Bao Ming, Liu Tianyu, Tao Ying, Ni Xiuyuan
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.
Polymers (Basel). 2024 Aug 28;16(17):2438. doi: 10.3390/polym16172438.
For probing the structure-property relationships of the polyurea elastomers, we synthesize the siloxane polyurea copolymer elastomer by using two aminopropyl-terminated polysiloxane monomers with low and high number-average molecular weight (), i.e., L-30D and H-130D. To study the influence of the copolymer structures on the film properties, these films are analyzed to obtain the tensile performance, UV-vis spectra, cross-sectional topographies, and glass transition temperature (T). The two synthetic thermoplastic elastomer films are characterized by transparency, ductility, and the T of the hard domains, depending on the reacting compositions. Furthermore, the film elasticity behavior is studied by the strain recovery and cyclic tensile test, and then, the linear fitting of the tensile data is used to describe the film elasticity based on the Mooney-Rivlin model. Moreover, the temperature-dependent infrared (IR) spectra during heating and cooling are conducted to study the strength and recovery rate of the hydrogen bonding, respectively, and their influence on the film performance is further analyzed; the calculated of the hard segment chains is correlated to the macroscopic recovery rate of the hydrogen bonding. These results can add deep insight to the structure-property relationships of the siloxane polyurea copolymer.
为了探究聚脲弹性体的结构-性能关系，我们使用两种具有低和高数均分子量（）的氨丙基封端的聚硅氧烷单体，即L-30D和H-130D，合成了硅氧烷聚脲共聚物弹性体。为了研究共聚物结构对薄膜性能的影响，对这些薄膜进行了分析，以获得拉伸性能、紫外-可见光谱、横截面形貌和玻璃化转变温度（T）。这两种合成热塑性弹性体薄膜的特点是具有透明度、延展性以及硬段的T，这取决于反应组成。此外，通过应变恢复和循环拉伸试验研究了薄膜的弹性行为，然后，基于Mooney-Rivlin模型，使用拉伸数据的线性拟合来描述薄膜弹性。此外，分别进行加热和冷却过程中与温度相关的红外（IR）光谱研究，以研究氢键的强度和恢复率，并进一步分析它们对薄膜性能的影响；计算得到的硬段链的与氢键的宏观恢复率相关。这些结果可以为硅氧烷聚脲共聚物的结构-性能关系提供更深入的见解。
