Phase Separation in Silica Sol–Gel System Containing Poly(ethylene oxide). I. Phase Relation and Gel Morphology

1994 ◽  
Vol 67 (10) ◽  
pp. 2898-2898
Keyword(s):  
Phase Separation ◽  
Ethylene Oxide ◽  
Phase Relation ◽  
Sol Gel ◽  
Silica Sol ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Gel System

scholarly journals Microstructure and Mechanical/Elastic Performance of Biobased Poly (Butylene Furanoate)–Block–Poly (Ethylene Oxide) Copolymers: Effect of the Flexible Segment Length

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 271 ◽  
Author(s):  
Magdalena Kwiatkowska ◽  
Inez Kowalczyk ◽  
Konrad Kwiatkowski ◽  
Agata Zubkiewicz
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Ethylene Oxide ◽  
Mechanical Performance ◽  
Elastic Recovery ◽  
Segment Length ◽  
Poly Ethylene Oxide ◽  
Injection Molded ◽  
Poly Ethylene ◽  
Flexible Segment

The aim of this paper is to extend knowledge on biobased poly(butylene furanoate)–block–poly (ethylene oxide) (PBF-b-PEO) copolymers’ performance by studying the effect of the PEO segment’s molecular weight on the microstructure and materials behavior. As crystallization ability of PEO depends on its molecular weight, the idea was to use two PEO segment lengths, expecting that the longer one would be able to crystallize affecting the phase separation in copolymers, thus affecting their mechanical performance, including elasticity. Two series of PBF-block-PEOs with the PEO segments of 1000 and 2000 g/mol and different PBF/PEO segment ratios were synthesized by polycondensation in melt, injection molded to confirm their processability, and subjected to characterization by NMR, FTIR, DSC, DMTA, WAXS, TGA, and mechanical parameters. Indeed, the PEO2000 segment not only supported the crystallization of the PBF segments in copolymers, but at contents at least 50 wt % is getting crystallizable in the low temperature range, which results in the microstructure development and affects the mechanical properties. While the improvement in the phase separation slightly reduces the copolymers’ ability to deformation, it is beneficial for the elastic recovery of the materials. The investigations were performed on the injection molded samples reflecting the macroscopic properties of the bulk materials.

Analysis of phase separation behaviour in the system poly(ethylene oxide)-water

1987 ◽  
Vol 29 (3) ◽  
pp. 709-714 ◽  
Author(s):  
V.I Klenin ◽  
N.K Kolnibolotchuk ◽  
N.A Solonina ◽  
Yu.F Ivanyuta ◽  
N.I Panina
Keyword(s):  
Phase Separation ◽  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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