Effect of aging on fractional crystallization of poly(ethylene oxide) component in poly(ethylene oxide)/poly(3-hydroxybutyrate) blends

2005 ◽  
Vol 43 (19) ◽  
pp. 2665-2676 ◽  
Author(s):  
Li Zhao ◽  
Weihua Kai ◽  
Yong He ◽  
Bo Zhu ◽  
Yoshio Inoue
Keyword(s):  
Ethylene Oxide ◽  
Fractional Crystallization ◽  
Oxide Component ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Poly(Ethylene Oxide)/Styrene Ionomers Blends: Crystallization of Poly (Ethylene Oxide) Component Studied by Wide-Angle X-Ray Diffraction

2007 ◽  
Vol 130 ◽  
pp. 251-256 ◽  
Author(s):  
Czesław Ślusarczyk ◽  
Kazimiera Suchocka-Gałaś
Keyword(s):  
Ethylene Oxide ◽  
Degree Of Crystallinity ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Component ◽  
Ionic Groups ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Degree Of Crystallinity

Wide-angle X-ray diffraction (WAXD) and the scanning electron microscopy (SEM) were used to determine the morphology of crystalline phase of blends of poly(ethylene-oxide) (PEO) and styrene-acrylic acid (S-AA) copolymers neutralized with sodium ions (Na+). In this study, we investigated the effects of blend composition and the content of ionic groups in amorphous ionomers on the degree of crystallinity and the crystallite sizes. It was found that the degree of crystallinity of PEO in the blends decreases both with increasing S-ANa(6.4) content and with increasing ANa content. The sizes of PEO crystallites, measured both in the direction perpendicular and parallel to the polymer axis, are almost independent of ionic groups content in the amorphous component of the blends but they decrease with increasing S-ANa(6.4) content. For the blends containing small amounts of PEO the confined crystallization of this polymer were observed. The final crystalline morphology of these blends, observed by SEM method, is different in comparison to that formed without spatial confinement.

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

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