Abstract
Axial orientation of poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) films is achieved by stretching in a narrow temperature range (220–230 °C) close to the polymer glass-transition temperature (Tg). S...
Highlights
Poly(2,6-dimethyl-1,4-phenylene)oxide, abbreviated as PPO, is a high-performance commercial polymer, being generally amorphous and exhibiting a high glass-transition temperature (Tg ≈ 220 membrane °C), which material.[1−12] has been recognized as an effectivePPO crystallization has never been observed by melt processing
We report the axial stretching of PPO films, being amorphous or exhibiting NC α and β forms
The 2D pattern (Figure 1a) clearly shows that the broad amorphous halo becomes polarized in the equatorial region, with the degree of axial orientation increasing to 0.37
Summary
Poly(2,6-dimethyl-1,4-phenylene)oxide, abbreviated as PPO, is a high-performance commercial polymer, being generally amorphous and exhibiting a high glass-transition temperature (Tg ≈ 220 membrane °C), which material.[1−12] has been recognized as an effective. PPO CC phases can be divided into two well-separated classes: Class i exhibits a large crystal size and high perfection, which become amorphous after guest removal.[13−16,19] CC phases of class i are obtained only for a few selected guests (αpinene, decalin, and tetralin)[14−16,19] and include highly regular polymer helices (the 4/1 helix for the cocrystalline form with α-pinene).[19] Class ii exhibits a small crystal size and low perfection,[17,18] as generally typical of polymer crystals, and remains crystalline after suitable guest removal procedures.[20−27] CC phases of class ii are more interesting for possible industrial applications They can be achieved with a large number of guest molecules.[17,18] More relevantly, the crystalline phases obtained after guest removal from CC samples of this class are nanoporous-crystalline (NC) (i.e., their density is lower than for amorphous PPO).[20−27]. We report the axial stretching of PPO films, being amorphous or exhibiting NC α and β forms
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