Effect of plasticizer on the thermal, mechanical, and anticorrosion properties of an epoxy primer

Rodriguez, Maria Teresa Raya; García, Santiago; Cabello, R.; Suay, J.; Gracenea, J.J.

doi:10.1007/s11998-005-0015-9

Cited by 17 publications

(24 citation statements)

References 15 publications

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“…[24][25][26] Thus, the increase in peak maximum value and shift toward lower temperature can be attributed to the lower crosslink density, as a result of the decreased epoxy functionality as well as a plasticizing effect from the alcohol modification of the resins. [27][28][29] An interesting observation of the tan d curves is their broadening. Figures 9a and 9b show that the increase in the compositional amount of EP increases the breadths of the tan d peaks.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance

Harkal

Muehlberg

et al. 2010

J Coat Technol Res

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The synthesis, characterization, and coatings performance of a series of glycidyl carbamate (GC) resins synthesized from a hexamethylene diisocyanate biuret resin, glycidol, and alcohols were explored. The partial replacement of glycidol with alcohols was explored as a way to reduce the viscosity of multifunctional GC resins. Six modified GC resins were obtained by replacing one-third of the glycidol with alcohols and ether alcohols. The modified GC resins were characterized using FTIR and 13 C NMR. The alcoholmodified GC resins had significantly lower viscosity than that of the control GC resin. The effect of amount of alcohol modifier on resin viscosity was also studied by making a series of resins with different levels of modifier. Both amine-cured and self-crosslinked coatings were prepared from the resins. Coating properties such as hardness, impact strength, methyl ethyl ketone double rubs, flexibility, and adhesion were studied. Differential scanning calorimetry and thermogravimetric analysis were also used to study the thermal properties of the coatings. The resin structures and their coating performance showed an excellent correlation. The coating performance was found to be governed by the type of modifier, structural compositions of the modifier in the resins, type of amine crosslinkers, and techniques of crosslinking used.

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Section: Dynamic Mechanical Analysismentioning

confidence: 99%

The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance

Harkal

Muehlberg

et al. 2010

J Coat Technol Res

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“…Metal‐rich coatings are ubiquitous in paint applications but the need for improvement motivates numerous studies. Metal‐rich hybrid paints attracted much attention because of their improved performance 1, 2 and lower environmental hazard 3, 4. Combination of freestanding intrinsically conducting polymers (ICPs) with zinc in the paints ensures increased protection connecting to the ICP facilitated barrier behavior and inhibited sacrificial action of zinc.…”

Section: Introductionmentioning

confidence: 99%

MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

et al. 2013

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The thiamine diphosphate‐dependent enzyme 2‐succinyl‐5‐enolpyruvyl‐6‐hydroxy‐3‐cyclohexene‐1‐carboxylate synthase (MenD) catalyzes a Stetter‐like 1,4‐addition of α‐ketoglutarate to isochorismate in the biosynthesis of menaquinone (vitamin K). Here, we describe the carboligation potential of MenD from Bacillus subtilis (BsMenD) for the nonphysiological 1,2‐addition of decarboxylated α‐ketoglutarate (succinylsemialdehyde) and various benzaldehyde derivatives. Furthermore, we engineer BsMenD variants for the enantiocomplementary asymmetric synthesis of functionalized α‐hydroxy ketones. Wild type BsMenD shows an excellent chemo‐ as well as high (R)‐selectivity for the carboligation of α‐ketoglutarate as the donor, and different benzaldehyde derivatives as acceptor yielding (R)‐α‐hydroxy ketones with up to >99 % ee. By engineering (S)‐selective BsMenD variants, based on the recently developed S‐pocket concept, we provide access to most of the corresponding (S)‐α‐hydroxy ketones with up to 98 % ee. In particular, benzaldehyde and meta‐substituted derivatives were converted with high enantioselectivities (ee of 91–98 % (S)). The significantly higher (S)‐selectivity of BsMenD variants than recently published MenD variants from Escherichia coli, could be attributed to a second‐shell residue next to the S‐pocket. A glycine residue, adjacent to the major S‐pocket residues I476 and F477 (standard numbering), is assumed to result in higher structural flexibility in the S‐pocket region of BsMenD, which in turn could result in improved stabilization of the antiparallel orientation of the acceptor.

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“…Metal‐rich paint coatings attracted much attention because of their reliable corrosion protection performance. Basic aspect of the protection relies on intense sacrificial action of the metallic pigments such as zinc, aluminum, magnesium, ensuring stable immunization of steel 1–3 and aluminum alloys 4. As prominent members of such coatings, galvanic function of the liquid ZRPs was studied to reveal relationship between the sum of anodic currents and open circuit potentials (OCPs) 5.…”

Section: Introductionmentioning

confidence: 99%

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

Gergely

Pászti

Bertóti

et al. 2012

Materials & Corrosion

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Utilization of various types of multi‐walled carbon nanotubes (MWCNTs) in zinc‐rich paints (ZRPs) is presented addressing percolation and porosity related phenomena of traditional ZRPs. Hybrid paint coatings were formulated with 3.21 wt% polypyrrole (PPy) deposited alumina‐MWCNT inhibitor particles (PDAMIPs) and 70 wt% zinc contents. Corrosion protection behavior of the hybrid coatings was investigated by electrochemical impedance spectroscopy (EIS), glow‐discharge optical emission spectroscopy (GD OES), X‐ray photoelectron spectroscopy (XPS), and FT‐Raman spectroscopy. Immersion and salt‐spray chamber tests gave evidence of improved galvanic protection and barrier nature of the hybrid coatings over the conventional ZRPs, whereas inhibited zinc corrosion and ignorable steel corrosion took place besides lower degradation of the binder. Zinc‐rich hybrid paints with either high relative amount of polyelectrolyte‐modified or low proportion of functionalized MWCNTs afforded enhanced corrosion prevention. This result is partly attributed to the nanotube volume fractions around the threshold of infinite cluster formation contributing to electrical percolation and galvanic action of the hybrids. Experimental results are discussed in a broader context on the basis of structure related findings of the PDAMIPs (described in Part I) and in the light of recent literature data. From the newly developed inhibitor particles, some of them are respected as worthy additives for application in hybrid coatings featuring high performance corrosion prevention functionality.

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Effect of plasticizer on the thermal, mechanical, and anticorrosion properties of an epoxy primer

Cited by 17 publications

References 15 publications

The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance

The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance

MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

Novel zinc‐rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel: Part II: Corrosion prevention behavior of the hybrid paint coatings

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