scholarly journals Velcrand Functionalized Polyethylene

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 902
Author(s):  
Jonathan Tellers ◽  
Jérôme Vachon ◽  
Maria Soliman ◽  
Enrico Dalcanale ◽  
Roberta Pinalli
Keyword(s):  
Barrier Properties ◽  
Isocyanate Group ◽  
Hydroxyl Groups ◽  
Oxygen Barrier ◽  
Specific Class ◽  
Solution Casting ◽  
Slow Evaporation ◽  
Scanning Calorimetry ◽  
Free Hydroxyl ◽  
Poly Ethylene

Velcrands are a specific class of cavitands whose complementary surfaces induce self-dimerization. The insertion of a velcrand as physical cross-linking unit into a polymer is reported. To this purpose, the velcrand was functionalized at the lower rim with an isocyanate group. The functional velcrand was reacted with poly (ethylene-co-(2-hydroxethylmethacrylate)) (PE-HEMA), a polymer equipped with free hydroxyl groups suitable for reaction with the isocyanate group. The obtained functionalized polymer was characterized by nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR), proving the introduction of velcraplexes in the polymer. Films with varying amounts of velcrands were obtained by solution casting and slow evaporation, testifying the processability of the functionalized polymers. The obtained films were used to measure the oxygen barrier properties of the functionalized material.

Preparation of PAA/PEO blend nanofibers via electrospinning process

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Zahed Shami ◽  
Naser Sharifi-Sanjani
Keyword(s):  
Intermolecular Interactions ◽  
Average Diameter ◽  
Sem Analysis ◽  
Electrospinning Process ◽  
Hydroxyl Groups ◽  
Scanning Calorimetry ◽  
Absorption Bands ◽  
Dsc Measurements ◽  
Free Hydroxyl ◽  
Poly Ethylene

AbstractThe novel poly(acrylic acid)/poly(ethylene oxide) (PAA/PEO) blend nanofibers at 100/0, 80/20, 50/50, 20/80 and 0/100 weight ratios were obtained via electrospinning process. Intermolecular interactions and compatibility of blend fibers were studied by Fourier transform infrared (FT-IR) and differential scanning calorimetry (DSC). It was found that the free-hydroxyl groups, the bonded hydrogen hydroxyl groups and the carbonyl groups absorption bands in the electrospun PAA/PEO fibers shifted with the increase in PEO percentage in the blend. DSC measurements showed the melting point, the glass transition temperature, the melting enthalpy and the crystallinity percentage of pure polymer nanofibers were different compared with blend nanofibers. The results suggested that intermolecular interactions occurred in the electrospun PAA/PEO nanofibers. These interactions made PAA/PEO blends miscible at above-mentioned weight ratios. Additionally, the morphology and the average fiber diameter were investigated using scanning electron microscope (SEM) analysis, which indicated beadless fibers with diameter range of 110 to 280 nm. It was observed that the uniform fibers with the smaller average diameter were obtained in PAA/PEO blends containing PAA dominant content. Finally, the SEM results suggested that the formation of pure PAA nanofibers with concentration of 5 Wt. % would not occur. Whereas, in the same concentration, pure PEO and PAA/PEO blend nanofibers with no bead defects were obtained.

Poly(ethylene terephthalate) modified with aromatic bisester diamides: Thermal and oxygen barrier properties

2004 ◽  
Vol 42 (7) ◽  
pp. 1668-1681 ◽  
Author(s):  
Michael R. Hibbs ◽  
Jeremy Holtzclaw ◽  
David M. Collard ◽  
Richard Y. F. Liu ◽  
Anne Hiltner ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Barrier Properties ◽  
Oxygen Barrier ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Preparation and Characterization of Poly(ethylene-co-vinyl alcohol)/poly(ε-caprolactone) Blend for Bioscaffolding Applications

2020 ◽  
Vol 21 (16) ◽  
pp. 5881 ◽  
Author(s):  
Abdulaziz Ali Alghamdi ◽  
Hussain Alattas ◽  
Waseem Sharaf Saeed ◽  
Abdel-Basit Al-Odayni ◽  
Ali Alrahlah ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Vinyl Alcohol ◽  
Polymeric Materials ◽  
In Vitro Cytotoxicity ◽  
Hydroxyl Groups ◽  
Scanning Calorimetry ◽  
Reduced Pressure ◽  
Static Contact ◽  
Poly Ethylene

