Curing Kinetics of Tetrathiol-Crosslinked Diglycidyl ether of bisphenol A and Poly(ethylene oxide)diglycidylether

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.

Download Full-text

Effect of polyethylene glycol-grafted graphene on the non-isothermal crystallization kinetics of poly(ethylene oxide) and poly(ethylene oxide):lithium perchlorate electrolyte systems

Materials Research Bulletin ◽

10.1016/j.materresbull.2016.05.021 ◽

2016 ◽

Vol 83 ◽

pp. 24-34 ◽

Cited By ~ 9

Author(s):

Sepideh Gomari ◽

Ismaeil Ghasemi ◽

Masoud Esfandeh

Keyword(s):

Polyethylene Glycol ◽

Ethylene Oxide ◽

Crystallization Kinetics ◽

Isothermal Crystallization ◽

Lithium Perchlorate ◽

Isothermal Crystallization Kinetics ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Kinetics Of

Download Full-text

Nanostructure and crystallisation kinetics of poly(ethylene oxide)/poly(4-vinylphenol-co-2-hydroxyethyl methacrylate) blends

Polymer ◽

10.1016/j.polymer.2005.08.100 ◽

2005 ◽

Vol 46 (26) ◽

pp. 12493-12502 ◽

Cited By ~ 13

Author(s):

Robson Pacheco Pereira ◽

Ana Maria Rocco

Keyword(s):

Ethylene Oxide ◽

Hydroxyethyl Methacrylate ◽

Crystallisation Kinetics ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Kinetics Of

Download Full-text

Physical Gels Based on Polyrotaxanes: Kinetics of the Gelation, and Relative Contributions of α-Cyclodextrin and Poly(ethylene oxide) to the Gel Cohesion

Macromolecular Symposia ◽

10.1002/masy.201050524 ◽

2010 ◽

Vol 291-292 (1) ◽

pp. 202-211 ◽

Cited By ~ 4

Author(s):

Christophe Travelet ◽

Guy Schlatter ◽

Pascal Hébraud ◽

Cyril Brochon ◽

Denis V. Anokhin ◽

...

Keyword(s):

Ethylene Oxide ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Kinetics Of

Download Full-text

Fabrication and Properties of High-Content Keratin/Poly (Ethylene Oxide) Blend Nanofibers Using Two-Step Cross-Linking Process

Journal of Nanomaterials ◽

10.1155/2015/803937 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Yong Liu ◽

Xia Yu ◽

Jia Li ◽

Jie Fan ◽

Meng Wang ◽

...

Keyword(s):

Ethylene Oxide ◽

Average Diameter ◽

Diglycidyl Ether ◽

Cross Linking ◽

Electrospun Fibers ◽

Hydrophobic Property ◽

Poly Ethylene Oxide ◽

Cross Linker ◽

Poly Ethylene ◽

Nanofiber Mats

High-content keratin/poly (ethylene oxide) (PEO) (90/10) blend nanofibers were prepared by electrospinning combined with a two-step cross-linking process. The keratin/PEO aqueous solution was firstly mixed with ethylene glycol diglycidyl ether (EGDE) as cross-linker and then electrospun into nanofibers. The resulting nanofibrous mats were cross-linked with EGDE vapor to decrease the solubility of nanofibers in water. The morphologies and properties of electrospun fibers were investigated by SEM, FTIR, TG, XRD, and contact angle testing, respectively. The results showed that the morphologies of nanofibers were uniform at the fiber average diameter of 300 nm with negligible bead defects by adding EGDE to keratin/PEO solutions. The cross-linking results showed that EGDE vapor could improve the hydrophobic property of blended nanofibers. The crystallinity of the keratin/PEO blend nanofiber mat increased from 13.14% for the uncross-linked sample to 21.54% and 35.15% for the first cross-linked and second cross-linked samples, respectively. Free defect nanofiber mats with high keratin content producing from this two-step cross-linking process are particularly promising for tissue engineering and cell-seeded scaffold.

Download Full-text