based polymers derived from thermal rearrangement (TR) and ... | 食品添加物合法業者資訊網

由SLuo著作·2016·被引用45次—Preparationandgastransportpropertiesoftriptycene-containingpolybenzoxazole(PBO)-basedpolymersderivedfromthermalrearrangement(TR)andthermal ...

Polybenzoxazoles (PBOs), such as thermally rearranged (TR) polymers, have been shown to have excellent gas separation performance. Herein we report the preparation and transport properties of two new series of PBO-based polymers that were thermally derived from triptycene-containing o-hydroxy polyimide and polyamide precursors via a thermal rearrangement (TR) process and a thermal cyclodehydration (TC) process, respectively. Incorporation of triptycene units into poly(hydroxyimide) precursor structures led to a significant increase of fractional free volume and created ultrafine microporosity in the converted PBO-based TR polymers, which enabled both high gas permeabilities and high selectivities. Although the TC process of the poly(hydroxyamide) precursor led to moderate improvement in the separation performance of the resulting triptyc...