The impact of electron beam irradiation on thermoplastic polyurethane material was studied for both an aliphatic and an aromatic polyurethane with approximately equal molar amount of hard and soft segments. Irradiation doses up to 300 kGy (kilogray) at room temperature and at 100°C were applied. Changes in chemical structure, molar mass and size were assessed using infrared spectroscopy, differential scanning calorimetry, size exclusion chromatography and thermal field-flow fractionation. Material alterations were correlated with trends regarding to degradation, crosslinking or branching changes. Thereby, limits of characterization by size exclusion chromatography are addressed and amended by thermal field-flow fractionation studies. In addition, a thermophoretic analysis has been carried out complementary to the portfolio of analytical methods applied in this work.

对于硬和软链段摩尔量相等的脂族和芳族聚氨酯，均研究了电子束辐照对热塑性聚氨酯材料的影响。在室温和100°C时的辐照剂量最高为300 kGy（kilogray）。使用红外光谱，差示扫描量热法，尺寸排阻色谱法和热场流分馏法评估化学结构，摩尔质量和大小的变化。物质变化与有关降解，交联或分支变化的趋势相关。因此，通过尺寸排阻色谱法表征的限制已得到解决，并通过热场流分馏研究进行了修正。此外，