Effect of phase structure on the adhesion properties of the dimethoxysilyl-terminated polypropylene oxide/epoxy resin system

Silyl-crosslinked urethane elastomer modifying epoxy resin has drawn much interest. Here the triethoxysilyl-terminated polycaprolactone elastomer (PCL-TESi) modifying diglycidylether of bisphenol A epoxy resins (DGEBA) system was chosen, and then the effect of the type of curing agent on the phase structure of the studied epoxy resin system was investigated. The modified systems were obtained with different phase structures by varying the formulations of the curing agent. It was experimentally shown that with the addition of aminosilane (KBE-9103), the crosslinked density was greatly increased. The cured system also showed from SEM and TEM analysis that addition of KBE-9103 increased the compatibility between the PCL-TESi and DGEBA, which made the ductility of the system decrease, but also indicated from TEM that addition of much KBE-9103 made the reacted silicone particles coagulate each other. The state of phase separation from TEM in the cured system was theoretically explained. These would serve the deeper studies of the mechanism of silyl-crosslinked urethane elastomer modifying epoxy resin in the future.

Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Kbe-9103/kb-2 Formulation On The Change In Mormentioning

confidence: 99%

Section: Effect Of the Kbe-9103/kb-2 Formulation On The Phase Structumentioning

confidence: 99%

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Morphology of epoxy resin modified with silyl‐crosslinked urethane elastomer

Liu¹,

Lin²,

Ding³

et al. 2005

“…These white domains are DGEBA cured by DMP, and DMSi–PPO is indicated as matrix. It is already known that this cured system shows a phase‐separated structure 26, 27. During the phase‐separation process between DMSi–PPO and DGEBA, the DGEBA gathered itself in the DMSi–PPO matrix because the value in solubility parameter of the DGEBA (9.94 cal/cm 3 ) 1/2 was higher than that of the DMSi–PPO (7.85 cal/cm 3 ) 1/2 .…”

Section: Resultsmentioning

confidence: 92%

“…Therefore, the cured system has a phase‐separated structure with the DMSi–PPO network as the matrix phase reinforced by dispersing DGEBA microparticles. There are reports in the literature on the relationship between adhesion strength and the phase structure of the DMSi–PPO/DGEBA system against an aluminum substrate 26–27. We had previously raised concerns about the adhesion strength and interfacial chemistry of a DMSi–PPO/DGEBA blended system against some polymeric materials that have a lower surface free energy than the metal substrates.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic work of adhesion and peel adhesion energy of dimethoxysilyl‐terminated polypropylene oxide/epoxy resin system jointed with polymeric substrates

Okamatsu

Yasuda

Ochi

2001

Self Cite

ABSTRACT:The characterization of the interfacial surface of a dimethoxysilyl-terminated polypropylene oxide (DMSi-PPO)/diglycidylether of bisphenol A (DGEBA) system, which has the phase structure of DGEBA particles in a DMSi-PPO matrix, was investigated by using model joints with polymeric substrates. The surface free energy (␥) of the DMSi-PPO/DGEBA system had varied with the ␥ of each substrate. When the system contacted to low surface free energy materials such as Teflon, polypropylene, and polyethylene, the ␥ of the system showed about 14.3-31.6 mJ/m 2 ; on the other hand, when the system contacted to high surface free energy substrates such as polyethylene-telephthalate and polyimide, the ␥ of the system showed 50.4 and 64.6 mJ/m 2 , respectively, because the concentration of the DGEBA as a polar component in the system changed around these interfaces. In the low surface energy substrates used, the actual peel adhesion energy value was in good agreement with the thermodynamic work of adhesion (Wa) determined independently. However, in the high surface energy materials used, the peel adhesion energies were 10 3 -10 4 times larger than Wa because the energy was dissipated viscoelastically at the jointed points.

Microstructure and thermal properties of silyl‐terminated polycaprolactone–polysiloxane modified epoxy resin composites

Liu

Lin

Song

et al. 2008

With a direct nucleophilic addition between À ÀOH groups of polydiol and À ÀNCO of a silane, a blend of silyl-terminated polycaprolactone PCL-Si and silyl-terminated polydimethylsiloxane PDMS-Si oligomer, PCS-2Si, were firstly prepared, and then blended with a commercial epoxy resin (diglycidyl ether of bisphenol-A, DGEBA) to form a ternary composite. The formed ternary composites of different content of DGEBA were cured using a polyamidoamine as a curing agent and a sol-gel process at ambient temperature. The microstructures and properties of the cured composites were investigated by SEM, TGA, and energy dispersive spectroscopy. The results showed the compatibility between DGEBA and PDMS increased with increasing content of PCS-2Si, but higher content of PCS2Si resulted in a slight enrichment of silicon in the surface of the cured film. TGA showed that incorporating PCS-2Si into epoxy resin altered the composites' thermal stability and degradation characteristics.