Crosslinking of Saturated Elastomers With Diazides. Part I: Mechanical Properties of Vulcanizates

Zielinska, A.J.; Noordermeer, Jacobus W.M.; Talma, Auke; Duin, Martin van

doi:10.5254/1.3577536

Cited by 3 publications

(2 citation statements)

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“…Therefore, the peak observed at about 240 °C in tan δ and loss modulus curves of XPU-A1 and corresponding increase of storage modulus could be related to the extra cross-linking of network originated from azide groups. Thermal degradation of azide groups, production of highly reactive nitrene (−N:) species, abstracting hydrogen atoms from aliphatic backbone of soybean oil, subsequent generation of carbon centered radial, and finally coupling of these radicals were considered as the main synthetic events occurring during extra cross-linking reactions. − …”

Section: Resultsmentioning

confidence: 99%

“…The weight loss at lower temperatures was attributed to thermal degradation of thermally labile azide moieties, , and the other weight losses at higher temperatures were related to thermal degradation of aliphatic hydrocarbon structure of the oil backbone. , Although low initial decomposition temperature was recorded for SP1, its overall rate of weight loss was also low. The generation of reactive nitrene species, − production of partially cross-linked soybean oil moieties, and damping of thermal energy by these extra bonds were responsible for the low thermal degradation rate of SP1. To confirm this hypothesis, TGA data of MSP were compared (Figure a,b).…”

Section: Resultsmentioning

confidence: 99%

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Polyurethane Coatings Derived from 1,2,3-Triazole-Functionalized Soybean Oil-Based Polyols: Studying their Physical, Mechanical, Thermal, and Biological Properties

et al. 2013

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Preparation of polyurethanes derived from novel 1,2,3triazole-functionalized soybean oil-based polyols and assessment of their possible biocidal activities were considered. Epoxidized soybean oil was reacted with sodium azide to produce an azide-containing polyol. The product was subjected to the cycloaddition reaction with various alkynes. Alkylation of tertiary amine-containing polyol with methyl iodide was also performed to prepare a quaternary ammonium salt (QAS)-containing polyol. The polyols and their mixtures with PEG1000 were reacted with isophorone diisocyanate to prepare polyurethane coatings. The influence of embedded functional groups on physical, mechanical, thermal and biological properties of polyurethanes was studied. Incorporation of 1,2,3-triazole groups within the polyol backbone resulted in higher storage modulus at glassy state, glass transition temperature, thermal stability and hardness of corresponding polyurethanes, while it led to lower adhesion strength and hydrophilicity. Although QAS-containing polyurethanes displayed better physical and mechanical properties, but their thermal stability were reduced. Studying the interaction of fibroblast cells with polyurethanes derived merely from oil-based polyols revealed their good cells viability (60− 110%). Moderate to high biocidal activity was detected for polyols and polyurethanes containing tertiary amine and QAS groups. Improving the hydrophilicity of polyurethanes via incorporation of PEG1000 improved their biocidal activity, while it reduced their cytocompatibility.

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Section: Resultsmentioning

confidence: 99%