Adhesion of PBO Fiber in Epoxy Composites

The high mechanical and thermal performance of poly p-phenylene- 2, 6-benzobisoxazole ( PBO ) fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T.However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet (UV)irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fibermatrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the barrier effect of the finish.For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy (AFM) topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fiber is sensitive to surface treatment conditions as revealed by a bimodal Weibull statistical distribution analysis. Considerable strength reduction occurred, particularly for cases of acidic and plasma treatments, while UV irradiation shows the better ability to retain fiber strength.     

玻璃鳞片胶泥在煤气管道中的应用

介绍了呋喃树脂、环氧改性糠醇树脂的性能、反应机理，以及玻璃鳞片的规格与用量，惰性填科等对涂膜耐化学性、施工性的影响。通过试验研制出玻璃鳞片胶泥，成功地应用于首钢搬迁工程的煤气管道中，有效地保护了管道，提高了使用寿命。     

彩色涂料印花色浆罩印性能的研究

介绍了涂料印花罩印助剂的制备和应用，通过对涂料罩印浆的物理化学性能的研究，探讨了提高罩印效果的途径及罩印助剂颗粒的物理化学性质对罩印效果的影响。     

道路标志改性反光涂料的制作

按表1配比将松香加入装有冷凝器、温度计和带搅拌浆的反应瓶中,用N_2置换,再升温至150℃使松香熔融,边搅拌边缓慢加入改性剂,同时加入助剂、色彩填料,将反应瓶温度逐渐调节到230℃时保温2小时,再将温度调节到260℃,并保温8小时以上,使反应得以充分进行。反应完成后经加热蒸馏,将低沸点组分除去,最后得到的产品即改性松香树脂。     

CM活性填料对涂料防护性能的改进

根据发明研究了ＣＭ活性填料对涂层耐渗透和抗紫外线辐护影响。这类活性填料能广泛地改进非水涂料的性能，极大地提高涂层的防护能力。