环氧丙烯酸树脂的合成研究

研究合成了一种环氧丙烯酸树脂,该树脂既具有环氧树脂优良的黏结性能、收缩率低等特点,又克服了其抗冲击性差的缺点,还可以室温固化,应用广泛.     

微波固化环氧树脂／氨基二苯醚树脂的耐热性能研究

以二苯醚树脂(DPO)为原料，合成了一类新型耐高温树脂一氨基二苯醚树脂(ANDPO)，用作双酚A环氧树脂(EP)的固化剂，以提高环氧树脂的耐热性。采用微波技术固化EP／ANDPO体系。通过FTIR定量研究了EP／ANDPO体系的反应程度，利用差示扫描量热法(DSC)和热重分析法(TG)研究了固化体系的耐热性能，并与热固化进行了比较。结果表明：微波固化显著提高了体系的固化速度和热性能。体系转化率为95％时，400W的微波只需10min即可完成固化，而热固化需要在150℃固化240min。微波固化产物的Tg、表观分解温度TA、温度指数Tzg分别为172．6℃、322℃和200℃。而热固化产品的Tg、TA、Tzg分别为163．5℃、306℃和189℃。两种固化方式所得产品的TA、Tzg均高于目前所用的芳香族胺类固化剂，显著提高了环氧树脂的耐热性能。     

酚醛胺(T-31)环氧树脂固化剂之浅谈

介绍了酚醛胺(T-31)系列环氧固化剂及原料的现状和特点,并对酚醛胺(T-31)系列环氧固化剂进行了分代,阐述了第三代酚醛胺(T-31)系列环氧固化剂的系列化、专用化、高档化。预测和展望了2005年的需求和方向。     

新型环氧树脂固化剂2-烷基苯并咪唑的研究

用实验室自制的2-烷基苯并咪唑做环氧树脂固化剂,通过示差扫描量热法(DSC)、凝胶实验、FT IR等方法研究其与环氧树脂E-51的固化过程,发现取代基碳链增加,潜伏性增加,并且有很好的力学性能和吸湿性。初步探讨了2-烷基苯并咪唑的固化机理,结果发现其与烷基咪唑近似,同样遵循Heise固化机理。     

Estimation of Concentration of Particles in Polymerizing Fluid during Centrifugal Casting of Functionally Graded Polymer Composites

The concentration of uniformly distributed particles in a fluid changes with time in the direction of gravitational or centrifugal force to form a concentration gradient. The change in the concentration is an outcome of velocity variation of particles in a fluid. A modified equation for terminal velocity, v _m of particles in polymerizing-fluid under centrifugal force is proposed to estimate the changes in the volume fraction of particles in the graded composites. The proposed equation introduces the effect of cure kinetics of polymer and its effect on particle movement in the model that was based on the modified Stoke’s law, considering the parameters related to particle hindrance, centrifugal force, particle dimensions, viscosity variation etc. The model predictions of concentration changes at the different locations of samples were compared with calcium carbonate filled polysulphide-modified-epoxy graded composites prepared by centrifugal casting.. The effect of particle size, delayed curing rate of matrix were explored. The simulated results are in good agreement with those of experiments.     

Preparation and self‐assembly of poly(diglycidyl maleate‐co‐stearyl methacrylate)

Poly(diglycidyl maleate‐co‐stearyl methacrylate) (P(DGMA‐co‐SMA)) with reactive epoxy groups was synthesized by reaction of poly(maleic anhydride‐co‐stearyl methacrylate) (P(MA‐co‐SMA)) and epichlorohydrin. The effect of precipitant on self‐assembly behaviors of the resultant copolymer was investigated. It was found that vesicles and nanotubule liked aggregates can be obtained through self‐assembly of P(DGMA‐co‐SMA) in THF solution using CH₃CH₂OH (EtOH) as precipitant while spheral aggregates can be obtained using H₂O as precipitant. The mechanism of the self‐assembly behavior was discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

S2/TDE85复合材料耐自然库存与加速湿热老化的性能研究

本文对高强2号玻璃纤维（S2）增强环氧（TDE85－MCD体系）基复合材料单向板经自然库存与加速湿热老化后力学性能的变化进行了研究。研究结果表明，温度和湿度的作用会使单向板的拉伸、弯曲、剪切性能有所降低；温度越高、湿度越大，力学性能变化越大；可用加速湿热试验值来表征自然库存条件下的试验值。     

新型环氧防腐涂料的研究

采用在环氧树脂中加入纳米复合铁钛粉防锈颜料WD—D-325、固化剂、制备了新型环氧树脂防腐涂料。由于纳米技术的特性，该防腐涂料具有较高的防腐性、优异的附着力和柔韧性。实验确定了复合铁钛粉防锈颜料在环氧防腐涂料中的添加量。作为新型的环保颜料，复合铁钛粉防锈颜料可以替代红丹、锌铬黄等颜料。     

以氨基笼型倍半硅氧烷为固化剂的环氧树脂灌封胶

用笼型β-氨乙基-γ-氨丙基倍半硅氧烷(CAAPOSS)和4,4-二氨基二苯醚(DDO)为固化剂,间苯二酚双缩水甘油醚为活性稀释剂,制备了双酚-A型环氧树脂灌封胶,并研究了胶粘剂各组分从而获得了较高的物理机械性能。测定了与碳钢的粘接强度,热性能和耐老化性能。结果表明,该胶粘剂是一种热稳定性好、耐高温、粘度低的优良结构胶粘剂。     

Self-emulsifiable soybean oil phosphate ester polyols for low-VOC corrosion resistant coatings

A series of soybean oil phosphate ester polyols (SOPEP) was prepared by reaction of fully epoxidized soybean oil with phosphoric acid and simultanoeous hydrolysis in the presence of a polar solvent. The polyols were characterized by determination of acid value, oxirane number, hydroxyl value, molecular weight (GPC), and FTIR spectra. These polyols with varying amounts of acid phosphate groups could be self-emulsified to form aqueous dispersions after neutralization with organic base. These aqueous dispersion showed varying degrees of stability and their appearance ranged from opaque dispersions to translucent to clear solutions. Waterborne coating compositions were prepared using these aqueous dispersions as principal components and their thermally cured film properties were studied. it was found that by careful selection and formulation, SOPEPs can be successfully used for low-VOC waterborne coating formulations. SOPEPs with 3.5% phosphate ester content showed visibly superior corrosion resistance properties.