Synthesis and Properties of Segmented Polyurethanes with Triptycene Units in the Soft Segment

• DOI: 10.1002/macp.201500024
• Publication Date: 2015-04-09T18:09:14Z
• Authors: Zhengmian Chang; Gregory B. Fahs; Amanda G. Hudson; E. Bruce Orler; Robert B. Moore; Garth L. Wilkes; S. Richard Turner
• Keywords: Triptycene; Hydroquinone; Isocyanate

Segmented polyurethanes based on poly(tetramethylene glycol) soft segments (SS) containing aromatic units are synthesized. Hydroquinone bis(2-hydroxyethyl) ether and 4,4′-methylenebis(phenyl isocyanate) used as the chain extender diisocyanate, respectively. Effects of incorporation hydroquinone (HQ) triptycene into morphology properties undeformed segmented investigated. Differential scanning calorimetry dynamic mechanical analysis indicate that leads to an increased glass transition temperature (Tg) elimination crystallization segments. The tensile shows there is no strain hardening for polymer films with triptycene-containing Wide-angle x-ray diffraction demonstrates absence in polyurethane likely arises from suppressed induced crystallization. In contrast, less bulky HQ show little effect either thermally or Morphology studies, including small angle scattering compression molded atomic force microscopy solvent cast film, reveal maintain distinct microphase separated morphology.