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Diamond nanoparticles/urethane-based bio-adhesives (ND-U-BA) were synthesized via in-situ polymerization. Chemical structure and curing kinetics of the samples were studied by Fourier-transform infrared spectroscopy. Results showed NDs controlled the curing profile of samples. Thermal and crystalline properties were studied using differential scanning calorimetry and X-ray diffraction analyses. Results indicated hard segments had higher ordering levels in the presence of NDs which is due to the lower hydrogen bonding among polyurethane chains. Mechanical results showed ND-U-BA had higher adhesion strength due to the formation of chemical crosslinks and a controlled curing mechanism. MTT and biodegradation studies showed ND-U-BA had acceptable cell viability and degradation content. • Urethane and diamond nanoparticles/urethane-based bio-adhesives were synthesized. • Results showed ND nanoparticles had controlling effect on curing kinetic of samples. • Cell viability of bio-adhesives was improved with the ND nanoparticles' addition. • Incorporation of ND nanoparticles increased the adhesion strength of bio-adhesive. [ABSTRACT FROM AUTHOR]

Thermoplastic elastomer polyurethanes (TEPUs) were synthesized for orthodontic ligature application and the relationship between various properties and structure of the synthesized TEPUs were studied. Polyethylene glycol and 1,4-butanediol were utilized in various weight ratios as chain extender. Fourier-transform infrared spectroscopy, differential scanning calorimetry, and X-ray diffraction were used to study the chemical and physical properties and also, tensile, stress relaxation, and elasticity analysis were performed to evaluate the mechanical properties of the prepared samples. Shape memory and stress relaxation analysis with temperature variation showed that the samples could recover the relaxed force due to the shape memory capability. [ABSTRACT FROM AUTHOR]