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Open AccessArticle

Axial Orientation of Co-Crystalline Phases of Poly(2,6-Dimethyl-1,4-Phenylene)Oxide Films

Chemistry and Biology Department, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
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Polymers 2020, 12(10), 2394; https://doi.org/10.3390/polym12102394
Received: 31 August 2020 / Revised: 12 October 2020 / Accepted: 15 October 2020 / Published: 17 October 2020
(This article belongs to the Section Polymer Physics)
Films exhibiting co-crystalline (CC) phases between a polymer host and low-molecular-mass guest molecules are relevant for many applications. As is usual for semi-crystalline polymers, axially oriented films can give relevant information on the crystalline structure, both by Wide Angle X-ray diffraction fiber patterns and by polarized Fourier-transform infrared spectroscopy. Axially oriented CC phases of poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) with 1,3,5-trimethylbenzene (mesitylene) can be simply obtained by the stretching of CC PPO films. In fact, due to the plasticization effect of this highly boiling guest, PPO orientation can occur in a stretching temperature range (170–175 °C) nearly 50 °C lower than that generally needed for PPO films (220–230 °C). This low stretching temperature range allows avoidance of polymer oxidation, as well as formation of the mesomorphic dense γ PPO phase. Axially oriented CC phases of PPO with toluene, i.e., with a more volatile guest, can be instead obtained by the stretching (in the same low temperature range: 170–175 °C) of CC PPO blend films with polystyrene. View Full-Text
Keywords: α form; nanoporous-crystalline; WAXD; polarized FTIR; host-guest orientation; toluene; mesitylene; poly(2,6-dimethyl-1,4-phenylene)oxide; atactic polystyrene α form; nanoporous-crystalline; WAXD; polarized FTIR; host-guest orientation; toluene; mesitylene; poly(2,6-dimethyl-1,4-phenylene)oxide; atactic polystyrene
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MDPI and ACS Style

Golla, M.; Nagendra, B.; Daniel, C.; Rizzo, P.; Guerra, G. Axial Orientation of Co-Crystalline Phases of Poly(2,6-Dimethyl-1,4-Phenylene)Oxide Films. Polymers 2020, 12, 2394.

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