Mechanical and surface properties of polysulfide‐based polyurea modified with aminoethylaminopropyl poly(dimethylsiloxane)

Conventional expandable polystyrene (EPS) was modified by the preparation of copolymers containing 0.10%, 0.25%, and 0.50% silicone acrylate. Copolymeric expandable polystyrene (CEPS) samples were characterized with various techniques.1 H-NMR spectroscopy was used for the determination of composition, and gel permeation chromatography was used for the determination of molecular weight and molecular weight distribution. Differential scanning calorimetry showed that the glass-transition temperatures of the CEPS samples increased with an increasing silicone acrylate content. The surface properties of the copolymers were investigated by contact angle measurement and SEM imaging.

Section: Resultssupporting

confidence: 93%

Structural modification of expandable polystyrene. II. Copolymerization with silicone acrylate

Taşkıran

Sunal

Uyanık

2006

“…The surface‐water‐air contact‐angle measurements were more surface‐sensitive and probably responded to the outermost monolayer of the surface 33. The contact angles of PUs and PUAs were listed in Table IV.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of novel polyurethane acrylates based on soy polyols

Wang

Chen

et al. 2011

Novel polyurethane acrylates (PUAs) were prepared by the reaction of soy polyols with isophorone diisocyanate and hydroxyethylacrylate. FTIR results confirmed the formation of PUAs from different kinds of soy polyols. The glass transition, damping properties, thermal stabilities, and mechanical properties of PUAs were characterized by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and universal test machine. The morphology of PUAs was investigated by scanning electron microscope (SEM). The results of the swelling experiments showed that the crosslinking density of polyurethanes and PUAs directly correlated with the hydroxyl (OH) number of polyols. The DSC and DMA results displayed that the glass transition temperature of PUAs was higher than that of polyurethanes and increased with OH number. Furthermore, the formation of PUA networks improved the damping properties of polyurethanes. TGA results demonstrated the acrylation of polyurethanes improved its thermal stability. The initial decomposition temperature of polyurethanes and PUAs also increased with OH number. When compared with polyurethanes, the tensile strengths of PUAs were improved by 118%, 39%, and 9%, respectively, with the increase of OH number of three soy polyols.

“…Many publications can be found on the characterization of polysulfide cured by metal peroxides,5–9 reporting the results of thermogravimetry analysis, dynamic mechanical analysis, tensile strengths, and hardness testing. Thermal stability and photodegradation of the liquid polysulfide and cured polysulfide were also studied by Mahon et al10, 11 In our earlier research work, structure, mechanical properties, and modification of polysulfide‐based sealants have been studied 12–16…”

Section: Introductionmentioning

confidence: 97%

Effect of filler on the compression set, compression stress–strain behavior, and mechanical properties of polysulfide sealants

Zhang

Chang

et al. 2010

In this work, investigations were made on the mechanical properties, stress-strain behavior during compression, swelling and compression set properties of polysulfide sealants at different carbon black and silicon dioxide loadings, and dynamic mechanical thermal analysis was also presented. The results reveal that carbon black filler indeed has significant effects on reinforcing mechanical properties of polysulfide sealants. Increasing carbon black loading improves the tensile strength of sealants promptly, but compression performance increases slowly. The simultaneous use of carbon black and silicon dioxide filler in polysulfide sealants hardly changes the tensile strength of sealants, whereas the ultimate elongation and compression performance of sealants are enhanced remarkably.