Acceleration of Crystal Growth of Amorphous Griseofulvin by Low-Concentration Poly(ethylene oxide): Aspects of Crystallization Kinetics and Molecular Mobility

2017 ◽  
Vol 14 (7) ◽  
pp. 2262-2272 ◽  
Author(s):  
Qin Shi ◽  
Chen Zhang ◽  
Yuan Su ◽  
Jie Zhang ◽  
Dongshan Zhou ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Ethylene Oxide ◽  
Crystallization Kinetics ◽  
Molecular Mobility ◽  
Low Concentration ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Selective Acceleration of Crystal Growth of Indomethacin Polymorphs by Low-Concentration Poly(ethylene oxide)

2017 ◽  
Vol 14 (12) ◽  
pp. 4694-4704 ◽  
Author(s):  
Qin Shi ◽  
Jie Zhang ◽  
Chen Zhang ◽  
Jing Jiang ◽  
Jun Tao ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Ethylene Oxide ◽  
Low Concentration ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Isothermal Crystallization Kinetics of Poly(ethylene oxide)/Poly(ethylene glycol)-g-silica Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 648
Author(s):  
Xiangning Wen ◽  
Yunlan Su ◽  
Shaofan Li ◽  
Weilong Ju ◽  
Dujin Wang
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Crystallization Rate ◽  
Poly Ethylene Glycol ◽  
Isothermal Crystallization Kinetics ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Kinetics Of

In this work, the crystallization kinetics of poly(ethylene oxide) (PEO) matrix included with poly(ethylene glycol) (PEG) grafted silica (PEG-g-SiO2) nanoparticles and bare SiO2 were systematically investigated by differential scanning calorimetry (DSC) and polarized light optical microscopy (PLOM) method. PEG-g-SiO2 can significantly increase the crystallinity and crystallization temperature of PEO matrix under the non-isothermal crystallization process. Pronounced effects of PEG-g-SiO2 on the crystalline morphology and crystallization rate of PEO were further characterized by employing spherulitic morphological observation and isothermal crystallization kinetics analysis. In contrast to the bare SiO2, PEG-g-SiO2 can be well dispersed in PEO matrix at low P/N (P: Molecular weight of matrix chains, N: Molecular weight of grafted chains), which is a key factor to enhance the primary nucleation rate. In particular, we found that the addition of PEG-g-SiO2 slows the spherulitic growth fronts compared to the neat PEO. It is speculated that the interfacial structure of the grafted PEG plays a key role in the formation of nuclei sites, thus ultimately determines the crystallization behavior of PEO PNCs and enhances the overall crystallization rate of the PEO nanocomposites.

Poly(ethylene) oxide for small-molecule crystal growth in gelled organic solvents

2011 ◽  
Vol 44 (1) ◽  
pp. 172-176 ◽  
Author(s):  
Duane Choquesillo-Lazarte ◽  
Juan Manuel García-Ruiz
Keyword(s):  
Crystal Growth ◽  
Ethylene Oxide ◽  
Small Molecules ◽  
Organic Solvents ◽  
Small Molecule ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The use of poly(ethylene) oxide (PEO) as a gelator has been evaluated with a selected list of organic solvents. From the 26 solvents tested, eight formed gel matrices. This number was extended to 19 when poly(ethylene) oxide was used with a mixture of solvents. The procedure for the preparation of PEO organogels is described, and their application for the crystallization of small molecules using different crystallization techniques in the presence of organic solvents is discussed.

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