聚硅氧烷改性环氧树脂的研究进展

综述了制备聚有机硅氧烷改性环氧树脂的4种途径：含羟基或烷氧基的聚硅氧烷与环氧树脂的反应、含氨基的聚硅氧烷与环氧树脂的反应、含硅氢基的聚硅氧烷与环氧树脂的反应、含杂原子的聚硅氧烷与环氧树脂的反应,并讨论了聚有机硅氧烷改性环氧树脂对环氧树脂的相结构、机械性能和热稳定性的影响.     

The synergistic effect of dicyandiamide and resorcinol in the curing of epoxy resins

The synergistic effect of dicyandiamide (Dicy) and phenolic substances was studied, with resorcinol as a model compound. It was found that when Dicy and resorcinol are used jointly, the curing temperature of epoxy resin can be significantly lowered. FTIR and DSC data were used to illustrate the mechanism of the synergism. The addition of the phenolic hydroxyl group to epoxide was facilitated by Dicy, which favors the formation of phenoxy anions. The reaction of Dicy with epoxide was facilitated by resorcinol, which can exert “electrophilic assistance” for the addition of the amino group to epoxide. The presence of resorcinol also favors the addition of the hydroxyl group to the cyano group. The thermal and mechanical properties of the epoxy resins cured with Dicy/resorcinol or Dicy/phloroglucinol were studied. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1869–1874, 2003     

探讨低温固化涂料固化剂的选用

选择了国内外几种环氧固化剂,配制成环氧树脂涂料,比较了环氧涂料的物理性能和防腐性能,考察了环氧涂料在不同温度下的固化情况,探讨了固化剂对低温施工性能的影响。     

改性丙烯酸-环氧树脂纳米乳液的制备及应用

介绍了水性丙烯酸-环氧树脂纳米乳液的制备及其在油罐防腐工程中的应用,讨论了亲水侧链聚乙二醇相对分子质量大小对涂膜性能的影响,乳化剂各组分用量的改变对乳液粒径的影响。     

环氧稀释剂十二烷基缩水甘油醚的合成

对稀释剂十二烷基缩水甘油醚的合成及影响产品质量的因素进行了研究,并以十二、十四混醇为原料进行了对比试验。     

Epoxy-Polysulfone Networks as Advanced Matrices for Composite Materials

Compatibility between polysulfone (PSF) and epoxy oligomers in the melt state as well as the morphology and properties of alloys obtained were studied as a function of composition. The compatibility depends on the length and structure of epoxy molecules, and is best in the case of epoxysulfone oligomers (ESO).

The properties of hybrid matrices are determined by their composition and morphology. The most pronounced effects are observed in the regions of small concentrations of either component. A small quantity of PSF significantly improves thermal stability and heat resistance of the epoxy resin as well as its impact strength. On the other hand, on addition to PSF of small amounts of epoxysulfone oligomers, the processability of the matrix can be substantially improved. In particular, the melt viscosity decreases, and wetting and impregnation of fibrous reinforcement is facilitated. Besides, the matrix adhesion to fibers is increased.

Powdered PSF/ESO/curing agent mixtures are good for application in solvent-free technological processes of fibrous composites production, e.g. in electrostatic deposition of matrix particles onto a reinforcing fabric. Plastics based on hybrid matrices are distinguished by improved strength.     

环氧树脂/滑石粉、纳米蒙脱土水下胶粘剂研究

主要研究了滑石粉、有机化处理蒙脱土作为填料对水下环氧胶粘剂拉伸剪切强度的影响及蒙脱土与滑石粉协同作用效果,依此推荐了水下环氧胶粘剂的组份。     

纳米SiO_2粒子在环氧树脂中的分散工艺研究

研究了纳米SiO2在环氧树脂中的均匀分散工艺,探讨了超声波振荡和超声波分散时间对纳米SiO2/EP复合材料力学性能的影响,确定了最佳分散工艺。SEM表明,采用高剪切与超声波复合分散工艺比高剪切工艺的分散效果好;测试了复合材料的力学性能,进一步证明纳米SiO2具有增韧增强作用。     

W2-3乙烯基酯树脂在精细化工中的应用

研究了W2-3酚醛环氧乙烯基酯树脂在精细化工生产的许多环节中的防腐蚀应用,对实际工程应用提出了一些建议.     

有机硅乳液稳定性的研究

以阳离子型乳液聚合为例，详细讨论了聚合反应因素及环境因素对环氧改性有机硅乳液稳定性的影响。结果表明：在聚合反应温度为65℃、催化剂的用量为总加料量的0．3％～0．5％、硅烷偶联剂的用量为D4质量的3％～5％、乳化剂用量为总加料量的10％、阳／非离子型乳化剂的质量比为1．5～1．8、D4与水的质量比为0．3～0．4条件下，制得的环氧改性有机硅乳液稳定性良好；采取急冷的方式中止聚合反应，并以醋酸中和至pH值为6～7，有利于环氧改性有机硅乳液稳定性的提高。