Polyurethane elastomer–silica hybrid films based on oxytetramethylene soft segments: thermal and thermo-mechanical investigations

Omidi-Ghallemohamadi, Mehrdad; Jafari, P.; Behniafar, Hossein

doi:10.1007/s10965-021-02466-5

Cited by 1 publication

(2 citation statements)

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“…Figure S7A –D exhibit one step of degradation for all composite materials, and it occurs in the same interval of temperature (270–457 °C). This phenomenon could be explained by the degradation of starches that takes place between 260–400 °C [ 60 ], followed by the decomposition of polyurethane that happens between 310–380 °C [ 61 ]. The degradation of polyurethane occurs principally in three steps.…”

Section: Resultsmentioning

confidence: 99%

“…The temperature at which the maximum rate of degradation (Tmax) occurs (as reported in Table 2 ) did not show a statistically significant difference between polyurethane matrices with and without the inclusion of fillers (AL-N and AL-Z). Thus, the addition of starches in polyurethane matrices does not affect their thermal stability [ 60 , 61 ]. These results are consistent with the investigation carried out by Swamy et al [ 60 ], who used starch as a filler, with starch loading concentrations of 5–25% in polymeric matrices, and concluded that the thermal stability of composites was not affected.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Starch on the Structure–Properties Relationship in Polyethylene Glycol/Polycaprolactone Diol Polyurethanes

2022

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Improvements in the antithrombogenicity activity of biomaterials for cardiovascular applications are necessary to meet the demand for vascular grafts in the world. Zwitterionic compounds tend to be used due to their anti-fouling properties, which reduce platelet adhesions and protein absorptions. Therefore, in this research, potato starch (AL-N) and zwitterionic starch (AL-Z) (obtained by Williamson etherification) were included as fillers in polyurethane (PU) matrices from polycaprolactone diol (PCL), polyethylene glycol (PEG), pentaerythritol (PE) and isophorone diisocyanate (IPDI) in order to study their effect in terms of their physicochemical, mechanical and thermal properties. We conducted our evaluation using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), contact angle analysis, swelling behavior, thermogravimetric analysis (TGA), tensile/strain analysis, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS), dynamic mechanic analysis (DMA), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The results showed that AL-N and AL-Z modified these properties, where AL-N improved tensile strength, and AL-Z increased the hydrophilicity of polyurethanes matrices; additionally, AL-N had interactions with the soft segments, and AL-Z had interactions with the hard segments. Finally, both fillers reduced the degree of crystallinity and did not affect the thermal stability of polyurethanes.

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Section: Resultsmentioning

confidence: 99%