Covalent immobilization of PEI on PE-AlSiO 2 using 3-glycidoxypropyltrimethoxysilane (GPS) or 3-triethoxysilylpropyl isocyanate (TPI) as a grafting agent and Et 3 N or NaOH as a catalyst was investigated. Compared to traditional PEI impregnation, covalently immobilized PEI using TPI and NaOH retained the most CO 2 following oxidative degradation at 100 °C for up to 40 h and leaching in EtOH for 2 h. Further modification of PEI with 1,2-epoxybutane led to further enhancement in oxidation stability.
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Kolle et al. (2019) studied this question.
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