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T. Kasemura C. Komatu H. Nishihara S. Takahashi Y. Oshibe H. Ohmura T. Yamamoto 《The Journal of Adhesion》1994,47(1):17-29
In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si2p and O1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents. 相似文献
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采用氨基硅油对环氧树脂(E-51)进行增韧改性研究。探讨了改性工艺、氨基硅油的用量对环氧树脂涂层的表观和力学性能的影响;比较了环氧树脂改性前后的化学结构和热稳定性。结果表明,6 %氨基硅油与环氧树脂E-51室温混合,再在50 ℃下搅拌反应1 h,冷却后添加固化剂,涂片、室温固化24 h,所得的涂层综合性能最佳,冲击强度可达41 kg.cm,附着强度可达 6.800 MPa,空气气氛下骨架的最初分解温度可达332.1℃;改性过程中,氨基硅油上的伯胺与环氧树脂上的环氧基反应生成了仲胺,两者以C-N-C的形式键合在一起。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(18-19):2301-2314
Abstract This paper describes the influence of polydopamine surface modifications on the adhesion strength of electroless deposited copper on roughened epoxy resin substrates. The surfaces are characterized with XPS and ToF-S-SIMS. Next, a thorough investigation of the copper–epoxy interface is performed using SEM. Both the polydopamine modification and the variation of the electroless plating bath temperature lead to new insights into the different contributions of chemical and physical adhesion to the overall adhesion strength. 相似文献
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先后利用Fenton试剂和缩水甘油氧丙基硅烷偶联剂(KH560)对碳纳米管(CNTs)进行表面修饰,制备了不同种类的环氧树脂(EP)/CNTs复合材料并对其性能进行了研究。结果表明:CNTs经过Fenton试剂处理后,其表面成功引入羟基,进一步用KH560修饰后成功地引入了环氧基官能团。Fenton试剂的组成可以有效控制羟基基团的数目,并进一步决定环氧基官能团的数目。单独采用Fenton试剂处理或Fenton试剂和KH560共同处理都可以改善CNTs的分散性能,提高EP/CNTs复合材料的玻璃化温度(Tg)和热稳定性能,但后者的处理效果更好。 相似文献
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环氧树脂增韧增强改性研究进展 总被引:27,自引:2,他引:27
综述了国内环氧树脂增韧增强改性的最新研究进展,详细介绍了纳米粒子、液体橡胶、热塑性树脂、原位聚合物、液晶聚合物、核壳聚合物、大分子固化剂和膨胀型单体增韧增强环氧树脂的一些重要研究现状。对它们的增韧增强环氧树脂的优缺点和机理进行了探讨。 相似文献
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通过钛酸酯偶联剂处理氮化铝(AlN)粉末,采用机械分散和超声波分散相结合的方法,制得环氧树脂/AlN复合材料。实验表明,钛酸酯偶联剂能有效地改善AlN粉末的表面性能,偶联剂质量分数为6%时,改性效果最好;AlN填料质量分数为10% ̄20%时,复合材料的冲击韧性较好。冲击断口形貌分析表明,河流状裂纹越窄,数量和分支越多,扩展路径越长,冲击韧性越好,A l N填料改性效果也越好。 相似文献
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以双酚A和环氧氯丙烷为原料,通过缩聚反应制得环氧树脂;将硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)在酸催化下水解,得到水解物。探讨了KH-570及其水解物用量对环氧树脂胶黏剂拉伸剪切强度的影响。结果表明,不加KH-570及其水解物时,环氧树脂胶黏剂的拉伸剪切强度最大为2.47 MPa;只加KH-570水解物时,环氧树脂胶黏剂的拉伸剪切强度最大为3.28 MPa;只加入KH-570时,环氧树脂胶黏剂的拉伸剪切强度最大为5.23 MPa。在KH-570水解物与环氧树脂的质量比相同条件下,随着KH-570用量的增大,环氧树脂胶黏剂的剪切强度先增后减,在KH-570的用量为环氧树脂质量的15%时达到最大;相同KH-570用量下,随着KH-570水解物用量的增大,环氧树脂胶黏剂的剪切强度先增后减,在KH-570水解物和环氧树脂的质量比为5∶5时达到最大。当KH-570的用量为环氧树脂质量的15%、KH-570水解物与环氧树脂的质量比为5∶5时,环氧树脂胶黏剂的拉伸剪切强度达到9.36 MPa。 相似文献
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采用表面包覆法对钛酸钾晶须(PTW)进行包硅处理,并用硅烷偶联剂KH550和KH560对包硅后的PTW进行表面改性,利用扫描电子显微镜和X射线荧光光谱对PTW进行分析。制备了环氧树脂(EP)/PTW复合材料,考察了改性方法、晶须含量、偶联剂种类等对复合材料拉伸强度、弯曲强度的影响。结果表明,KH560改性后的PTW能够较好地分散于EP中,对拉伸强度能够起到增强作用,当PTW用量为5份时,复合材料拉伸强度达到最大值45.33 MPa,断裂伸长率为3.19%,弯曲强度为171.41 MPa。 相似文献
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Regarding the function of the silicone release agent, the following two mechanisms, that is, the low energy surface of a cross-linked methyl hydrogen polysiloxane (MHPS) resin and the separation of a non-cross-linkable dimethyl polysiloxane (DMPS) oil itself have been compared. The 180° peel strength of the glass plate/silicone release agent/pressure sensitive adhesive (PSA) tape laminates decreased in the following order: un-coated > MHPS-coated > DMPS-coated glasses. ATR, ESCA and SEM observations of the PSA and glass surfaces after the peel test showed that no MHPS transferred from the glass surface to the PSA but a part of the DMPS transferred. From these results, it was concluded that, for decreasing peel strength, the separation of silicone oil (DMPS) itself is more effective than the low energy surface of the silicone resin (cross-linked MHPS). 相似文献
