Influence of solvent composition and degree of reaction on the formation of surface microtopography in a thermoset siloxane–urethane system

Majumdar, Partha

doi:10.1016/j.polymer.2006.02.085

Cited by 29 publications

(14 citation statements)

References 39 publications

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“…37 An additional study indicated that mixing time, after the crosslinker addition, has an effect on the formation of microstructured surface. 38 In this study, drawdowns were made over 3 in x 6 in aluminum panels by varying the mixing time from 1 to 7 h with the same formulation. AFM study under tapping mode over a 40 lm x 40 lm area revealed that the structured surfaces were formed in the coatings when the mixing time was between 3 and 6.5 h. In order to study the variation in the domain size across a single coating, AFM images were taken at three different 40 lm There was no significant difference between the siloxane-urethane coatings with and without structured surfaces with respect to the static surface energy.…”

Section: Resultsmentioning

confidence: 99%

“…This might be due to the existence of diffuse silicone- rich regions at the surface when the time of mixing was short. 38 Hence, the surface was more chemically heterogeneous to both polar and dispersive interactions. The values of water contact angle hysteresis decreased with the longer mixing time and all the structured surfaces had lower hysteresis values as compared to the nonstructured surfaces with shorter mixing time.…”

Section: Resultsmentioning

confidence: 99%

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High throughput combinatorial characterization of thermosetting siloxane–urethane coatings having spontaneously formed microtopographical surfaces

et al. 2007

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High throughput combinatorial characterization was performed on thermosetting siloxaneurethane coatings in order to find a correlation between the characterization techniques, surface topography, and adhesion strength of barnacles. A series of coatings having microtopographical surfaces with different domain sizes were prepared based on a thermosetting siloxane-urethane system. This microtopography was formed spontaneously during the filmformation process. These surfaces were characterized by atomic force microscopy (AFM), surface energy, dynamic contact angle, and pseudo barnacle pull-off adhesion and were compared to pure polyurethane (PU) and silicone rubber control. Surface energy and dynamic contact angles were measured by an automated surface energy measurement system and pull-off adhesion values were obtained from a high throughput pull-off adhesion measurement unit. The results were compared with the adhesion strength of barnacles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High throughput combinatorial characterization of thermosetting siloxane–urethane coatings having spontaneously formed microtopographical surfaces

et al. 2007

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“…(1 Synthesis of 3,7,11-trimethyl-2,6,10-dodecatrien-1dicarboethoxyester (2) via a Knoevenagel condensation 30.0 g (0.14 mol) of (1), 15.9 g (0.15 mol) of diethylmalonate, 16.1 g (0.20 mol) of pyridine and 2.90 g (0.03 mol) of piperidine were added together and heated at 1208C under inert nitrogen gas for 4 h. After cooling down, 150 mL of diethylether was added. Then, the solution was washed with 200 mL of 1N HCl and three times with 200 mL of a saturated NaCl/NaHCO 3 solution.…”

Section: Methodsmentioning

confidence: 99%

Farsenol‐modified biodegradable polyurethanes for cartilage tissue engineering

Eglin

Grad

Gogolewski

et al. 2009

J Biomedical Materials Res

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A bifunctionalized 3,7,11-trimethyl-2,6,10-dodecatrien-1-diaminobutane amide (isoprenoid) was obtained from 3,7,11-trimethyl-2,6,10-dodecatrien-1-ol (farnesol) in a three-step synthesis. The bifunctionalized isoprenoid was characterized using infrared spectroscopy and (1)H and (13)C nuclear magnetic resonance spectroscopy and was covalently incorporated (0.12 mmol x g(-1)) into the biodegradable aliphatic polyurethane formed on the polycondensation reaction of poly(epsilon-caprolactone) diol, 1,4,3,6-dianhydro-D-sorbitol and 1,6-hexamethylene diisocyanate. Although the covalent incorporation of the isoprenoid molecule into the polyurethane chain modified the surface chemistry of the polymer, it did not affect the viability of attached chondrocytes. Porous 3D scaffolds were produced from the modified and unmodified biodegradable segmented polyurethanes by a salt leaching-phase-inverse technique. The scaffolds were seeded with bovine chondrocytes encapsulated in fibrin gel and cultured in vitro for 14 days. The incorporation of bifunctional isoprenoid into the polyurethane affected the morphology of the scaffolds produced, when compared with the morphology of the scaffolds produced using the same technique from the unmodified polyurethane. As a consequence, there was more uniform cell seeding and more homogeneous distribution of the synthesized extracellular matrix throughout the scaffold resulting in a reduced cell/tissue layer at the edges of the constructs. However, glycosaminoglycan (GAG), DNA content, and chondrocytes phenotype in the scaffolds produced from these two polyurethane formulations did not vary significantly. The findings suggest that the change of surface characteristics and the more open pore structure of the scaffolds produced from the isoprenoid-modified polyurethane are beneficial for the seeding efficiency and the homogeneity of the tissue engineered constructs.

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“…The size and area distribution of the microdomains can be controlled by varying the solvent used in preparing the coatings and the time of mixing in solution prior to deposition also affects the formation of microdomains as well as their size [136]. The presence of the surface microdomains was shown to decrease the adhesive strength of barnacles [137].…”

Section: Surface Microtopographymentioning

confidence: 99%

New Directions in Antifouling Technology

Chisholm

2009

Biofouling

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The aim of this chapter is to survey approaches being explored to combat or mitigate fouling, with a primary focus on coating systems. Biocidal coating systems (systems which release biocidal chemicals into the environment) are surveyed, beginning with current self-polishing coatings technology, continuing with new approaches being explored for self-polishing and erodible binder systems, and concluding with a discussion on the use of natural antifoulants and their synthetic analogues as a low-toxicity approach to antifouling. Approaches to non-toxic coating systems are then surveyed beginning with a discussion of the fouling-release concept. Non-toxic coating systems containing bound biocides, hybrid-coating systems, coatings having amphiphilic surfaces and other approaches reported in the literature are also discussed. Many of these new approaches are still in the research stage. By reviewing current research efforts in this field, it is hoped that additional innovative approaches will be stimulated, which can lead to environmentally responsible antifouling coating systems.

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Influence of solvent composition and degree of reaction on the formation of surface microtopography in a thermoset siloxane–urethane system

Cited by 29 publications

References 39 publications

High throughput combinatorial characterization of thermosetting siloxane–urethane coatings having spontaneously formed microtopographical surfaces

High throughput combinatorial characterization of thermosetting siloxane–urethane coatings having spontaneously formed microtopographical surfaces

Farsenol‐modified biodegradable polyurethanes for cartilage tissue engineering

New Directions in Antifouling Technology

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