Effect of electron beam irradiation on the properties of poly(tetramethylene oxide) and a poly(tetramethylene oxide)-based polyurethane

Impact of Electron Beam Irradiation on Thermoplastic Polyurethanes Unraveled by Thermal Field-Flow Fractionation

“…2,51 Up to now, molar mass characterization of irradiated TPU is frequently carried out by SEC but mainly on the basis of relative calibration by polymer standards of narrow dispersity. 16,65,72,73 However, particular fractions of branched polymers tend to elute not just according to their size, as it is expected for entropy mode elution. Fractions containing long chain branches may elute delayed as a consequence of anchoring effects of branches with the column packing material.…”

“…In a recent study to electron beam irradiation of aromatic TPU chain scission or branching is reported to assumedly prevail over possible crosslinking reaction. 65 However, for thorough understanding of the observed effects in the material investigated in this work with regard to irradiation dose and temperature a comprehensive, separation-based molar mass, size and conformation characterization is needed.…”

Fabrication of Biomedical Scaffolds Using Biodegradable Polymers

“…A study by Navarro et al found that e-beam sterilization significantly affected the mechanical properties of poly­(tetrahydrofuran) by causing chain scission in the amorphous phase. These alterations included a decreased stress at break and strain at break at low doses and a decreased Young’s modulus, strain and tensile strength at high doses . Conversely, a study by Rynkevic et al found that e-beam sterilization had no significant effect on ureido-pyrimidinone-PCL meshes, although e-beam radiation has been found to cause cross-linking, chain scission, and increased elasticity modulus in polycaprolactones. , …”