In order to improve the cell adhesion on poly(ε-caprolactone) (PCL) scaffolds, poly(ethylene-co-vinyl alcohol) (E-VAL) which has hydroxyl groups capable of developing hydrogen bonds with celling was blended with this polymer. To reach this goal, a series of E-VAL/PCL blends with different compositions were prepared by the solvent casting method. The miscibility of the polymer blend was proved by differential scanning calorimetry and Fourier-transform infrared spectroscopy spectrometry. Furthermore, the mechanical properties of the polymer blends were assessed in their wet state by dynamic mechanical analysis. The surfaces wettability of blends and their components were examined through static contact angle measurements. The pore interconnections in the resulted scaffolds were achieved by the incorporation of naphthalene microparticles which were used as porogen and then removed in its gas state by sublimation under reduced pressure. The presence of pores interconnected inside the polymeric materials and their surface morphologies was examined by scanning electron microscopy. The in-vitro cytotoxicity and cell adhesion on the prepared materials were examined by an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay.

scholarly journals Oxygen Barrier Properties and Melt Crystallization Behavior of Poly(ethylene terephthalate)/Graphene Oxide Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Anna Szymczyk ◽  
Sandra Paszkiewicz ◽  
Iwona Pawelec ◽  
Sławomir Lisiecki ◽  
Marek Jotko ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ethylene Terephthalate ◽  
Oxygen Permeability ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Oxygen Barrier ◽  
Melt Crystallization ◽  
Nonisothermal Crystallization ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Poly(ethylene terephthalate) nanocomposites with low loading (0.1–0.5 wt%) of graphene oxide (GO) have been prepared by usingin situpolymerization method. TEM study of nanocomposites morphology has shown uniform distribution of highly exfoliated graphene oxide nanoplatelets in PET matrix. Investigations of oxygen permeability of amorphous films of nanocomposites showed that the nanocomposites had better oxygen barrier properties than the neat PET. The improvement of oxygen permeability for PET nanocomposite films over the neat PET is approximately factors of 2–3.3. DSC study on the nonisothermal crystallization behaviors proves that GO acts as a nucleating agent to accelerate the crystallization of PET matrix. The evolution of the lamellar nanostructure of nanocomposite and neat PET was monitored by SAXS during nonisothermal crystallization from the melt. It was found that unfilled PET and nanocomposite with the highest concentration of GO (0.5 wt%) showed almost similar values of the long period (L=11.4 nm for neat PET andL=11.5 nm for PET/0.5GO).

scholarly journals Phosphonated Poly(ethylene terephthalate) Ionomers as Compatibilizers in Polyester/Polyamide Blends for Packaging Applications

2021 ◽  
Author(s):  
Lin Ju
Keyword(s):  
Ethylene Terephthalate ◽  
Oxygen Permeability ◽  
Barrier Properties ◽  
Oxygen Barrier ◽  
Poly Ethylene Terephthalate ◽  
Food And Beverage ◽  
Oxygen Sensitive ◽  
Polyester Matrix ◽  
Packaging Industry ◽  
Poly Ethylene

Poly(ethylene terephthalate) (PET) is widely used in the packaging industry. The oxygen barrier properties of PET are acceptable for many food and beverage products, but do not meet the stringent requirements for packaging highly oxygen-sensitive products. Blending PET with aromatic polyamides, such as poly(m-xylyene adipamide) (MXD6), reduces the inherent oxygen permeability of the polyester matrix. Due to the immiscibility of these two parent polymers, a compatibilizer is necessary to achieve an efficient and stable mixing

Improving oxygen barrier properties of poly(ethylene terephthalate) by incorporating isophthalate. I. Effect of orientation

2005 ◽  
Vol 98 (4) ◽  
pp. 1615-1628 ◽  
Author(s):  
R. Y. F. Liu ◽  
Y. S. Hu ◽  
M. R. Hibbs ◽  
D. M. Collard ◽  
D. A. Schiraldi ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Barrier Properties ◽  
Oxygen Barrier ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Oxygen-barrier properties of cold-crystallized and melt-crystallized poly(ethylene terephthalate-co-4,4?-bibenzoate)

2002 ◽  
Vol 40 (22) ◽  
pp. 2489-2503 ◽  
Author(s):  
Y. S. Hu ◽  
R. Y. F. Liu ◽  
M. Rogunova ◽  
D. A. Schiraldi ◽  
S. Nazarenko ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Barrier Properties ◽  
Oxygen Barrier ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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