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用顺磁共振波谱仪(ESR),以4-羟基-2,2,6,6-四甲基哌啶嗣(TEMPOL)作自旋标记,测定了不同组成及不同温度聚醚聚氨酯/聚甲基丙烯酸甲酯(PU/PMMA)互穿网络聚合物(IPN,S)的分子运动与互穿缠结程度的关系。实验结果表明:在该IPN中两网络互穿缠结程度越大,在高场上出现各向同性温度T_n越高。当PU/PMMA=40/60时,得到较大交联密度和较高温度的T_n。由测得的T_(50G)温度看出该体系是两相分离体系,并且不同组成比的IPN两个T_(50G)温度发生内移,在40/60时内移最大,用动态力学方法测得的结果与此一致。
Using spin-polarized magnetic resonance spectroscopy (ESR) with 4-hydroxy-2,2,6,6-tetramethylpiperidinium (TEMPOL) as spin label, the effects of different compositions and temperatures of polyether polyurethane / Relationship between Molecular Motions and Interpenetrating Entanglement Degree of Poly (methyl methacrylate) (PU / PMMA) Interpenetrating Polymer Networks (IPN, S). The experimental results show that the greater the degree of interpenetrating intertwining in the IPN, the higher the isotropic temperature T_n appears in the high field. When PU / PMMA = 40/60, T_n with larger crosslink density and higher temperature was obtained. From the measured T_ (50G) temperature, the system is a two-phase separation system, and the two T_ (50G) temperatures of the IPNs with different composition ratios are shifted inwards, and the maximum shifts within 40/60 hours. Dynamic mechanical method The result is the same.