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The effects of rubber content, rate of peel and temperature on peel strength of ATBN modified DGEBA based epoxy resin adhesives have been investigated. The fracture surfaces of peel test specimens and the distribution of rubber particles in cured bulk epoxy resin have been observed with SEM and TEM, respectively. The mechanical properties of bulk rubber modified epoxy resin have been also measured. The peel strengths increased with increasing rubber content, peel rate, and decreasing temperature. The peel strengths were superposed as a function of rate and temperature. Plots of the shift factors against temperature gave two straight lines, which followed an Arrhenius relationship. The region of temperature below the intersection of the two straight lines, temperature somewhat lower than Tg of epoxy adhesive, gave markedly high peel strengths and a stick-slip failure due to plastic deformation of the adhesive, and a number of micro holes produced by the rupture of rubber micro particles on the fracture surface. The region of temperature above the intersection gave lower peel strengths and an apparent interfacial failure with ductile fracture of the adhesive, and larger, shallow holes or no holes. From these results, the marked increase of peel strength was concluded to be mainly attributed to the plastic or viscoelastic deformation of epoxy matrix, the strong bond at the interface between rubber particles and epoxy matrix, and the dilation and rupture of a number of rubber particles. 相似文献
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旨在提高凹凸棒石在环氧丙烯酸酯中的力学性能及分散性能,以凹凸棒石纳米粉体为载体,采用化学沉淀法制备出包硅凹凸棒石复合纳米材料(Si O2/ATP),再用硅烷偶联剂KH570对Si O2/ATP表面进行有机改性,制得KH570-g-Si O2/ATP复合材料。通过TEM、FTIR、XRD及TG对复合材料进行表征。采用共混法制备了紫外光固化复合涂层,考察了KH570-g-Si O2/ATP的添加量对复合涂层耐冲击力、柔韧性的影响。结果表明,当KH570-g-Si O2/ATP的用量占涂料总重量的5%时,与EA涂层相比,复合涂层的耐冲击力的高度由15 cm增加至35 cm;涂膜的柔韧性由15 mm提升至5 mm;此外,与ATP、Si O2/ATP以及KH570-g-ATP相比,KH570-g-Si O2/ATP在EA涂层中具有良好的分散性,EA涂层的力学性能也得到明显改善。 相似文献
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We made clear the cause of the increase in peel strength of pressure sensitive (PS) adhesives as a function of contact time, and investigated how to modify PS adhesives to maintain a low and constant peel strength for a long time. It was found that polar groups in the adhesive orient to the interface between the adhesive and the (stainless steel) metal substrate (SUS 304) so as to minimize interfacial free energy during adhesion, and the orientation increased affinity between the adhesive and the metal material and increased the peel strength as a result. The use of modifier which contained both P(MMA-co-SiMA) and PDMS showed an excellent modification effect, although modification with only PDMS or P(MMA-co-SiMA) was not sufficient. It was suggested that PDMS which migrated to the surface was extended uniformly over the surface by PDMS segments of P(MMA-co-SiMA) and that the enriched layer of PDMS on the adhesive surface worked as a barrier to prevent the orientation of polar groups in bulk. Therefore, low and constant peel strength could be achieved. 相似文献
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We made clear the cause of the increase in peel strength of pressure sensitive (PS) adhesives as a function of contact time, and investigated how to modify PS adhesives to maintain a low and constant peel strength for a long time. It was found that polar groups in the adhesive orient to the interface between the adhesive and the (stainless steel) metal substrate (SUS 304) so as to minimize interfacial free energy during adhesion, and the orientation increased affinity between the adhesive and the metal material and increased the peel strength as a result. The use of modifier which contained both P(MMA-co-SiMA) and PDMS showed an excellent modification effect, although modification with only PDMS or P(MMA-co-SiMA) was not sufficient. It was suggested that PDMS which migrated to the surface was extended uniformly over the surface by PDMS segments of P(MMA-co-SiMA) and that the enriched layer of PDMS on the adhesive surface worked as a barrier to prevent the orientation of polar groups in bulk. Therefore, low and constant peel strength could be achieved. 相似文献