,由此生产的FPC基材已被广泛地应用于军工和一般电子设备中。因此这种胶也将是我国FPC基材工业要采用的主要胶种之一。     

浅析我国腈纶工业的现状及发展方向

简要介绍了我国腈纶工业的现状，并在此基础上，根据我国国情，对我国腈纶发展步伐和策略，提出了意见和建议。指出腈纶应扩大原料生产，加快设备的国产化。     

新型介孔分子筛的合成与性能表征

利用天然矿物钾长石作为硅铝源前驱体,采用一步晶化法合成出含有NaX型沸石基本结构单元的新型介孔分子筛。采用XRD,N2吸附-脱附曲线、红外光谱(FTIR)、固体核磁共振、SEM等测试方法表征了样品的结构特征和性能。研究表明：所合成的材料具有介孔分子筛的结构特征,孔壁含有NaX型沸石初级和二级结构单元(共享氧原子的[SiO4]和[AlO4]四面体及双六元环);样品的粒度为0．3～0．5μm;其比表面积为777m^2／g;平均孔径为3．2nm,孔壁厚度为1．7nm。固体核磁共振(^27Al MAS NMR)表明：样品经高温煅烧以后骨架中没有脱铝现象出现;TEM观察显示：样品从侧面看为较好的指纹状,正面则为典型的六方孔道排列,即孔口为六方形的蜂窝状结构。合成的样品具有更好的水热稳定性能。     

DEPOSITION AND RESTRUCTURING OF ADHESIVE PARTICLES IN UNIDIRECTIONAL FIELDS

The deposition of particles under the influence of gravity and adhesive interactions with the other deposited particles is examined using computer simulation. A parameter, s, that represents the probability of adhesion or sticking is used for studying the effects of variations in sticking on the resulting microstructure. A range of packing structures is generated between two limiting cases representing complete restructuring (s = 0) and no restructuring (s = 1). The bulk properties of the resulting structures, such as packing density, particle number density, and coordination number, are obtained. Structural correlations are examined through contact networks, radial and angular distribution functions, and diffraction patterns. The results show that local sticking rules have a significant influence on the long-range structure. Rhombic domains and significant long-range correlations are observed for the case of zero sticking probability. The range of correlations drops very sharply with increases in sticking probability, and large elongated voids, oriented in the direction of the external field, are formed with further increases in s. In the limit of perfect sticking, the deposit becomes columnar. The results have important implications to the structure of particle compacts and its influence on sintering of such compacts.     

EVIDENCE FROM INFRARED ELLIPSOMETRY FOR COVALENT BONDING AT A POLYMER/POLYMER INTERFACE WITH RELEVANCE TO "LOCK-UP" IN PRESSURE-SENSITIVE ADHESIVE LAMINATES

In a novel application, infrared spectroscopic ellipsometry is used to provide clear evidence for the formation of a covalent bond at a polymer/polymer interface. Specifically, there is evidence for the formation of a Si-O-C bond resulting from a reaction between the silyl (SiH) group of a poly(hydrogen methyl siloxane) crosslinker used in poly(dimethyl siloxane) and the carboxylic acid group of poly(acrylic acid). This covalent bond formation could explain the source of the "lock-up" that is sometimes found between acrylic pressure-sensitive adhesives and a silicone-coated release liner.     

天津市合成胶粘剂产业现状及发展建议

介绍了天津市胶粘剂工业现状 ,主要产品产业发展特点、优势以及今后发展建议     

A NEW HIGH TEMPERATURE AEROSOL DECOMPOSITION PROCESS FOR THE SYNTHESIS OF MIXED METAL OXIDES FOR CERAMICS AND CATALYSTS AND THEIR CHARACTERIZATION

A reactor system was developed which permitted the facile preparation of single and mixed metal oxides having high surface areas and unusual morphologies and physical properties. The synthetic technique produced compositions having a hollow sphere geometry, minimal pore structure, high purity, and low bulk density. Unusually high concentrations of solid solutions of modifying metal ions in host metal oxides were observed.     

DMFC用磺化聚酰亚胺质子交换膜的合成与性能

以一种磺化二胺单体2,2′-二磺酸基-4,4′-二苯醚二胺(S-ODA)与非磺化单体4,4′-二苯醚二胺(ODA),及二酐单体3,3′,4,4′-二苯甲酮四羧酸二酐(BTDA)为原料,采用高温一步法直接聚合,得到了一系列磺化聚酰亚胺(SPI)质子交换膜材料,并用红外光谱对聚合物进行了表征.通过改变聚合体系中磺化单体与非磺化单体的比例控制聚合物的磺化度,并研究了材料的组成对膜的电导率、吸水率等性能的影响。     

SYNTHESIS AND CHARACTERIZATION OF A WEAR-RESISTANT HYBRID POLYMER-CERAMIC COATING FOR DENTAL APPLICATIONS

A novel hybrid ceramic-polymer coating was developed to protect teeth enamel against both the acidic attack of the metabolic products of microbes and the stains produced by external agents. This material must also have a good abrasion resistance if it is to be used effectively as a dental coating. Accordingly, intensive abrasion experiments on teeth coated with this composite were performed, and the thickness reduction of the coating layer was determined by Raman spectroscopy; this revealed a high wear resistance of the composite developed, which is also biocompatible, inexpensive, easy to apply, highly transparent, and glossy; all important characteristics for dental applications.     

高固体分热固性丙烯酸树脂的合成及性能研究(Ⅱ)应用性能研究

采用基团贡献值法估算了丙烯酸聚合物和HDI缩二脲的三维溶解度参数,采用Fox方程和差热分析仪(DSC)估算和测定聚合物体系的玻璃化温度,结果表明,溶解度参数和玻璃化温度对高固体分热固性丙烯酸聚合物性能有重要的影响;采用傅立叶变换红外光谱(FTIR)、热重分析仪(TGA)、QUV加速老化试验仪等对丙烯酸聚合物及其涂膜的结构特点、热稳定性、耐老化性能等进行了研究。在此基础上,制得了性能优良的高固体分热固性丙烯酸聚氨酯涂料。     

医用多孔聚丙烯酰胺微球的制备与表征

以反相悬浮聚合法制备出适合医用的多孔载体材料——聚丙烯酰胺微球，经正交实验得到反应体系所需的最佳聚合条件。所得微球的检测结果表明，产物具有不同粒径和特定孔径的规则球形结构。     

马来酸乙二醇酯、丙烯酸共聚物合成与在水质稳定上的应用研究

合成了马来酸与乙二醇的酯化物。用该酯化物与丙烯酸二元共聚，及用该酯化物、丙烯酸、马来酸酐三元共聚，得到了两种共聚物。讨论了二元共聚物的特性粘数与单体用量的关系，并测定了二元共聚物及三元共聚物对Ｃａ２＋的螯合能力。